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Friday, 5 July 2013

JAVA INTERVIEW QUESTIONS

    What is internationalisation? How can you achieve in java?    
   
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    What does the "abstract" keyword mean in front of a method? A class?    
   
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    What is the difference between instanceof and isInstance?    
   
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    Is java a fully object oriented programming or not? if not why?    
   
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    Which Java operator is right associative?    
   
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    Addition of two numbers using Bitwise operators. Reading An 2D array using single for loop    
   
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    Why we can not override static method?    
   
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    How can we write our own arraylist without using collections?    
   
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    Which class is extended by all other classes?    
   
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    How will you perform transaction using JDBC    
   
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    What is the default size of vector and StringBuffer?    
   
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    Can we serialize the static variable?    
   
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    Meaning - Abstract classes, abstract methods    
   
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    Explain Garbage collection mechanism in Java    
   
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    What is the difference between interface and abstract class ?    
   
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    Given A = 1, B = 2, C = 3, D = 4 ?? Z = 26, write a java standalone program to encode the word ?TELEPHONE? into numbers.    
   
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    What is Weak reference and Soft reference in java?    
   
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    What is the difference between length and length() ?    
   
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    What are the main differences between Java and C++?    
   
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    can we declare multiple main() methods in multiple classes.ie can we have each main method in its class in our program?    
   
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    can we declare multiple main() methods in multiple classes.ie can we have each main method in its class in our program?    
   
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    What is difference between & and && in java    
   
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    what is skeleton in java or J2EE??????    
   
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    What is package? Define with example?    
   
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    Can we override Thread's run() method?    
   
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    What is the difference between exception and error?    
   
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    What is JDBC? Describe the steps needed to execute a SQL query using JDBC.    
   
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    Access specifiers: "public", "protected", "private", nothing?    
   
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    How will you pass values from HTML page to the Servlet?    
   
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    Why java is not pure object oriented language?    
   
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    Explain Java security model    
   
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    What is the difference between an if statement and a switch statement?    
   
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    Why do we call java until.* package as a framework.    
   
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    Have you ever used HashTable and Dictionary?    
   
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    What restrictions are placed on method overloading?    
   
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    What are the differences between JIT and HotSpot    
   
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    Give example of : High severity & Low priority    
   
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    Explain RMI Architecture?    
   
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    Explain working of Java Virtual Machine(JVM).    
   
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    Can I execute or call one applet from another applet? If so then how??? Please Reply me... Thanks

    What is the difference between Java and J2EE? Is J2EE advanced version of Java?    
   
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    Difference: Java Beans, Servlets    
   
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    Does java support Line by Line execution?    
   
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    How to make a class or a bean serializable?    
   
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    Can a double value be cast to a byte?    
   
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    What is the differences between script language and programming language?    
   
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    What do mean by polymorphism, inheritance, encapsulation?    
   
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    1)What are the actual functions of JVM? 2)When to use a class and when to use an Abstract class? 3)what is the use of constructors other than creation of objects? 4)when to use constructors? 5)when to use Interface? 6)why java does not support pointers? 7)why multiple inheritance is not possible in java without using Interfaces?    
   
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    Does Java have destructors?    
   
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    can the main() method be overloaded? or overrided? and what happens when we do so?    
   
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    What is the difference between Applet and japplet? What are the traverses in binary tree? Write down how will you create a Binary tree? What is constructor and virtual function? Can we call a virtual function in a constructor? give example.    
   
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    What is the disadvantage of threads?    
   
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    If interface has got four methods,and I like to implement only two methods, how this could be achieved?    
   
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    Java says "write once, run anywhere". What are some ways this isn't quite true?    
   
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    Difference between Applet and JApplet    
   
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    What is cohesion and coupling in java?    
   
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    What is the difference between List, Set and Map    
   
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    What is the purpose of the Runtime class?    
   
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    Why ArrayList is faster than Vector?    
   
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    String class can be extendable? and why?
    Why JAVA not support multiple inheritance? How can we pass address of an object?    
   
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    What is the difference between Iterator and Enumeration?    
   
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    What are the disadvantages of using threads?    
   
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    While developing one in JSP page we are sending request to Struts frame work.If we click two times submit button then First time only it should accept request and second time should reject that request in struts frame work. How we can do that in controller itself...I am waiting for your Response...    
   
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    In a large-scale multi-threaded environment, how might you organise access to a shared resource (such as a database connection)?    
   
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    Why there are some null interface in java. What does it mean. Give me some null interfaces in JAVA?    
   
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    Advantages of Implementing Runnable over extending Thread    
   
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    What is the functionality stubs and skeletons?    
   
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    Why we use OOPS concepts, What is its advantage?    
   
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    What is meant by static query and dynamic query?    
   
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    What it the root class for all Java classes?    
   
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    How Linkedlist can be implemeented in java with out using collection framework?    
   
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    How many different types of JDBC drivers are present? Discuss them.    
   
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    Why Java is case sensitive?    
   
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    How to make application thread-safe ?    
   
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    What is the mapping mechanism used by Java to identify IDL language?    
   
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    How many methods do u implement if implement the Serializable Interface?    
   
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    What is the difference between the Boolean & operator and the && operator?    
   
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    How will you call an Applet using a Java Script function?    
   
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    What is the difference between InputStream/Outputstream classes?

    How will you call an Applet using a Java Script function?    
   
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    How many methods do u implement if implement the Serializable Interface?    
   
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    How System.out.println() works?    
   
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    Why Java is not 100% pure object oriented language?    
   
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    What is the abstraction? Give example?    
   
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    What gives java it's "write once and run anywhere" nature?    
   
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    can we write return statement in try catch or finally block. suposse we write return 0 in try catch or finally. can we do.    
   
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    How hashtable is synchronized?why hashmap is not synchronized?Can we make hashmap synchronized?    
   
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    What is the difference between hiding & overriding ?    
   
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    What state does a thread enter when it terminates its processing?    
   
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    What is meant by distributed Application. Why we are using that in our applications?    
   
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    Explain Servlet and JSP life cycle    
   
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    Describe java's security model.    
   
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    What is the difference between concat and append?    
   
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    What is the difference between Serializalble and Externalizable interface?    
   
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    How many times may an object's finalize() method be invoked by the garbage collector?    
   
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    Solve it... public class test { public static void main(String[] args) { int i=5; i=i++; System.out.println("result::"+i); } }    
   
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    What is the difference between Comparable and Comparator    
   
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    In Java, You can create a String object as: String str = "abc"; & String str = new String("abc"); Why cant a button object be created as : Button bt = "abc" Why is it compulsory to create a button object as: Button bt = new Button("abc"); Why is this not compulsory in String's case?    
   
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    What is the difference between C++ & Java
    When we are sending the serialized array object thro the network, what is being passed ? is the value or the reference ?    
   
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    What is Singleton class?    
   
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    What modifiers may be used with a top-level class?    
   
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    what is the first statement in construtor?    
   
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    What is meant by cookies? Explain.    
   
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    What is the webserver used for running the Servlets?    
   
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    What is the meaning of "final" keyword?    
   
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    What is the immediate superclass of the Applet class?    
   
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    What class allows you to read objects directly from a stream?    
   
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    What is the difference between RMI & Corba?    
   
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    What is reflection API? How are they implemented    
   
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    How to use C++ code in Java Program?    
   
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    Can try statements be nested?    
   
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    How do you know that where to use abstract class or interface?    
   
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    What are interfaces?    
   
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    Does garbage collection guarantee that a program will not run out of memory?    
   
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    What value does read() return when it has reached the end of a file?    
   
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    Can you invoke the methods on a Thread once it is stopped?    
   
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    why java does not support inheritance of multiple superclasses? what is achieved by inheritance? why there is no main method in servlets/jsps?    
   
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    What is the use of unicast remote object
    How would you implement a thread pool    
   
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    How to use JNI in java? and what are Struts and jini?and how to apply native code in java?    
   
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    Connecting to a Database and Strings Handling?    
   
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    How do you download stubs from a Remote place?    
   
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    Can a lock be acquired on a class?    
   
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    Explain the importance of "static"keyword    
   
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    IBM Interview Questions in Bangalore    
   
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    Why do you create interfaces, and when MUST you use one?    
   
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    What method must be implemented by all threads?    
   
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    What is the priority of main thread in java?? and why??    
   
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    What does the keyword "synchronize" mean in java. When do you use it? What are the disadvantages of synchronization?    
   
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    Does a class inherit the constructors of its superclass?    
   
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    What is the basic difference between Java and .Net    
   
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    What are the main differences between jdk1.4 , jdk1.5 & jdk1.6?    
   
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    What is the difference between interrupt() and join() in threads?Give an example program?    
   
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    What is the difference between a break statement and a continue statement    
   
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    How will you communicate between two Applets?    
   
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    Why we have used to in main method in JAVA this words 1)public 2)static 3)void 4)main 5)(String args[])    
   
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    What is Anonymous class,Singleton Class and Assertions?    
   
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    What is synchronization and why is it important?
    How are this() and super() used with constructors?    
   
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    What are the tiers in J2EE architecture?    
   
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    What are the advantages of OOPL?    
   
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    Which Collection class is used for FIFO in Java    
   
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    When to use Interface over abstract class?    
   
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    What event results from the clicking of a button?    
   
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    What is meant by class loader. How many types are there. When will we use them?    
   
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    Can a lock be acquired on a class?    
   
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    Why default constructor of base class will be called first in java?    
   
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    Can we add Hashtable/HashMap to a vector?    
   
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    How does thread synchronization occurs inside a monitor?    
   
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    Differences between HashList and HashMap, Set and List    
   
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    When is the finally clause of a try-catch-finally statement executed?    
   
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    What restrictions are placed on method overriding?    
   
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    Can I create final executable from Java?    
   
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    What do you mean by virtual methods?    
   
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    How to create own Marker Interface with example    
   
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    Strings are immutable.But String s="Hello"; String s1=s+"World"; S.O.P(s1); means printing "HelloWorld".How ?    
   
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    When a thread blocks on I/O, what state does it enter    
   
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    What is Constructor and Virtual function. Can we call Virtual funciton in a constructor?
    Can an exception be rethrown?    
   
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    What's the difference between the == operator and the equals() method? What test does Object.equals() use, and why?    
   
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    Describe, in general, how java's garbage collector works?    
   
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    What is the difference between Grid and GridbagLayout?    
   
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    Solve it... public class test { public static void main(String[] args) { int i=5; i=i++; System.out.println("result::"+i); } } The result wil be 5..!! and not 6 why???    
   
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    Why java does not support multiple inheritance.why we go for interfaces    
   
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    How can you achieve Multiple Inheritance in Java?    
   
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    what is the definition of arraylist? plz write in brief.    
   
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    Can a Byte object be cast to a double value?    
   
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    What class is the top of the AWT event hierarchy?    
   
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    How should I start learning Advanced Java? Which books to refer ???    
   
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    What is super class of an Exception class?    
   
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    How many methods in the Serializable interface?    
   
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    What is the difference between CGI and Servlet?    
   
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    Compare SWING components to standard AWT.    
   
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    What is the difference between paint() and repaint() methods?    
   
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    Why "bytecode"? Can you reverse-engineer the code from bytecode?    
   
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    What is the main difference between access modifiers and access specifiers?    
   
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    Explain RMI Architecture    
   
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    Give me the example of how in real life example Thread is used...
    How do you load an Image in a Servlet?    
   
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    Why the multiple inheritance is not possible in java and if possible HOW??    
   
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    Can we make construtor STATIC?    
   
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    What is final method?    
   
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    Why multiple inheritance using classes is disadvantage in java    
   
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    Explain the keywords - native, transient, volatile, finally    
   
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    What is it reflection (introspection) ? Why is reflection possible in the Java language?    
   
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    Why pointers are not used in java?    
   
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    In Java, You can create a String object as: String str = "abc"; & String str = new String("abc");Why    
   
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    What are three ways in which a thread can enter the waiting state?    
   
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    Why java does not support Multiple Inheritance?    
   
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    Diff between ArrayList and Vector?    
   
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    What are the main features of java and c++?    
   
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    How is it possible for two String objects with identical values not to be equal under the ==operator?    
   
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    What is use of JVM?    
   
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    What are the advantages of developing an n-tiered system?    
   
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    What is the diff.between JDK 1.4 and JDK 5.0?    
   
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    Can the abstract class be final?    
   
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    How is it possible for two String objects with identical values not to be equal under the == operator?    
   
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    Does Java have "goto"?
        Is is true that JAVA is not 100% object oriented language ?    
   
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    What is the difference between attribute and parameter ?    
   
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    What is Clonnable Interface in java? IS it implemented by the ProtoType Design Pattern?    
   
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    How to make application thread-safe ?    
   
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    Why Java is not fully object oriented?    
   
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    How to create .xsl by using java?    
   
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    What is the difference between Enumeration and Iterator?. When i can use Enumeration and when i can use iterator?. Can any one tell me the situation that only Enumeration could able to solve that problem and vice versa.    
   
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    What is the difference between Observable and Observer?    
   
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    What is the difference between a field variable and a local variable?    
   
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    How does multithreading take place on a computer with a single CPU?    
   
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    Which characters may be used as the second character of an identifier, but not as the first character of an identifier?    
   
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    What are wrapped classes?    
   
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    What are the legal operands of the instanceof operator?    
   
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    What is the latest version of JDBC. What are the new features are added in that?    
   
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    What is the difference b/w Iterator & ListIterator    
   
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    What is the difference between throw and throws clause, explain in programatically    
   
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    what is widning and narrowing ?    
   
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    What is the difference between Hashmap and Hashtable?    
   
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    Give a sample program in Java?    
   
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    What is the corresponding Layout for Card in Swing ?
    What is the latest version of JDBC. What are the new features are added in that?    
   
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    Plz give me detail difference between Tomcat & Weblogic server    
   
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    What is casting?    
   
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    What is JDBC API in JAVA?    
   
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    What is the immediate superclass of the Dialog class?    
   
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    How to communicate 2 threads each other?    
   
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    what is servelet?    
   
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    What is the purpose of the finally clause of a try-catch-finally statement?    
   
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    How will you pass parameters in RMI. Why u serialize?    
   
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    What is the difference between Vector, Array and Arraylist?    
   
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    Which Component subclass is used for drawing and painting?    
   
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    When is an object subject to garbage collection?    
   
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    what is the difference between java and c++    
   
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    What is the functionality stubs and skeletons    
   
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    Can an object's finalize() method be invoked while it is reachable?    
   
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    What is the use of System.err.println()?, explain clearly what is System.err.println()?, what r the access specifiers available in System class?    
   
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    What is the difference between HashMap and TreeMap    
   
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    What is the difference between a Scrollbar and a ScrollPane?    
   
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    What is the difference between HashMap and TreeMap?    
   
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    Are constructors inherited?Can a subclass call the parent's class constructor?When?
    Can i limit the initial capacity of vector in java?    
   
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    How do I instantiate a bean whose constructor accepts parameters using the useBean tag?    
   
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    Can you write Java code for declaration of multiple inheritance in Java ?    
   
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    What is difference between string and stringtokenizer?    
   
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    Is null a keyword?    
   
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    Name four methods every Java class will have.    
   
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    Tell me the differences between enumeration and iteration?Which can use where in realtime?    
   
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    Explain 2 tier and 3 -tier Architecture?    
   
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    What is the Layout for ToolBar?    
   
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    Why do we need interface in Java. Instead of interface we can write the methods in the class itself. Why do we need seperate interface?    
   
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    Why Java is not 100 % pure OOPS?    
   
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    When is update method called?    
   
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    What is the difference between array list and linked list. in which situations we are use them? which is best one?    
   
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    For a 25MHz processor , what is the time taken by the instruction which needs 3 clock cycles, (a)120 nano secs (b)120 micro secs (c)75 nano secs (d)75 micro secs    
   
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    Difference between wait and notify in java    
   
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    What does the "final" keyword mean in front of a variable? A method? A class?    
   
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    What is phantom memory    
   
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    How many JVM could be run on an operating system. if only one then what is the logical reason.    
   
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    What is class loader?    
   
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    What method is invoked to cause an object to begin executing as a separate thread?
14
    What is a Java package and how is it used?    
   
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    What is the main functionality of the Remote Reference Layer?    
   
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    What is JVM Heap Size? How does it affect the performance of the Application?    
   
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    What method should the key class of hashmap override    
   
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    What is a string Handling? How to use it? what is difference b/w Event handling?    
   
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    What is the Map interface?    
   
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    How will you initialize an Applet?    
   
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    Have you ever used HashTable and Dictionary    
   
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    Write a program on RMI and JDBC using Stored Procedure?    
   
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    What is the purpose of the System class?    
   
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    Which containers may have a MenuBar?    
   
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    What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?    
   
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    How you can know about drivers and database information?    
   
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    What is the difference between Delegation event model and Inheritance event model    
   
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    What is the difference between Classpath and Import?    
   
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    WHEN UR USING ARRAYLIST AND LIKEDLIST AND VECTOR AND HASHMAP AND HASHTABLE?    
   
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    What is Socket. How will you create a connection?    
   
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    I want to store more than 10 objects in a remote server. Which methodology will you follow?    
   
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    What is JNI?    
   
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    What is differnce between byte code and unicode?
15
    What is Socket. How will you create a connection?    
   
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    What is differnce between byte code and unicode?    
   
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    What is JVM?    
   
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    What do you mean by marker interfaces? While no methods are presented in the marker interfaces,then what is the need of having them? In what circumstances we will use marker interfaces?    
   
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    What is the List interface?    
   
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    In servlets, we are having a web page that is invoking servlets username and password. which is cheks in the database, Suppose the second page also. If we want to verify the same information whether it will connect to the database or it will be used previous information?    
   
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    Given two tables Student(SID, Name, Course) and Level(SID, level) write the SQL statement to get the name and SID of the student who are taking course = 3 and at freshman level.    
   
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    What is the difference between Serializalble and Externalizable interface?    
   
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    What is the purpose of a statement block?    
   
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    Difference between "APPLET" and "APPLICATION"    
   
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    Is "abc" a primitive value?    
   
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    Is there any tag in HTML to upload and download files    
   
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    What do you know about networking support in Java?    
   
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    What is the relationship between clipping and repainting?    
   
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    JVM is platform independent/dependent?why? 2) which one is faster in execution Array List or Array? why?    
   
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    Class hierarchy of AbstractMap is as follows "AbstractMap implements Map" Class hierarchy of HashMap is as follows "HashMap extends AbstractMap implements Map" When AbstractMap implements Map interface and AbstractMap is extended by HashMap, what is the use of again implementing Map interface in the declaration of HashMap?.    
   
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    What is the difference between applet and swing?    
   
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    Can an exception be rethrown?    
   
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    1-explain singleton pattern in java 2-explain up casting and down casting 3-how do u code a singleton in java 4-How do u read XML file in java 5-gine an example of the Decorator pattern in the java API. 6-What r the services provided by the container? 7-what r bean managed transaction? 8-what r transaction attributes? 9-what is JTS?    
   
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    Can we send object using Sockets
16
    If my java based application is hanging once in a while. Where would you start looking at the problem, what changes can you do? My application has a builtin Ldap client and is communicating with a Ldap server. now having a problem with the authentication, how should i start troubleshooting? I, being responsible for the application and the OS, what can i do?    
   
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    Can we create object of Object class in java?    
   
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    When can an object reference be cast to an interface reference?    
   
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    How many modifiers are there in java?    
   
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    What is the difference between a CallableStatement and PreparedStatement?    
   
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    What is the difference between Observable and Observer    
   
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    How can u move/drag a component placed in Swing Container?    
   
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    How an Hashtable can change the iterator? Can a HashMap change the iterator?    
   
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    What is the difference between transient variable,volatile variable    
   
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    What is the middleware. What is the functionality of Webserver?    
   
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    Is the ternary operator written x : y ? z or x ? y : z ?    
   
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    What is the exact difference in between Unicast and Multicast object. Where we will use?    
   
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    What is the difference between wait(), join(), sleep(), notify() & notifyall() methods?    
   
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    What is difference between array list and vector.? and which one is most useful.? array list does whatever vector does so why we need the array list?    
   
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    How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8characters?    
   
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    Can you load the server object dynamically. If so, what are the major 3 steps involved in it?    
   
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    What is the corresponding Layout for Card in Swing?    
   
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    What is the base class for all swing components?    
   
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    Difference: AWT, Swing    
   
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    I have one java action form that i setAttribut() and on jsp get reslutset as getAttribute() and print on jsp. again i want this rsult on next jsp threw getAttribute(), but on this last page i cannot get result. so how to do this. i have tried this to setAttribute() and again get but it gets only reference on last page so please give me solution.
17
    What is list interface?    
   
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    Write a java program to find out this.Consider a=1,b=2,c=3,d=4,.............z=26.Then get any five alphabets from the user and according to the alphabets take their corresponding values and all the values of that five alphabets then divide the result comes from addition with 26.Now you will get another value now print the corresponding alphabet of the result comes after division....For Example suppose if we getting a,b,c,d,e,k as the five alphabets as input from the user then we know that a=1,b=2,c=3,d=4,e=5,k=11 so now we get a+b+c+d+e+k=1+2+3+4+11=26 and then we have to do 26/26=1 then we know a=1 so the result to be printed is "a".Write a java program to perform all these calculations.And one main thing DON'T USE ANY INBUILT FUNCTIONS...    
   
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    I need your help to answer the code shown below. using System; using System.Collections.Generic; using System.Text; using System.Collections; namespace ApplicantTestin { /// The DataObject class stored with a key class DataObject { // Populate } class Program { static Hashtable Data = new Hashtable(); static string[] StaticData = new string[] { "X-Ray","Echo","Alpha", "Yankee","Bravo", "Charlie", "Delta", "Hotel", "India", "Juliet", "Foxtrot","Sierra", "Mike","Kilo", "Lima", "November", "Oscar", "Papa", "Qubec", "Romeo", "Tango","Golf", "Uniform", "Victor", "Whisky", "Zulu"}; static void Main(string[] args) { for(int i=0;i<StaticData.Length; i++) Data.Add(StaticData[i].ToLower(), new DataObject(StaticData[i]) ); while(true) { PrintSortedData(); Console.WriteLine(); Console.Write("> "); string str = Console.ReadLine(); string[] strs = str.Split(' '); if(strs[0]=="q") break; else if(strs[0]=="printv") PrintSortedDataByValue(); else if(strs[0]=="print") PrintSortedData(); else if(strs[0]=="inc") Increase(strs[1]); else if(strs[0]=="dec") Decrease(strs[1]); else if(strs[0] == "swap") Swap(strs[1], strs[2]); else if (strs[0] == "ref") Ref(strs[1], strs[2]); else if (strs[0] == "unref") UnRef(strs[1]); } } /// <summary> /// Create a reference from one data object to another. /// </summary> /// <param name="key1">The object to create the reference on</param> /// <param name="key2">The reference object</param> static void Ref(string key1, string key2) { // Populate } /// <summary> /// Removes an object reference on the object specified. /// </summary> /// <param name="key">The object to remove the reference from</param> static void UnRef(string key) { // Populate } /// <summary> /// Swap the data objects stored in the keys specified /// </summary> static void Swap(string key1, string key2) { // Populate } /// <summary> /// Decrease the Value field by 1 of the /// data object stored with the key specified /// </summary> static void Decrease(string key) { // Populate } /// <summary> /// Increase the Value field by 1 of the /// data object stored with the key specified /// </summary> static void Increase(string key) { // Populate } /// <summary> /// Prints the information in the Data hashtable to the console. /// Output should be sorted by key /// References should be printed between '<' and '>' /// The output should look like the following : /// /// /// Alpha...... -3 /// Bravo...... 2 /// Charlie.... <Zulu> /// Delta...... 1 /// Echo....... <Alpha> /// --etc--- /// /// </summary> static void PrintSortedData() { // Populate } /// <summary> /// Prints the information in the Data hashtable to the console. /// Output should be sorted by stored value /// References should be printed between '<' and '>' /// Sorting order start from max to min, larger value takes priority. /// The output should look like the following : /// /// /// Bravo...... 100 /// Echo...... 99 /// Zulu...... 98 /// Charlie.... <Zulu> /// Delta...... 34 /// Echo....... 33 /// Alpha...... <Echo> /// --etc--- /// /// </summary> static void PrintSortedDataByValue() { // Populate } } }    
   
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    What is the difference between final, finally and finalized?    
   
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    What is the order of intialization of variables in Java.    
   
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    Why operator overloading is not allowed in Java?    
   
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    What restrictions are placed on method overloading?    
   
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    Statement statement = dbConnection.createStatement(); . What is Statement refers to. is it a interface or a class??    
   
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    What is a refferent?    
   
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    What is the immediate superclass of the Dialog class?    
   
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    How single threaded model works after implementation in class, basically architecture point of view.    
   
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    What is transient variable?    
   
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    What are order of precedence and associativity, and how are they used?    
   
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    What modifiers can be used with a local inner class?    
   
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    What is the difference between String and StringBuffer?    
   
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    What is the difference between run-time Polymorphism and compile-time Polymorphism?    
   
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    Can you make a method final, without making the whole class final?    
   
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    If an object is garbage collected, can it become reachable again?    
   
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    As the Swings have more advantages over the AWT.. Why still in market are they using AWTs??    
   
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    What is the sweep and paint algorithm
18
    How do you communicate in between Applets & Servlets?    
   
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    How can we take various inputs from user as int,char,string,float etc ?    
   
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    How are Java source code files named?    
   
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    What is the protocol used by server and client?    
   
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    What is the purpose of the enableEvents() method?    
   
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    Explain variable shadowing with example?    
   
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    What is synchronization and why is it important?    
   
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    What is the difference between Java API & Applets.    
   
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    Mention 5 basic difference between Array List and Vector in Java Colletion FrameWork.    
   
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    How can you push data from an Applet to Servlet?    
   
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    In an HTML form I have a Button which makes us to open another page in 15 seconds. How will do you that?    
   
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    What is the difference between ?overloading? and ?overriding??    
   
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    What you know about Corba implementation in Java?    
   
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    What is Serialization and deserialization?    
   
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    What is the command pattern ?where it is used?    
   
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    Write a program for recursive Traverse?    
   
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    What is JAR file?    
   
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    What is the main functionality of the Prepared Statement    
   
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    Why do threads block on I/O?    
   
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    When should i used notify() and notifyall() methods on threads
19
    What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class    
   
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    What are the various access modifiers in Java. Differences between them?    
   
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    What is the purpose of finalisation    
   
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    What is the difference between File and RandomFileAccess classes?    
   
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    What state is a thread in when it is executing?    
   
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    What are session variable in Servlets?    
   
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    Write down how will you create a binary Tree?    
   
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    How can i call parameterized constructor if am instantiating a object using "Class.forName("Abc").newInstance()"?    
   
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    What is the difference between function synchronization and object synchronization?    
   
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    What do you mean by multiple inheritance in C++ ?    
   
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    What is meant by memory leak?    
   
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    What is super class of an Exception class?    
   
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    What are the disadvantages of reference counting in garbage collection    
   
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    What invokes a thread's run() method?    
   
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    How to communicate 2 threads each other    
   
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    Does JVM maintain a cache by itself? Does the JVM allocate objects in heap? Is this the OS heap or the heap maintained by the JVM? Why    
   
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    How can the Checkbox class be used to create a radio button?    
   
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    What is the difference between an Applet and an Application?    
   
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    How would you pass a java integer by reference to another function    
   
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    How to compare Stringbuffer objects?
20
    What is the difference between String and StringBuffer? Which is better to use in project?    
   
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    What is the difference between RMI & Corba    
   
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    Is there a separate stack for each thread in Java    
   
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    How to invoke the primitive types within object in arraylist?    
   
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    What is the difference between yielding and sleeping?    
   
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    Explain Servlet and JSP life cycle    
   
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    What is upward and downward casting in Java?    
   
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    What is the serialization?    
   
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    What is the order of method invocation in an Applet?    
   
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    How are Observer and Observable used?    
   
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    What are the high-level thread states?    
   
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    Why should every class in java extend Object class?    
   
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    What is the difference between a Window and a Frame?    
   
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    What is the return type of a program's main() method?    
   
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    What are the benefits of Swing over AWT    
   
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    what happens if we execute the program? class Return{ int display(){ try{ return 1; } finally{ return 2; } } public static void main(String args[]){ Return r=new Return(); r.display(); } }    
   
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    Discuss why Java 5 Executors are the preferred mechanism of creating and dispatching work in separate threads, over either directly creating Thread objects or directly using a pool of threads?    
   
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    Write a java program for converting floating point number into Natural or cash number.For example take a floating point number 15.66666 and ask the user to which format this floating point number 15.66666 to be converted.If the user wants it to convert into Natural then display the output as 15.7 or if the user wants it to convert in to Cash then display the output as 15.65.Important thing is DON'T USE IN-BUILT FUNCTIONS...    
   
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    What value does readLine() return when it has reached the end of a file?    
   
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    What are differences between Enumeration, ArrayList, Hashtable and Collections and Collection?
21
    How all can you instantiate final members    
   
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    What synchronization constructs does Java provide? How do they work?    
   
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    How to create the object to the anonomous class    
   
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    What is the difference between a MenuItem and a CheckboxMenuItem?    
   
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    What are the various access modifiers in Java. Differences between them    
   
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    Can we write main method without static keyword in java main class, give an example?    
   
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    What is the argument type of a program's main() method?    
   
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    What's the difference between == and equals method?    
   
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    What is meant by Tomcat in java and its usage?    
   
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    What are the various Collection classes available?    
   
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    Given a text file, input.txt, provide the statement required    
   
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    What are the differences between Java & C++ in terms of its features?    
   
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    What is the difference between trusted and untrusted applet?    
   
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    Why do we need interface in Java. Instead of interface we can write the methods in the class itself. Why do we need seperate interface?    
   
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    How have you done validation of the fileds in your project?    
   
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    What is DatagramSocket. How will you create a connection?    
   
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    How do you communicate in between Applets & Servlets    
   
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    When a thread blocks on I/O, what state does it enter?    
   
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    How many ways do we have to load a class    
   
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    How does multithreading take place on a computer with a single CPU?
22
    Can an object be garbage collected while it is still reachable?    
   
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    When a thread blocks on I/O, what state does it enter?    
   
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    How does multithreading take place on a computer with a single CPU?    
   
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    What is the difference between Eventlistener and Eventadapter?    
   
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    Differences between servlet context and servlet config?    
   
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    It is a saying that static methods in JAVA programs should be minimised. What is the reason for this? any problems arise or there is any performance measures to be looked into it.    
   
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    What classes of exceptions may be caught by a catch clause?    
   
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    Tell me the latest versions in JAVA related areas?    
   
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    Describe java's security model.    
   
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    can dead thread restart?    
   
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    What is JavaMail?    
   
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    If we have two public classes in a single java file ,how i have to give the name of the particular java file and how i can compile it?    
   
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    Can you run the product development on all operating systems?    
   
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    What is the advantage of the event-delegation model over the earlier event inheritance model?    
   
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    How to check infinity value? when we passed too large number in String and cast in to float value it will be give infinity. how to catch it?    
   
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    When you use a struts framework, where would you place your business logic    
   
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    Can an unreachable object become reachable again?    
   
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    What is the difference between a Window and a Frame?    
   
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    Can u kill thread manually. What is the disadvantage    
   
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    It is essential to catch all types of exceptions
23
    What is the difference between a static and a non-static inner class?    
   
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    Are there any other 'marker' interfaces?    
   
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    What is the relationship between the Canvas class and the Graphics class?    
   
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    Which java.util classes and interfaces support event handling?    
   
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    What is garbage collection?Can it be forced?    
   
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    How can I swap two variables without using a third variable?Can u plz tell me the logic behind it..?    
   
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    What is the use of Servlets?    
   
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    Difference b/w synchronized Method and synchronized statement in case of whole body of method cover by synchronized statement.    
   
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    What is an object's lock and which object's have locks?    
   
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    Why java shouldbe preferred,when we can get the sameoutput using VB orany otherlanguages. Howcan we convincethe interviewer ,other than givingthe simple features ofjava. could anyone pls answer this question?    
   
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    What is the difference between Stream Reader and Stream Writer?    
   
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    How can we use hashset in collection interface?    
   
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    What class allows you to read objects directly from a stream?    
   
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    What advantage do Java's layout managers provide over traditional windowingsystems?    
   
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    What happens when you add a double value to a String?    
   
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    What are native methods? How do you use them?    
   
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    What is the relationship between an event-listener interface and an event adapterclass?    
   
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    How we know a class is Serialized or not from a package    
   
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    Is sizeof a keyword?    
   
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    What is the difference between static and non-static variables
24
    What is the Difference between Design Pattern and Architecture? Can any one answer for this plz..    
   
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    What is Garbage Collector in java?    
   
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    Which containers use a border Layout as their default layout?    
   
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    I studied that "Abstract class means ,it doesn't maintain the complete information about the particular class". Is it right? Justify?    
   
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    What do you mean by static methods?    
   
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    Do primitive types have a class representation    
   
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    Write a java standalone program / method to take out all the special characters in the string provided below. //ASCII a ? z (97 ? 122) String sSENTENCE = ?This!is^a$t*e)s|t?;    
   
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    What happens when you invoke a thread's interrupt method while it is sleeping or waiting?    
   
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    What are the problems faced by Java programmers who don't use layout managers?    
   
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    What is Difference between AWT and Swing?    
   
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    What are the different XML files used in J2EE?    
   
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    How can you load DLL files when your java class is loading first time ?    
   
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    Why are Java ARchive (JAR) files important?    
   
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    What happens when a thread cannot acquire a lock on an object?    
   
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    What method is used to specify a container's layout?    
   
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    What value does readLine() return when it has reached the end of a file?    
   
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    What is the difference between StringBuffer and String class?    
   
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    What is the difference between preemptive scheduling and time slicing?    
   
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    What are the various ways of creating a thread. What is difference between them?    
   
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    What restrictions are placed on the location of a package statement within a source code file?
25
    Write the Java code to declare any constant (say gravitational constant) and to get its value.    
   
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    What classes of exceptions may be thrown by a throw statement?    
   
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    What restrictions are placed on method overriding?    
   
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    What are the files generated after using IDL to Java Compilet    
   
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    How many methods in the Externalizable interface?    
   
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    What is the difference between applet and application?    
   
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    System Class is Used to Output text onto the Screen? it True or False    
   
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    Explain the new Features of JDBC 2.0 Core API?    
   
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    Can a for statement loop indefinitely?    
   
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    Which class is the immediate superclass of the MenuComponent class.Object?    
   
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    What interface is extended by AWT event listeners?    
   
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    What is JDBC. How do you connect to the Database    
   
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    Why single inheritance cannot be use in java/why we alwayz use multiple inheritances?    
   
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    What do you like most with Ant    
   
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    What are 4 drivers available in JDBC?    
   
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    Is &&= a valid Java operator?    
   
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    What is the difference between a public and a non-public class?    
   
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    What is the difference between Class.forName and registerDriver()    
   
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    What is the ResourceBundle class?    
   
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    What's new with the stop(), suspend() and resume() methods in JDK 1.2?
26
    Java does not support multiple inheritance because different classes may have different variable with same name that may be contradicted and can cause confusions resulting in errors.Java supports it through the interfaces.A class can extend one class and can implement more than one interfaces also.those interfaces may have variables with same names.Wont they create confusion?    
   
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    What design patterns have you used    
   
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    What is the SimpleTimeZone class?    
   
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    How can we invoke private method using refleciotn API(AccessibileObject class)?    
   
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    What is serilization and deserilization    
   
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    What is the Collections API?    
   
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    What is the perfect definition of an Adapter class, explain with an example    
   
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    How does a try statement determine which catch clause should be used tohandle an exception?    
   
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    Why should we use java?    
   
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    What is difference between runnable and thread ? why we use static class    
   
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    How many layout's are there in java? explain each one of them    
   
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    Suppose If we have variable ' I ' in run method, If I can create one or more thread each thread will occupy a separate copy or same variable will be shared?    
   
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    How to call a COM object within java?    
   
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    How does garbage collection work    
   
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    In what situations we can use innerclass and anonymous class    
   
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    What is the difference between overloading and overriding    
   
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    What class is the top of the AWT event hierarchy?    
   
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    How to track "memory leak" and how to prevent it in java?    
   
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    What method must be implemented by all threads?    
   
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    What invokes a thread's run() method?
27
    what is difference between instance and object.? what are the all difference between interface and abstract class?    
   
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    what is the use of prediction word in java ?    
   
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    How to access Blob and Clob data values from oracle thru java?    
   
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    When a thread is created and started, what is its initial state?    
   
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    What is synchronization and why is it important?    
   
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    Can try statements be nested?    
   
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    What is final variable?    
   
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    What is the purpose of garbage collection?    
   
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    Why String is not a primitive data type    
   
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    What is the base class for all swing components    
   
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    What is the command to know which version of java you are using    
   
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    send me some interview questions on Stringhandling concept    
   
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    When exactly a static block is loaded in Java ?    
   
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    . Write a static method removeDuplicates(Character[] in) that returns a new array of the characters in the given array, but without any duplicate characters. Always keep the first copy of the character and remove subsequent ones. For example, if in contains b, d, a, b, f, a, g, a, a, and f, the method will return an array containing b, d a, f, and g. Hint: One way to solve this problem is to create a boolean array of the same size as the given array in and use it to keep track of which characters to keep. The values in the new boolean array will determine the size of the array to return    
   
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    In Java, how are objects / values passed around    
   
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    What are synchronized methods and synchronized statements?    
   
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    What you know about Corba implementation in Java ?    
   
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    A local inner class may be final or abstract ?    
   
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    What is the purpose of using Java Beans? when should we extend JavaBean class? Please send the result of shuffles(1002,101) along with your program    
   
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    What are order of precedence and associativity, and how are they used?
28
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    Is "abc" a primitive value?    
   
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    When is an object subject to garbage collection?    
   
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    Whether a Class,Method can be garbage collected or not?How?    
   
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    What do you meant by private constructor? why somebody declare only private constructor.    
   
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    Does a class inherit the constructors of its superclass?    
   
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    How come hashcodes can be the same even if objects aren't equal?    
   
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    Can wehave run() method directly without start() method in threads?    
   
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    Considering notepad/IE or any other thing as process, What will happen if you start notepad or IE 3 times. Where 3 processes are started or 3 threads are started?    
   
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    Can you instantiate the Math class?    
   
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    How do you declare constant values in java?    
   
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    What are three ways in which a thread can enter the waiting state?    
   
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    What must a class do to implement an interface?    
   
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    If you have truncated using JDBC, How can you know that how much data is truncated?    
   
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    What is the difference between a break statement and a continue statement?    
   
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    What is the finalize method do?    
   
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    What is ServerSocket. How will you create a connection    
   
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    What restrictions are placed on method overloading?    
   
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    Can You catch the Error? 2. Difference between compiletime exception and runtime exception? 3. How you throw user defined exception? 4. How you handle throwable while using exceptions ? 5. What are the methods available in Object ? 6. Is there any methods available in serialization ? 7. How you seralize an Object ? 8.How you get the serialized object ? 9. Any methods available in deseralization ?    
   
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    What are the traverses in Binary Tree?    
   
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    Can we have 3 methods in a single servlet i.e service(), doPost() and doGet() method. If yes, then what method will be called. Tell me the servlet cycle in such cases
29
    What would happen if you say this = null    
   
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    What is the difference between Inheritance and Aggrigation?    
   
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    how to combine two files into single file    
   
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    What is difference RMI registry and OSAgent?    
   
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    What modifiers may be used with a top-level class    
   
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    When is update method called    
   
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    What modifiers can be used with a local inner class?    
   
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    What is the difference between InputStream/Outputstream classes    
   
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    What is a compilation unit?    
   
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    What is the difference in between the HTTPServlet and Generic Servlet. Expalin their methods. Tell me their parameter names too?    
   
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    What is the difference between Comparable and Comparator?    
   
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    What is difference between try and throws, as these are two different methods to handle the exceptions.    
   
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    What is similarities/difference between an Abstract class and Interface?    
   
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    What methods are used to get and set the text label displayed by a Buttonobject?    
   
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    What are the similarities and differences between Java and C/C++?    
   
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    What is the purpose of the File class?    
   
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    How is rounding performed under integer division?    
   
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    When is the finally clause of a try-catch-finally statement executed?    
   
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    What is the difference between a while statement and a do statement?    
   
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    What is meant by Session, Tell me something about HTTPSession Class?
30
    What happens if a try-catch-finally statement does not have a catch clause to handle an exception that is thrown within the body of the try statement?    
   
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    To what value is a variable of the boolean type automatically initialized?    
   
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    What modifiers may be used with an interface declaration?    
   
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    How would you declare a SingleThreaded servlet    
   
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    Considering notepad/IE or any other thing as process, What will happen if you start notepad or IE 3 times. Where 3 processes are started or 3 threads are started    
   
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    What is serialization?    
   
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    What is RMI?    
   
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    What is a transient variable?    
   
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    Can an anonymous class be declared as implementing an interface and extending a class?    
   
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    Write a program that singleton objects returns two instances?    
   
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    What state does a thread enter when it terminates its processing?    
   
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    When we need of abstract class and interface?could you please tell me the realtime example?    
   
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    What is autoboxing?    
   
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    When should i used notify() and notifyall() methods on threads?    
   
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    Which non-Unicode letter characters may be used as the first character of an identifier?    
   
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    What is the % operator?    
   
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    What is the diffrence between an Abstract class and Interface?    
   
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    In How many ways we can request the System for the garbage collection to cleanup the memory? And what are the differences?    
   
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    Please Give me an example for User defined Exception    
   
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    What is difference between array & arraylist?
31
    And What situation , each of the 4 drivers used?    
   
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    What is the List interface?    
   
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    What is the relationship between an event-listener interface and an event-adapter class?    
   
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    What is JVM    
   
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    What is DriverManager?    
   
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    What is the difference between Eclipse3.0 and Jbuilder tool?    
   
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    If a variable is declared as private, where may the variable be accessed?    
   
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    What is data encapsulation? What does it buy you    
   
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    Which Component subclass is used for drawing and painting?    
   
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    I want to know output of this program and the flow also public class Aquestion { private int i = giveMeJ(); private int j = 10; private int giveMeJ() { return j; } public static void main(String args[]) { System.out.println((new Aquestion()).i); } }    
   
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    What are abstract classes, abstract methods?    
   
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    Why java is not 100% oops    
   
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    What are wrapped classes?    
   
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    What is the difference in between C++ and Java. can u explain in detail?    
   
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    What is the Locale class?    
   
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    What happens when a thread cannot acquire a lock on an object?    
   
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    What are E and PI?    
   
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    Can i expand an interface?    
   
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    How does Java handle integer overflows and underflows?    
   
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    What is collection framework?what interfaces and classes support collection framework?
32
    if two overloaded methods are- Test(Object xyz) and test(Customer cust)[Assume Customer is a class with member name of type String].Now if we call test(null), which method will be called? why?    
   
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    What is the difference between paint() and repaint() methods    
   
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    Why are the methods of the Math class static?    
   
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    What is J2EE?    
   
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    Name the containers which uses Border Layout as their default layout?    
   
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    Where the CardLayout is used?    
   
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    Describe the principles of OOPS.    
   
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    What is final class?    
   
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    What are the primitive types in Java?    
   
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    Which containers may have a MenuBar?    
   
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    Which package is always imported by default?    
   
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    What is meant by Servelet. What are the parameters of the service method    
   
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    Name three Component subclasses that support painting?    
   
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    What is difference between java.lang .Class and java.lang.ClassLoader? What is the hierarchy of ClassLoader    
   
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    Why Java is not fully objective oriented    
   
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    What are the modules in a J2EE application?    
   
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    What are synchronized methods and synchronized statements?    
   
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    Name three subclasses of the Component class?    
   
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    What is the purpose of finalization in Java Programming?    
   
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    What is the difference between the String and StringBuffer classes
32
    What is the life cycle of an applet    
   
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    What is the difference between a Choice and a List?    
   
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    What is the immediate superclass of the Applet class?    
   
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    As the Swings have more advantages over the AWT.. Why still in market are they using AWTs?? plzz..i want answer..in many interviews they asked me the same.    
   
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    import java.io.*; import java.lang.*; class dinput { public void show() { System.out.println("Java"); } } class dmain { public static void main(String a[]) { dsystem.dout.show(); } } import java.io.*; import java.lang.*; public final class dsystem { public static final dinput dout; } I wanted to know how exactly System.out.println() works so i tried alternate program which would run similar to System.out.println() but when i compile its giving me "variable dout might not have been initialized". Accordingly System is public final class udner java.lang package. out is a reference variable of the type PrintStream which is declared as public static final PrintStream out. println() is a non static overloaded method present in PrintStream class. My point is how can a static variable 'out' access a non static method. So i have written a program which is very similar to it. The above program dsystem class is placed in dsystem.java file which is similar to System. The dmain and dinput is placed in dmain.java file where is dinput is similar to PrintStream class and show is similar to println() method. dsystem.dout.show(); is similar to System.out.println(); But when i compile the program i get the error "variable dout might not have been initialized". I request someone to clarify my doubts.    
   
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    Why we use interface in java?    
   
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    Why we can't put semicolon at the end of a class in java??    
   
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    What happen if we write many curly braces in main method and write println method inside it .program will compile or not?    
   
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    What is the catch or declare rule for method declarations?    
   
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    What is the advantage of the event-delegation model over the earlier event inheritance model?    
   
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    What is the Set interface?    
   
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    Name three Component subclasses that support painting?    
   
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    We know that Object class is super class of every class & a class extends only one class. so how is it possible to a class to extend other than Object class?    
   
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    If an object is garbage collected, can it become reachable again?    
   
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    What is a daemon thread?    
   
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    What synchronization constructs does Java provide? How do they work?    
   
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    Are there any practical limits on the levels of subclassing? How deep can you go?    
   
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    What is the difference between the String and StringBuffer classes?    
   
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    Can an anonymous class be declared as implementing an interface andextending a class    
   
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    Which Collection class is used for FIFO in Java?
33
    Which package is always imported by default?    
   
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    What is a Singleton class, what is it's significance?    
   
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    Suppose server object is not loaded into the memory, and the client requests for it, what will happen    
   
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    What is the difference between yielding and sleeping in Java Programming?    
   
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    Why does not support multiple Inheritance?    
   
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    Name four Container classes?    
   
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    Searching a String?    
   
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    Can a for statement loop indefinitely?    
   
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    What is the difference between synchronized block and normal block ?    
   
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    What's new with the stop(), suspend() and resume() methods in JDK 1.2    
   
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    What is the webserver used for running the Servlets    
   
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    What value does read() return when it has reached the end of a file?    
   
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    To what value is a variable of the String type automatically initialized?    
   
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    Is a class a subclass of itself?    
   
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    Which class should you use to obtain design information about an object?    
   
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    How can a GUI component handle its own events?    
   
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    What is an object's lock and which object's have locks?    
   
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    What is the main difficulties that you are faced in your project?    
   
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    What is the main functionality of the Prepared Statement?    
   
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    Is there any difference between Execution Engine and the JIT in java?
34
    What is BYTE Code?    
   
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    What is abstract method?    
   
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    What is the difference between main() and Main()    
   
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    What is final class    
   
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    What are the differences between C++ and Java    
   
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    What are the problems faced by Java programmers who don't use layoutmanagers?    
   
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    Can a method be static and synchronized    
   
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    What is the difference between a static and a non-static inner class?    
   
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    What is the argument type of a program's main() method?    
   
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    What is anonymous class?    
   
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    When, where and why we are using overloading and overriding???    
   
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    In what situations we can use innerclass and anonymous class    
   
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    How i can validate the user, Is there any java api is there for that. Or i can use my one business logic. If both are possible, Then which one is the best way for real time.    
   
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    Why should i use ejb as i can do it in servlet?    
   
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    What are the files generated after using IDL to Java Compilet?    
   
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    Why is collection framework called as framework?    
   
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    How do you sing an Applet?    
   
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    What is ServerSocket. How will you create a connection?    
   
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    What is the immediate superclass of Menu?    
   
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    What is the difference between the >> and >>> operators
36
    What modifiers may be used with a top-level class?    
   
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    What is the difference between servlets and jsp    
   
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    What is the difference between the Font and FontMetrics classes?    
   
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    What are the Object and Class classes used for?    
   
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    In client-server approach, how to get an IP address of remote machine, and how we can find whether tht machine is connected with server or not. I hv found one solution is pinging in background, but how we can do such pinging? how can we find out tht we r getting reply of ping?    
   
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    What is Difference between AWT and Swing    
   
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    What is Class.forName() does and how it is useful?    
   
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    What are the various layouts available. What is the difference between them?    
   
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    What is the serialization?    
   
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    What happens when a thread cannot acquire a lock on an object?    
   
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    What is Servlet API used for conneting database    
   
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    How We Can We write our own exceptions?    
   
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    How could create list which can contain super class and all of its sub class?    
   
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    How you can know about drivers and database information    
   
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    What is Servlet API used for conneting database?    
   
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    What are E and PI?    
   
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    When will a static variable is loaded?is it at compile time or runtime?    
   
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    What is the Dictionary class?    
   
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    Name Component subclasses that support painting in Java Programming?    
   
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    Which class should you use to obtain design information about an object?
37
    Why java.lang Package is the Default package?    
   
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    What is a memory footprint? How can you specify the lower and upper limits of the RAM used by the JVM? What happens when the JVM needs more memory    
   
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    To a server method, the client wants to send a value 20, when this value exceeds 20 a message should be sent to the client. What will you do for achieving for this?    
   
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    What is JAR file?    
   
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    What is casting?    
   
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    What's the difference between == and equals method?    
   
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    What is the difference between Hashmap and Hashtable    
   
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    What is synchronization and why is it important?    
   
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    What is the difference between encapsulation & abstraction?    
   
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    if interface & abstract class have same methods & abstract class also not contain any implementation for those methods which one you prefer ?    
   
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    . Create a class that will bundle together several static methods for tax computations. This class should not have a constructor. Its attributes are ? basicRate?the basic tax rate as a static double variable that starts at 4 percent ? luxuryRate?the luxury tax rate as a static double variable that starts at 10 percent Its methods are ? computeCostBasic(price)?a static method that returns the given price plus the basic tax, rounded to the nearest penny. ? computeCostLuxury(price)?a static method that returns the given price plus the luxury tax, rounded to the nearest penny. ? changeBasicRateTo(newRate)?a static method that changes the basic tax rate. ? changeLuxuryRateTo(newRate)?a static method that changes the luxury tax rate. ? roundToNearestPenny(price)?a private static method that returns the given price rounded to the nearest penny. For example, if the price is 12.567, the method will return 12.57.    
   
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    How do you release an object which is locked in a synchronized block    
   
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    Why is the Object class super class of all the classes?    
   
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    What is the difference between overloading and overriding?    
   
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    What value does readLine() return when it has reached the end of a file    
   
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    What is Serialization and Deserialization    
   
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    What are the differences between EJB and Java beans    
   
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    Discuss the differences between creating a new class, extending a class and implementing an interface; and when each would be appropriate.    
   
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    whats the difference in data types of java and c++? 2)what is the use of finally block?? 3)what is encapsulation in oops?how is it achieved in Java?    
   
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    What is the difference between preemptive scheduling and time slicing?
38
    What class allows you to read objects directly from a stream in Java Programming?    
   
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    How can a Variable in a class other than String type be made Immutable.    
   
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    What state is a thread in when it is executing?    
   
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    How and when to prevent inheritance?    
   
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    What is aggregation?    
   
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    what is method declaration,method attributes,method modifiers and parameters    
   
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    What is the GregorianCalendar class?    
   
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    What is the difference between the prefix and postfix forms of the ++ operator?    
   
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    How can you do multiple inheritance in Java    
   
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    What is the Locale class?    
   
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    What is the GregorianCalendar class?    
   
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    Which arithmetic operations can result in the throwing of an ArithmeticException?    
   
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    What is UML patterns?give me clear explanation    
   
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    What is the difference between an if statement and a switch statement?    
   
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    What is the highest-level event class of the event-delegation model?    
   
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    What is the use of Servlets    
   
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    Whether private,protected method can be overloaded,overrided or not?Tell me reason?    
   
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    How can we do bug tracking in an intranet project for a pharmaceutical company using java,jdbc,ejb sevlet using oracle as backend can anyone guide?    
   
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    What is the difference between the String and StringBuffer classes?    
   
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    Where exactly we make use of Clone objects in a real time?
39
    How will you add panel to a Frame    
   
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    Difference between Enumeration and Iterator    
   
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    What are the two basic ways in which classes that can be run as threads may be defined?    
   
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    What class of exceptions are generated by the Java run-time system?    
   
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    What are the main differences between Java and C++?    
   
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    What happens when you add a double value to a String?    
   
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    Can we declare final variables in side a method.    
   
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    What is the difference between classpath and path variable?    
   
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    What is the ResourceBundle class?    
   
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    What are interfaces? or How to support multiple inheritance in Java?    
   
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    What is the difference between exception and error    
   
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    How to position TextField in a frame so that it Should look Good.And in a manner that next one will come in next row of the first appeared.    
   
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    How are the elements of a BorderLayout organized?    
   
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    Can we set the time (by user) explicitly for garbage collection.?    
   
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    How do you push an applet in to the servlet?    
   
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    What is the main difference between input, output stream?    
   
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    What is it object serialization?    
   
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    What is the purpose of finalization?    
   
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    What is the immediate superclass of Menu?    
   
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    What restrictions are placed on the values of each case of a switch statement?
40
    What is an Iterator interface?    
   
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    Canweimplement aninterface in JSP Page?If yesHow?write thecode?    
   
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    To what value is a variable of the boolean type automatically initialized?    
   
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    What modifiers may be used with an inner class that is a member of an outer class    
   
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    What is java virtual machine and what is its uses?    
   
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    What is the purpose of the Runtime class?    
   
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    What is the difference between the paint() and repaint() methods?    
   
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    What is the difference between static and non-static variables?    
   
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    How many times may an object's finalize() method be invoked by the garbage collector?    
   
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    After a thread is started, via its start() m?    
   
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    How are Observer and Observable used?    
   
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    How do you invoke a Servelt. What is the difference in between doPost and doGet methods?    
   
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    What is the purpose of the toolkit in the Abstract Window Toolkit (AWT)? How does AWT work?    
   
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    Compare SWING components to standard AWT.    
   
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    Which class is extended by all other classes?    
   
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    Have you used threads in Servlet?    
   
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    What is collction framework?How it is working?Explain    
   
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    What is the advantage if a person have Java + LDAP Skills    
   
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    Is &&= a valid Java operator?    
   
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    How can a dead thread be restarted?
41
    What is the Set interface?    
   
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    Is there any provision in java to find the address of a particular memory location?(like & in 'C' language)    
   
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    Why there is no guarentee for System.gc() method will perform garbage collection for a particular time?    
   
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    In RMI, is the server object first loaded into the memory and then the stub reference is sent to the client or a stub reference is directly sent to the client    
   
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    Difference ? Java, C++    
   
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    What is heap in Java    
   
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    When you have an object passed to a method and when the object is reassigned to a different one, then is the original reference lost    
   
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    What are virtual functions?    
   
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    What is the difference between an Applet and an Application?    
   
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    What is a tagged interface?    
   
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    What are statements in JAVA?    
   
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    If a class is declared without any access modifiers, where may the class be accessed?    
   
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    What is the difference between static and non-static variables?    
   
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    How an Hashtable can change the iterator? Can a HashMap change the iterator?    
   
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    What restrictions are placed on method overloading in Java Programming?    
   
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    What is the datatypes in java?    
   
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    What is layout manager ? How does it work?    
   
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    What is the difference between a public and a non-public class?    
   
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    I am facing problem with using the JScrollPane. Actually the knob is not working properly . It takes a lot of time to scroll nd refresh the image. Please HELP!!!    
   
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    what happens if i do this=null? 2)how to swap 2 variables without using third temp variable in java? 3)constructors can not be inherited,why?
42
    Which Collection class is used for LIFO in Java?    
   
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    When does the compiler supply a default constructor for a class?    
   
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    What is the functionality of try, catch and finally blocks?    
   
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    What is callback function?    
   
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    What is the purpose of interface? And tell the difference between the class and interface?    
   
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    What is the difference between an object and an instance? And give me a real time example to differentiate these two?    
   
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    What is Java Beans ?    
   
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    What is EJB    
   
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    . Write a program in a class CharacterFrequency that counts the number of times a digit appears in a telephone number. Your program should create an array of size 10 that will hold the count for each digit from 0 to 9. Read a telephone number from the keyboard as a string. Examine each character in the phone number and increment the appropriate count in the array. Display the contents of the array.    
   
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    When a thread blocks on I/O, what state does it enter?    
   
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    What is the purpose of the enableEvents() method?    
   
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    How are the elements of a GridLayout organized?    
   
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    What is the List interface?    
   
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    What is Synchronisation in threads?    
   
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    What is the difference between the JDK 1.02 event model and the eventdelegationmodelintroduced with JDK 1.1    
   
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    Assume you are experiencing a deadlock situation on a java server application ? what is your approach to identify the problem.?    
   
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    What's new with the stop(), suspend() and resume() methods in JDK 1.2?    
   
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    How can u tell HashTable is Synchronized?(IBM-chennai)    
   
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    What happens if a try-catch-finally statement does not have a catch clause to handlean exception that is thrown within the body of the try statement    
   
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    What is layout manager ? How does it work ?
43
    What is the difference between a while statement and a do statement?    
   
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    How does Java handle integer overflows and underflows?    
   
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    What is class loader    
   
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    How can a GUI component handle its own events?    
   
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    How are the elements of a BorderLayout organized?    
   
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    What are wrapper classes?    
   
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    Static functions can call only other static functions and static variables then how does public static void main(String args[]) function is successful to call non-static functions and also non static variables?    
   
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    If a class has two synchronized functions, a thread enters one of the synchronized function, then is it possible for another thread to enter the second synchronized function?    
   
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    Which method of the Component class is used to set the position andsize of a component    
   
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    What is the command to know which version of java you are using?    
   
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    What is the use of voltile specifier    
   
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    What is static class?    
   
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    How is rounding performed under integer division?    
   
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    What is the purpose of a statement block?    
   
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    What is the difference between Iterator and Enumeration    
   
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    Is sizeof a keyword in Java Programming?    
   
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    What are peerless components in Java Programming?    
   
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    What classes of exceptions may be thrown by a throw statement?    
   
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    What is the difference between a field variable and a local variable?    
   
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    Can an anonymous class be declared as implementing an interface and extending a class?
44
    What restrictions are placed on the location of a package statement within asource code file?    
   
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    What's the difference b/w Java command line arg.s & C command line arg.s?    
   
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    Can we send object using Sockets?    
   
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    What is difference in between Java Class and Bean?    
   
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    What do mean by polymorphism, inheritance, encapsulation?    
   
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    How are the elements of a GridBagLayout organized?    
   
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    what are the other ways to prevent a class from being subclassed.one way is to declare the class final. does declaring a class private prevent it from being subclassed?    
   
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    What is user defined exception    
   
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    What is MVC architecture    
   
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    How are the elements of a CardLayout organized?    
   
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    What are the advantages of OOPL?    
   
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    The real time environment , when do we go for abstract class and when do we go for interfaces , can any one please revert back in this regard?    
   
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    How are commas used in the intialization and iteration parts of a for statement?    
   
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    What is the preferred size of a component?    
   
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    What is J2EE    
   
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    What is JFC?    
   
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    What are the Object and Class classes used for?    
   
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    What is Synchronisation in threads    
   
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    How are this() and super() used with constructors?    
   
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    Searching a String
45
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    For which statements does it make sense to use a label?    
   
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    How are Java source code files named?    
   
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    What is the difference between the >> and >>> operators?    
   
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    If a method is declared as protected, where may the method be accessed?    
   
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    Can an object's finalize() method be invoked while it is reachable?    
   
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    What is the order of method invocation in an Applet    
   
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    Can I modify an object in CORBA?    
   
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    What is the interface of thread?    
   
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    What happens in Integer.parseInt() if the thing you pass isn't a number? And does it recognize spelled-out numbers, like "three" ?    
   
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    How all can you free memory    
   
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    What is class variables and instance variables?    
   
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    What are some alternatives to inheritance?    
   
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    Which class is the super class for all classes in java.lang package?    
   
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    What an I/O filter?    
   
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    What are STRUTS    
   
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    What is the relationship between the Canvas class and the Graphics class?    
   
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    What is the primary advantage of XML driven Java Beans    
   
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    What method is used to specify a container's layout?    
   
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    What is meant by flickering?    
   
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    What is the difference between tomact and weblogic
46
    What is your platform's default character encoding?    
   
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    What is it object serialization ?    
   
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    How is serialization implemented in Java    
   
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    In which package are most of the AWT events that support the event-delegation model defined?    
   
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    How does >> operater works ?    
   
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    What is the use of JRE and jar files. what is different between JRE and jar files.    
   
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    Why the container does not support multiple layout managers    
   
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    What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?    
   
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    What is a Java package and how is it used?    
   
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    Threading : - How can you pass data between two threads?    
   
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    How do u create objects at runtime?    
   
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    Is there any tag in HTML to upload and download files?    
   
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    What is the use of keyword transient?    
   
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    What is the difference throw and throws    
   
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    What is the advantage of the event-delegation model over the earlier eventinheritancemodel    
   
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    What is the Vector class?    
   
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    What is a transient variable?    
   
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    What is JIT? Is it bundled with JDK? If so what is the role of interpreter(java)? plz explain in detail.    
   
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    What are the tiers in J2EE architecture    
   
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    What is Collection?
47
    What classes of exceptions may be caught by a catch clause?    
   
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    What method is invoked to cause an object to begin executing as a separatethread?    
   
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    Why do threads block on I/O?    
   
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    What is JAR file    
   
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    In which package are most of the AWT events that support the event-delegationmodel defined    
   
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    What is an abstract method?    
   
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    Which java.util classes and interfaces support event handling?    
   
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    What Checkbox method allows you to tell if a Checkbox is checked?    
   
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    How will you pass parameters in RMI. Why u serialize    
   
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    Are true and false keywords?    
   
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    What are 4 drivers available in JDBC    
   
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    What is JDBC. How do you connect to the Database?    
   
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    Name the eight primitive Java types?    
   
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    Would you like to derive data from a base class    
   
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    What is the capacity of Hashtable()?    
   
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    wat is the disadvantage of threads?    
   
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    What restrictions are placed on method overriding?    
   
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    What is a native method?    
   
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    IS String is a wrapperclass? explain wrapper class    
   
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    How are the elements of a GridBagLayout organized?
48
    1)whether we can set the time implicitly for the garbage collection?    
   
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    How many methods do u implement if implement the Serializable Interface?    
   
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    Is Iterator a Class or Interface? What is its use?    
   
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    What is the Dictionary class?    
   
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    Does a class inherit the constructors of its superclass in Java Programming?    
   
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    How can a GUI component handle its own events in Java Programming?    
   
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    i want to know the difference between these two programs mean the flow /*public class Aquestion { private int i = giveMeJ(); private int j = 10; private int giveMeJ() { return j; } public static void main(String args[]) { System.out.println((new Aquestion()).i); } } */ public class Aquestion { private int j = 10; private int i = giveMeJ(); private int giveMeJ() { return j; } public static void main(String args[]) { System.out.println((new Aquestion()).i); } }    
   
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    Which class is the immediate superclass of the Container class?    
   
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    What is the difference between List, Set and Map?    
   
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    Describe, in general, how java's garbage collector works?    
   
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    What is static variable?    
   
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    How does multithreading take place on a computer with a single CPU    
   
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    is it possible to refer a resource in another webapplication using ServletContext.getRequestDispatcher()? if yes how it can?    
   
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    Why Java is not 100 % pure OOPS    
   
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    How would you keep track of a session    
   
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    If a class is declared without any access modifiers, where may the class be accessed?    
   
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    Explain the Encapsulation principle.    
   
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    How are this and super used?    
   
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    What are the various ways of creating a thread. What is difference between them    
   
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    Why not declare an ArrayList if you want to hold ints?
49
    Will there be a performance penalty if you make a method synchronized? If so, can you make any design changes to improve the performance    
   
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    How We Can We write our own exceptions?    
   
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    What is the difference between equals and ==?    
   
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    we have been taught that whenever an object is created it always invokes a constructor, if not defined in the class then the compiler implicitly invokes it. why??? if there is a parameterized constructor in the class then the compiler does not provide the default constructor why?????    
   
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    Explain the user defined Exceptions?    
   
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    Name four Container classes.Window, Frame, Dialog, FileDialog, Panel, Applet, or ScrollPane?    
   
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    What do you know about the garbate collector?    
   
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    What are synchronized methods and synchronized statements?    
   
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    How can we store elements in arraylist? as by using index or by node?    
   
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    What is the difference between yielding and sleeping?    
   
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    Write program for single objects returns two instances?    
   
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    Name two subclasses of the TextComponent class?    
   
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    What is the functionality of the stub?    
   
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    What is garbage collection    
   
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    Why pointers are not used in java    
   
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    What is the % operator?    
   
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    Which containers use a border Layout as their default layout?    
   
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    Why do you Canvas    
   
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    what will this print int i=10000 System.out.println(i*i); and explain why ?    
   
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    How to Synchronize the HashMap
50
   
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    What is the relationship between a method's throws clause and the exceptionsthat can bethrown during the method's execution?    
   
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    What is the relationship between a method's throws clause and the exceptionsthat can bethrown during    
   
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    what is the difference throw and throws    
   
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    1 Create a class SchoolKid that is the base class for children at a school. It should have attributes for the child?s name and age, the name of the child?s teacher, and a greeting. It should have appropriate accessor and mutator methods for each of the attributes. Derive a class ExaggeratingKid from SchoolKid, as described in the previous exercise. The new class should override the accessor method for the age, reporting the actual age plus 2. It also should override the accessor for the greeting, returning the child?s greeting concatenated with the words ?I am the best.?    
   
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    Which Math method is used to calculate the absolute value of a number?    
   
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    When programmer using the vector and arrylist? and when ur using linkedlist and hashmap and hashtable?    
   
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    Which Math method is used to calculate the absolute value of a number?    
   
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    What is the difference between Abstract class and Interface?    
   
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    What is the difference between the prefix and postfix forms of the ++ operator?    
   
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    When does JIT plays its role. Does JIT come along with jdk? If so then what is role of interpreter?    
   
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    Scope Variables    
   
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    What is client server computing?    
   
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    What is the difference between Application server and Web Server ?    
   
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    How to sort String, for example: abced. to change to abcde ?    
   
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    Is it true the JAVA is realy a plateform indepandent?    
   
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    What is the difference between yielding and sleeping?    
   
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    What must a class do to implement an interface?    
   
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    What is the difference between the File and RandomAccessFile classes?    
   
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    What exactly is volatile & please tell the at what situation we use this key-word and please give an example as well    
   
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    What are the legal operands of the instanceof operator?
51
    How is it possible for two String objects with identical values not to be equalunder the == operator?    
   
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    What restrictions are placed on method overloading?    
   
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    What is a native method?    
   
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    Is sizeof a keyword?    
   
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    What significance of protected Constructors?    
   
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    What is static class    
   
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    What is Collection API?    
   
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    Is a class a subclass of itself?    
   
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    If a class is declared without any access modifiers, where may the class beaccessed    
   
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    Why are the methods of the Math class static?    
   
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    What are the differences between ArrayList and a Vector    
   
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    What is the life cycle of an applet?    
   
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    Is there any set methods to set the background color of our java o/p screen,i.e,after completion of my program ,i want to change my background color of DOS prompt?    
   
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    Which containers use a FlowLayout as their default layout?    
   
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    Which containers use a FlowLayout as their default layout?    
   
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    How are the elements of a GridLayout organized?    
   
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    Imagine there is a class Employee. We create an object of Employee Employee a= New Employee(); If we are giving System.out.println(a); What gets printed?    
   
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    What restrictions are placed on method overriding in Java Programming?    
   
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    Which method of the Component class is used to set the position and size of a component?    
   
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    Why is it often difficult to separate the business layer from the data access layer?
52
    What is numeric promotion?    
   
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    Why we need to serialize the object    
   
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    What is the difference between the paint() and repaint() methods in Java Programming?    
   
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    What is a task's priority and how is it used in scheduling?    
   
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    Does garbage collection guarantee that a program will not run out of memory?    
   
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    What is the difference between java script and java langauge.    
   
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    What is Java Beans?    
   
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    How do we convert the output of the same form basic english language to the global other languages?    
   
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    What is the range of the char type?    
   
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    Please give me answer why we use Interface though it contain only blank implementation    
   
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    What is the functionality of try, catch and finally blocks    
   
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    What is an Abstract Method?    
   
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    In overriding, in super class we declared a method as protected & in sub class we declared that method as private. what happens?    
   
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    What is the difference between a break statement and a continue statement?    
   
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    Is null a keyword?    
   
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    What is the RMI and Socket?    
   
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    What are the different XML files used in J2EE    
   
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    What is the purpose of finalization in Java Programming?    
   
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    What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?    
   
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    What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy in Java Programming?
53
    What does a static inner class mean? How is it different from any other static member    
   
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    Which Java operator is right associative?    
   
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    How does a try statement determine which catch clause should be used to handle an exception?    
   
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    When to use Interface over abstract class?    
   
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    What is the difference between Reader/Writer classes?    
   
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    What is clipping?    
   
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    In overriding, the super class method throws I/O exception & in sub class that method throws arithmetic exception. what happens?    
   
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    What is JAR file    
   
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    What happens when a thread cannot acquire a lock on an object?    
   
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    What are the different types of Synchronization? Is there any other way of method or class or object locking    
   
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    How we can find the total number of processors available in system?    
   
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    Replacing Characters in a String?    
   
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    5. Create a class Rational that represents a rational number. It should have private attributes for ? The numerator (an integer) ? The denominator (an integer) and the following methods: ? Rational(numerator, denominator)?a constructor for a rational number. ? Accessor methods getNumerator and getDenominator and mutator methods setNumerator and setDenominator for the numerator and the denominator. You should use an exception to guarantee that the denominator is never zero.    
   
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    How are this and super used?    
   
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    I there is requirement of creating 1 Million String objects and all will be unique strings, then which of the following will be efficient and why? 1. String X="Student"; 2. String X=new String("Student");    
   
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    What are the Differences between Tread class and Runnable ?    
   
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    What restrictions are placed on method overriding?    
   
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    What is the difference between Process and Threads?    
   
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    How is it possible for two String objects with identical values not to be equalunder the ==operator    
   
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    What an I/O filter?
54
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    What is meant by Servelet. What are the parameters of the service method?    
   
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    What is the difference between Process and Threads    
   
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    How will you initialize an Applet    
   
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    Which characters may be used as the second character of an identifier, but notas the firstcharacter of an identifier    
   
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    In RMI, is the server object first loaded into the memory and then the stub reference is sent to the client or a stub reference is directly sent to the client?    
   
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    What is Collection?    
   
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    can dead thread restart?    
   
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    When we will use an Interface and Abstract class    
   
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    Like Object class is inherited by every class, means every class that you define in java is implicitely extending one class that is Object. Similarly i want to know that which interface is implicitely implemented by every class that we define. let me know as soon as possible.    
   
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    What is the relationship between clipping and repainting?    
   
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    How to check for repeated patterns in a password?    
   
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    Can we serialize the static members?    
   
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    Can an unreachable object become reachable again?    
   
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    what is daemon threads?    
   
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    What is the difference between Delegation event model and Inheritance event model?    
   
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    Can a Byte object be cast to a double value?    
   
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    what is widning and narrowing ?    
   
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    What is the difference between the Boolean & operator and the && operator?    
   
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    What is numeric promotion?    
   
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    What is difference in between Java Class and Bean
55
    In which case i can go for Anonymous class?    
   
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    What is the preferred size of a component?    
   
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    How will you perform transaction using JDBC?    
   
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    How many JVM's we can run in a system?    
   
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    What it the root class for all Java classes    
   
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    What is the ResourceBundle class?    
   
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    Doesn't the compiler always make a no-arg constructor for you?    
   
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    What is the purpose of finalisation?    
   
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    If a variable is declared as private, where may the variable be accessed?    
   
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    What is the purpose of the File class in Java Programming?    
   
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    Which method of the Component class is used to set the position and size of a component?    
   
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    What is JFC    
   
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    How do i upload a file from client side to server side using servlet and jsp this will happen when I click upload button on web-page?    
   
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    How do you know the port number of the server program you want to talk to?    
   
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    How to define an Interface?    
   
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    What is the purpose of the wait(), notify(), and notifyAll() methods?    
   
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    Which Container method is used to cause a container to be laid out and redisplayed?    
   
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    Why multiple inheritace is not supported through classes in java ?    
   
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    How to use printer option in java or is there any method to use print command?    
   
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    Why main method should be declared as public and why in some versions it is mandatory and in some versions it is not mandatory??
56
    Why we cannot define constructor of super class in a sub class ?    
   
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    How can u move/drag a component placed in Swing Container?    
   
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    Does import make my class bigger? Does it actually compile the imported class or package into my code?    
   
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    What are the two basic ways in which classes that can be run as threads may be defined?    
   
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    The following code is executed by a multi-threaded environment: public void functionOne() { System.out.println("Staring itrs= " + this.cntr); for( int i=0; i<this.cntr; i++ ) { System.out.println("iteration: " + i); } System.out.println("completed"); } and when run produces: Starting itrs= 100 iteration: 1 iteration: 2 iteration: 3 iteration: 4 iteration: 5 Give at least one reason why this is happening    
   
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    What happens if a try-catch-finally statement does not have a catch clause to handle an exception that is thrown within the body of the try statement?    
   
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    What are the methods in Object?    
   
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    Can an abstract class be final?    
   
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    What is the List interface?    
   
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    When does the compiler supply a default constructor for a class?    
   
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    What is an RMI?    
   
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    Does Java has pointer?    
   
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    What is socket? and server socket?    
   
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    Under what conditions is an object's finalize() method invoked by the garbage collector?    
   
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    What is the use of Interface?    
   
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    What is bean. Where it can be used?    
   
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    What is abstract method    
   
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    What happens if a try-catch-finally statement does not have a catch clause tohandle anexception that is thrown within the body of the try statement    
   
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    Will class level variables are garbage collected?    
   
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    Is it necessary that there should be only one controller in MVC architechture? and why?
57
    What happens when you invoke a thread's interrupt method while it is sleeping or waiting?    
   
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    What is an Iterator interface?    
   
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    What modifiers may be used with an inner class that is a member of an outer class?    
   
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    What is default Buffersize of any Bufferedclass?    
   
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    What is a transient variable?    
   
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    Why Concept Of Pointer is not there in java    
   
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    How do you handle events in Java?    
   
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    What is Serialization and deserialization?    
   
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    How does serialization work    
   
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    What is a void return type?    
   
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    What is the use of Interface    
   
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    Why clonning method is private? can u overload the main() method. 2)can overload the run() method. 3)what is Common Separated value.    
   
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    Suppose server object is not loaded into the memory, and the client requests for it, what will happen?    
   
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    What are the services in RMI?    
   
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    What is Reflection. Uses of Reflection?    
   
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    Which TextComponent method is used to set a TextComponent to the read-only state?    
   
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    If there are 2 different versions of object streams on disk and only one object definition, how will the JVM reject the wrong one? Can you fool the JVM    
   
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    What are the Object and Class classes used for?    
   
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    What modifiers may be used with an inner class that is a member of an outerclass?    
   
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    let say there are two interfaces like the following interface int1{ int meth1(); } interface int22{ int meth1(); } ok then i am implementing both of them in a calss as follows class mycl implements int1,int2 {} now as the rule says, if a class implements an interface it must complete its signature. now my questions is that if i define meth1(), as that method is in both interface, may i know how can i define both of that methods. please answer me    
58
    What is light weight component?    
   
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    What are the modules in a J2EE application    
   
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    What is a void return type?    
   
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    What is the Collection interface?    
   
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    What is the purpose of finalization?    
   
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    Which Container method is used to cause a container to be laid out andredisplayed    
   
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    Difference between HashMap and TreeMap    
   
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    What is the difference between java and core java    
   
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    What is polymorphism?    
   
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    For what purpose java language is named as java?    
   
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    What is the difference between a Choice and a List?    
   
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    Can an abstract class be final?    
   
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    How can a dead thread be restarted?    
   
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    Are true and false keywords?    
   
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    What is the purpose of finalization?    
   
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    What is the difference between the >> and >>> operators?    
   
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    How to access the values java to javascript?    
   
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    What is the exact difference in between Unicast and Multicast object ? Where we will use ?    
   
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    What is the diffrence between JRE and JVM?    
   
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    In Execption handling What is exactly difference between throws and throw?
59
    What is the statament we need to use particularly when using type2 and type 4 drivers( example for type 1 jdbc.odbc.JdbcOdbcDriver)?    
   
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    Why do you Canvas?    
   
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    Under what conditions is an object's finalize() method invoked by the garbage collector?    
   
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    What is composition?    
   
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    What is the significance of null interface in Java?    
   
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    Which characters may be used as the second character of an identifier, but notas the first character of an identifier?    
   
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    What interface must an object implement before it can be written to a streamas an object?    
   
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    What is the difference between the JDK 1.02 event model and the event delegation model introduced with JDK 1.1?    
   
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    Why do you create interfaces, and when MUST you use one?    
   
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    Why we write server side programs? what is its main purpose?    
   
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    what are the other ways to create an object otherthan creating as new object?    
   
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    Write a program that singleton objects returns two instances?    
   
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    Which TextComponent method is used to set a TextComponent to the readonlystate?    
   
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    How can the Checkbox class be used to create a radio button?    
   
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    What is synchronization and why is it important    
   
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    What is the difference between the paint() and repaint() methods?    
   
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    What is working of bean in EJB    
   
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    what is Uni cast Remote Object?    
   
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    What happens if an exception is not caught?    
   
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    I want to create two instances of a class ,But when trying for creating third instance it should not allow me to create . what i have to do for making this?
60
    What are the Object and Class classes used for?    
   
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    Can there ever be more than one program running on a single port? In other words, can two applications on the same server have the same port number?    
   
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    What methods are used to get and set the text label displayed by a Button object?    
   
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    What advantage do Java's layout managers provide over traditional windowing systems?    
   
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    What is the Map interface?    
   
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    What is garbage collection?    
   
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    Which is superclass of Exception?many people think that object,no there is particular class which is superclass of all exception it starts with letter B,plz tell me    
   
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    How can we inherit the two independent classes in one class? for example, we have two independent classes like Class A and B. I want to inherit the methods of Class A and B.    
   
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    What is multi threading ?    
   
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    When we will use an Interface and Abstract class?    
   
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    Connecting to a Database and Strings Handling    
   
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    Which containers use a FlowLayout as their default layout?    
   
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    What is the difference between Vector, Array and Arraylist    
   
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    What is the difference between a MenuItem and a CheckboxMenu Item?    
   
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    What is the difference between java and c and c++?    
   
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    Create an applet that will draw a number of strings based upon an initial string specified by the user. If the string is n characters long, draw n strings as follows: The first string is the original one that the user typed in a text field. Each subsequent string removes the last character from the previous string. For example, if the user enters the string ?Charles?, the applet would draw Charles Charle Charl Char Cha Ch C Use a text field to get a string from the user. Then draw the strings when the user clicks a Draw button.    
   
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    Which non-Unicode letter characters may be used as the first characterof an identifier?    
   
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    What is the Vector class?    
   
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    Why "bytecode"? Can you reverse-engineer the code from bytecode?    
   
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    Can i know what are methods that a classloader calls when it is loading the class
61
    Is it advisable to depend on finalize for all cleanups    
   
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    Class hierarchy of AbstractMap is as follows "AbstractMap implements Map" Class hierarchy of HashMap is as follows "HashMap extends AbstractMap implements Map" When AbstractMap implements Map interface and AbstractMap is extended by HashMap, what is the use of again implementing Map interface in the declaration of HashMap?.    
   
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    What is the return type of a program's main() method?    
   
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    What is the role of the webserver?    
   
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    Expain about the AJAX technology in Java that is very HOT in software market. What is Jasper Report.?    
   
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    What is the difference between a Vector and an Array. Discuss the advantages and disadvantages of both?    
   
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    Size of object in java : Is there any way in java to find of size of an object ?( like sizeof() operator of C/C++ )    
   
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    What is the difference between String and String Buffer?    
   
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    What interface must an object implement before it can be written to a stream as an object?    
   
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    How are the elements of a CardLayout organized?    
   
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    What is serialization?What is transient?What is the default value of a transient variable?    
   
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    In which package are most of the AWT events that support the event-delegation model defined?    
   
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    What is native method    
   
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    How are this() and super() used with constructors?    
   
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    As the Swings have more advantages over the AWT.. Why still in market are they using AWTs?? plzz..i want answer..in many interviews they asked me the same.    
   
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    wat is the disadvantage of threads?    
   
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    What class of exceptions are generated by the Java run-time system?    
   
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    What is the difference between Classpath and Import    
   
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    What modifiers may be used with an interface declaration?    
   
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    How you can add the 10 days in the current date in jsp?
62
    What is the difference between equals and ==    
   
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    What is final variable    
   
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    What is root class of all java classes    
   
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    In a Container there are 5 components. I want to display the all the components names, how will you do that?    
   
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    What is serialization    
   
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    What is serializable Interface?    
   
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    What is the difference between the File and RandomAccessFile classes?    
   
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    What class allows you to read objects directly from a stream?    
   
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    What do you understand by Synchronization?    
   
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    How are commas used in the initialization and iteration parts of a for statement?    
   
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    What is the catch or declare rule for method declarations?    
   
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    What is the disadvantage of paint method in Applet    
   
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    write classes/methods to calculate the total length of a set of lines given the start and end points taking into account overlapping. E.g. Line 1 start: -1.4, end: 3.2 Line 2 start: 2.9, end: 4.1 etc.. Total length would be: line 1 length = 4.6 line 2 length =1.2, but as line 2 overlaps line 1 by 0.3, therefore length of set is 5.5(rather than 5.8).    
   
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    What is a layout manager?    
   
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    How does applet recognize the height and width.?    
   
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    What advantage do Java?s layout managers provide over traditional windowing systems?    
   
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    A Inner class is defined in a parameterized function of outer class then the inner class is able to access the parameters of that function?    
   
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    Why java is not 100% object oriented language??    
   
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    What are the Normalization Rules. Define the Normalization?    
   
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    Which method of the Component class is used to set the position and size of acomponent
63
    What is the difference between the Boolean & operator and the && operator    
   
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    Why do threads block on I/O    
   
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    What is the difference between C++ & Java?    
   
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    What is the purpose of garbage collection?    
   
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    What is the Dictionary class    
   
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    What happens when you add a double value to a String?    
   
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    Disadvantages of Java    
   
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    What is the highest-level event class of the event-delegation model?    
   
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    How we can implement the constructer nesting in java    
   
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    What is the purpose of the finally clause of a try-catch-finally statement?    
   
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    Can there be an abstract class with no abstract methods in it?    
   
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    What is the difference between Model Data and Default Model Data    
   
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    How can you force all derived classes to implement a method present in the base class?    
   
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    Name the eight primitive Java type.    
   
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    What is the purpose of the File class?    
   
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    How can you force all derived classes to implement a method present in the base class?    
   
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    What are virtual functions    
   
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    What is the difference between scrollbar and scrollpane?    
   
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    What is the Vector class    
   
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    What is inner class?
64
    What is the class containing all the methods as static?    
   
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    What are the differences between AWT and Swing    
   
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    What is typecasting?    
   
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    What classes of exceptions may be caught by a catch clause?    
   
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    what is assert function what are the type how they are used with an example    
   
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    Can a lock be acquired on a class    
   
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    What is the difference between the JDK 1.02 event model and the event-delegation model introduced with JDK 1.1?    
   
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    Which arithmetic operations can result in the throwing of anArithmeticException?    
   
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    What is the difference between preemptive scheduling and time slicing in Java Programming?    
   
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    Where should u use reflection in ur project? give me one example?    
   
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    Imagine there is a class Employee. We create an object of Employee Employee a= New Employee(); If we are giving System.out.println(a); What gets printed?    
   
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    What interface must an object implement before it can be written to a stream as an object?    
   
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    What is a transient variable    
   
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    How does multithreading take place on a computer with a single CPU?    
   
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    What are the objects that are not subject to garbage collection?    
   
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    What interface is extended by AWT event listeners?    
   
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    What about protecting static variable state? If you have static methods that change the static variable state, can you still use synchronization?    
   
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    I can get the size(length) of any array (let a[]) by a.length. please tell me what is this "length" word actually signifies, where it is defined in java and what is its actual definition ?    
   
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    What is the difference between String and StringBuffer    
   
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    What is the diffrence between an Abstract class and Interface
65
    Why does not support multiple Inheritance    
   
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    Which containers use a Flow layout as their default layout?    
   
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    What is the difference between importing a class and creating the object for that class    
   
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    1)what are the other ways to create an object otherthan creating as new object?    
   
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    How big is a reference variable?    
   
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    What event results from the clicking of a button?    
   
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    What is innerclass?    
   
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    How to make jdbc connection a protable without specific drivers    
   
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    What is JNI    
   
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    Who is loading the init() method of servlet?    
   
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    What is Log4j in java    
   
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    Isn't it redundant to have to mark the methods final if the class is final?    
   
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    Why would I want to make a class final? Doesn't that defeat the whole purpose of OO?    
   
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    What are the high-level thread states?    
   
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    What state does a thread enter when it terminates its processing    
   
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    What is innerclass    
   
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    What is the difference in between the HTTPServlet and Generic Servlet. Expalin their methods. Tell me their parameter names too    
   
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    What do you know about the garbate collector    
   
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    What happens if the argument you want ro pass is an object instead of a primitive?    
   
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    what is the difference throw and throws    
   
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66
    Does garbage collection guarantee that a program will not run out of memory    
   
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    What is anonymous class    
   
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    How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8 characters?    
   
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    What is the Vector class    
   
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    What is the difference between applet and application    
   
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    What do you know about networking support in Java ?    
   
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    What is an Object and how do you allocate memory to it?    
   
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    What is the range of the short type?    
   
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    What is the range of the short type    
   
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    What is a task's priority and how is it used in scheduling?    
   
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    What is marker interface?Tell name of atleast three one?    
   
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    what is a green thread?    
   
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    Write the Java code to declare any constant (say gravitational constant) and to get its value.    
   
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    What is the difference between StringBuffer and String class?    
   
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    For which statements does it make sense to use a label?    
   
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    WHAT IS THE DIFFERENCE BETWEEN MULTI-THREADING AND MULTI-PROCESSING?    
   
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    Explain Java Memory Model?    
   
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    What does validate() pack() mean in Frames    
   
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    Why arraylist(and other classes) cantnot be synchronized    
   
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    What is the range of the char type
67
    What is clipping?    
   
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    What is Singleton class    
   
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    Why cant we compare two objects with ==,why we should use only .equals() for objects.    
   
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    What are the disadvantages of using threads?    
   
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    What is singleton?    
   
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    What is the Map interface?    
   
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    Is null a keyword    
   
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    How will you pass values from HTML page to the Servlet    
   
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    What happens if you try to run an executable JAR, and the end-user doesn't have java installed?    
   
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    Can an object be garbage collected while it is still reachable?    
   
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    What is the purpose of the System class?    
   
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    What interface must an object implement before it can be written to a stream as an object?    
   
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    What is a compilation unit?    
   
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    What is your platform's default character encoding?    
   
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    To what value is a variable of the String type automatically initialized?    
   
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    What is the difference between static and non-static variables?    
   
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    What is the use of JRE and jar files. what is different between JRE and jar files.    
   
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    My quetion is about the protected class. it have one super and sub class example , below example i read from one pdf. package certification; public class Parent { protected int x = 9; // protected access } ---------------------------- package other; import certification.Parent; class Child extends Parent { public void testIt() { System.out.println("x is " + x); // No problem; Child inherits x Parent p = new Parent(); // Can we access x using the p reference? System.out.println("X in parent is " + p.x); // Compiler error! } } when i compile this code it dosen't give any error.even though both classes are in diffrent package. but in pdf it mentioned that it gives an error because you are trying to access the protected variable using the instance of the super class if the above code is write then what is logic behind the protected member of super class and if sub class in different package try to access the member of the super class.    
   
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    Name two subclasses of the TextComponent class?    
   
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    What is the notation for matrix in java?
68
    What is the relationship between Home Interface and JNDI?    
   
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    What is user defined exception?    
   
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    What are Transient and Volatile Modifiers?    
   
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    what is widning and narrowing ?    
   
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    What is the difference between string and string buffer?    
   
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    What is difference in between Java Class and Bean    
   
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    What is the difference between a Scrollbar and a ScrollPane?    
   
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    Is null a keyword    
   
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    What is runtime polimorphism? give an example program ?    
   
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    What are wrapper classes    
   
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    What is mutable and immutable in Strings?    
   
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    What restrictions are placed on the values of each case of a switch statement?    
   
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    What is the purpose of the System class in Java Programming?    
   
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    What is the ResourceBundle class?    
   
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    What is the difference between procedural and object-oriented programs?    
   
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    What happens if an exception is not caught?    
   
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    what is the difference between putting a class as abstract or if any of method in class is declared as abstract diference of these two while extending these two types of classes    
   
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    What is the differance between equals() method and ==    
   
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    What is nested class?    
   
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    If we are having Interface A,Interface B,Interface C and Class D where A,B,C are Base classes and D has extended the features of all the three if A,B,C are having totally 5 methods and D has developed only 3 of them what will happen when we compile that program
69
    What is the difference between preemptive scheduling and time slicing?    
   
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    I have been doing the java project using JBuilder 2.0 as front end and oracle 8i as back-end .I can't connect to oracle using JBuilder 2.0 please say detailed code for that coding. whether i have to import extra other than import java.sql.*; when ever i import the import oracle.jdbc.driver.Error"cannot access directory oracle/jdbc/driver".    
   
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    What classes of exceptions may be caught by a catch clause?    
   
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    If i create a object which is to be serialized then do I need to implement any methods?    
   
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    I need some more information about interface. For Example there is no any functionality inside the method which is declared in any interface. Then why i want to implement that interface to my class. 2. Statement is an interface. When i say stmt.executeQuery(). I am getting the records in my ResultSet. How it is possible?.. since there is no functionality insid the methods which is declared in Statement Interface. What is happning here?    
   
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    What is the difference between Assignment and Initialization?    
   
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    What is the difference between .equals and ==?    
   
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    What is the relationship between a method's throws clause and the exceptions that can be thrown during the method's execution?    
   
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    What class allows you to read objects directly from a stream?    
   
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    How can you achieve Multiple Inheritance in Java?    
   
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    What invokes a thread?s run() method in Java Programming?    
   
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    What is the purpose of finalization?    
   
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    What is the difference between runtime polimorphism, and compiletime polimorphism ?    
   
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    How do I instantiate a bean whose constructor accepts parameters using the useBean tag?    
   
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    When can an object reference be cast to an interface reference?    
   
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    Does java do reference counting    
   
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    What is components and controllers in Java    
   
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    Why String is not a primitive data type    
   
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    What is casting in Java Programming?    
   
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    What is the Collections API?
70
    What is the difference between yielding and sleeping    
   
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    How can we emplement strutsframework using jsp or servlets. Tellme.    
   
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    What are abstract classes, abstract methods?    
   
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    What is the difference between the paint() and repaint() methods in Java Programming?    
   
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    What is a "Java Client" ?    
   
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    Why java dosen't support pointers?    
   
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    When a thread is created and started, what is its initial state?    
   
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    Constructor can not be inherited.Why? Tell me the reason.    
   
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    How many threads will be created for a java program, when it is compail & run? and what are they?    
   
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    If a method is declared as protected, where may the method be accessed?    
   
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    Can you write Java code for declaration of multiple inheritance in Java ?    
   
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    Name Container classes in Java Programming?    
   
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    Have you used any version control?    
   
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    What is interface? and what is the purpose of it? Iknow lot of people having problem in this question(even i have it). so i request some good answer to come.I need a good example for the purpose of interface    
   
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    What is Reflection. Uses of Reflection    
   
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    How u can implement hashmap if u r not having in JAVA?    
   
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    Write a static method removeDuplicates(Character[] in) that returns a new array of the characters in the given array, but without any duplicate characters. Always keep the first copy of the character and remove subsequent ones. For example, if in contains b, d, a, b, f, a, g, a, a, and f, the method will return an array containing b, d a, f, and g. Hint: One way to solve this problem is to create a boolean array of the same size as the given array in and use it to keep track of which characters to keep. The values in the new boolean array will determine the size of the array to return    
   
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    How will you add panel to a Frame?    
   
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    What is the purpose of the Runtime class in Java Programming?    
   
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    What is a layout manager?
71
    Given a text file, input.txt, provide the statement required to open this file with the appropriate I/O    
   
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    Can some one pls tell me the exact difference between mutable and immutable ?    
   
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    Which on is best string or string buffer?which one is mutable and immutable?    
   
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    Diff between Application and Applet?    
   
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    What is JavaMail    
   
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    What is JSP?-    
   
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    What is Serialization and Deserialization?    
   
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    Which containers use a Border layout as their default layout?    
   
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    How does multithreading take place on a computer with a single CPU?    
   
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    What is RMI and steps involved in developing an RMI object?    
   
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    What are the classes and interfaces for servlets?    
   
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    What is the difference between constructor and method?    
   
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    What are the types of statements in JDBC?    
   
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    What modifiers may be used with top-level class?    
   
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    What is the lifecycle of an applet?    
   
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    What is Garbage Collection and how to call it explicitly?    
   
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    What type of driver did you use in project?    
   
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    Which containers use a border layout as their default layout?    
   
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    What is the difference between process and thread?    
   
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    How to define an Abstract class?
72
    What are methods and how are they defined?    
   
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    What is interface and its use?    
   
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    What are Encapsulation, Inheritance and Polymorphism?    
   
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    How are this() and super() used with constructors in Java Programming?    
   
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    What is the difference between set and list?    
   
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    What are wrapper classes?    
   
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    What is adapter class?    
   
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    What are the states associated in the thread.?    
   
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    What method is used to specify a container?s layout in Java Programming?    
   
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    What is a cloneable interface and how many methods does it contain?    
   
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    What is method overloading and method overriding?    
   
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    What are Class, Constructor and Primitive data types?    
   
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    Explain the methods, rebind() and lookup() in Naming class?    
   
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    What is RMI architecture?-    
   
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    What is Inet address?-    
   
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    What is the difference between JDBC and ODBC?    
   
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    What are cookies and how will you use them?-    
   
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    What is meant by controls and what are different types of controls in AWT?    
   
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    What is difference between portletContext and request object?    
   
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    How are the elements of different layouts organized?
73
    What is the difference between choice and list?    
   
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    When do you use codebase in applet?    
   
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    What is multithreading and what are the methods for inter-thread communication and what is the class in which these methods are defined?    
   
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    What is finalize() method?    
   
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    What is UNICODE?    
   
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    What are JSP scripting elements?    
   
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    What is BDK?    
   
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    What is the base class for Error and Exception?    
   
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    What is a transient variable?    
   
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    How are Observer and Observable used in Java Programming?    
   
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    What is synchronization and why is it important in Java Programming?    
   
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    What are synchronized methods and synchronized statements in Java Programming    
   
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    What are three ways in which a thread can enter the waiting state in Java Programming?    
   
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    Can a lock be acquired on a class in Java Programming?    
   
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    What is the difference between abstract class and interface?    
   
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    What is difference between overloading and overriding?    
   
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    Name Component subclasses that support painting in Java Programming?    
   
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    What is a native method in Java Programming?    
   
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    How can you write a loop indefinitely in Java Programming?    
   
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    Can an anonymous class be declared as implementing an interface and extending a class in Java Programming?    
74
    What restrictions are placed on method overloading in Java Programming?    
   
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    How does multithreading take place on a computer with a single CPU in Java Programming?    
   
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    What is the difference between Reader/Writer and InputStream/Output Stream?    
   
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    What is OOPs?    
   
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    What are the problems faced by Java programmers who don?t use layout managers?    
   
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    7. Write an applet to display a solid circle that fits perfectly Inside the outline of a square. 8. Write a program to implement producer consumer problem in java using multithreading.    
   
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    What is a Jar file?    
   
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    What is a stream and what are the types of Streams and classes of the Streams?    
   
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    What are Vector, Hashtable, LinkedList and Enumeration?    
   
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    How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8 characters in Java Programming?    
   
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    What is casting?    
   
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    How many ways can we track client and what are they?    
   
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    Is it possible to call servlet with parameters in the URL?    
   
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    What is Servlet chaining?    
   
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    What is the class and interface in java to create thread and which is the most advantageous method?    
   
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    What is the major difference between LinkedList and ArrayList?    
   
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    What is the List interface in Java Programming?    
   
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    What modifiers may be used with an inner class that is a member of an outer class in Java Programming?    
   
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    What are Predefined variables or implicit objects?    
   
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    How do you pass data (including JavaBeans) to a JSP from a servlet ?
    What are the types of JDBC Driver Models and explain them?    
   
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    Is it possible to communicate from an applet to servlet and how many ways and how?    
   
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    How do servlets handle multiple simultaneous requests?    
   
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    Actually we cannot create instance for interface. but we can create instance for interface in abstract working toolkit how it is possible?    
   
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    What are the steps involved for making a connection with a database or how do you connect to a database?    
   
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    Are there any global variables in Java, which can be accessed by other part of your program?    
   
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    What is daemon thread and which method is used to create the daemon thread?    
   
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    What is deadlock?    
   
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    What are different types of access modifiers?    
   
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    What is the SimpleTimeZone class in Java Programming?    
   
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    Name primitive Java types?    
   
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    What is the purpose of the File class in Java Programming?    
   
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    What is mean by re throw in Exception Handling?    
   
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    Why should we go for interservlet communication?    
   
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    Which Container method is used to cause a container to be laid out and redisplayed in Java Programming?    
   
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    What is source and listener?    
   
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    What is the difference between exception and error?    
   
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    What is the difference between Integer and int?    
   
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    What is an abstract class?    
   
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    What is the Collections API in Java Programming?
    What is a reflection package?    
   
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    What is the Vector class in Java Programming?    
   
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    What is the difference between superclass and subclass?    
   
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    What is the difference between this() and super()?    
   
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    What is the use of bin and lib in JDK?    
   
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    What is the difference between the Boolean & operator and the && operator in Java Programming?    
   
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    Which package has light weight components in Java Programming?    
   
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    What happens when a thread cannot acquire a lock on an object in Java Programming?    
   
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    Is it possible to run java program without main method ?    
   
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    What is the difference between an applet and a servlet?    
   
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    What is the life cycle of a servlet?    
   
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    What is an applet?    
   
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    What is the purpose of the Runtime class in Java Programming?    
   
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    What is the Properties class in Java Programming?    
   
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    Name primitive Java types?    
   
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    What is UNICODE?    
   
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    What is stored procedure?    
   
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    What is Server-Side Includes (SSI)?    
   
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    What are the advantages of the model over the event-inheritance model?    
   
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    What is the difference between applications and applets?
77
    When you will synchronize a piece of your code?    
   
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    What is synchronization?    
   
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    Can you have an inner class inside a method and what variables can you access?    
   
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    What is meant by Inheritance and what are its advantages?    
   
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    Does garbage collection guarantee that a program will not run out of memory?    
   
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    What is final, finalize() and finally?    
   
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    How many ways can an argument be passed to a subroutine and explain them?    
   
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    Which class is the superclass for every class in Java Programming?    
   
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    What is the purpose of the System class in Java Programming?    
   
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    What is the difference between the Font and FontMetrics classes in Java Programming?    
   
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    What are JSP Directives?    
   
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    How are Servlets and JSP Pages related?    
   
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    What is a Java Bean?    
   
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    What are the different servers available for developing and deploying Servlets?    
   
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    What is session tracking and how do you track a user session in servlets?    
   
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    What is the difference between TCP/IP and UDP?    
   
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    How do you set security in applets?    
   
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    What is the difference between Array and vector?    
   
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    What is a package?    
   
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    What are wrapped classes in Java Programming?
78
    What is the purpose of the finally clause of a try-catch-finally statement in Java Programming?    
   
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    What is the Map interface in Java Programming?    
   
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    What is URL?    
   
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    What is Domain Naming Service(DNS)?    
   
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    What is JDBC?    
   
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    What is the preferred size of a component in Java Programming?    
   
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    How does Java handle integer overflows and underflows?    
   
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    What are inner class and anonymous class?    
   
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    What is an Iterator interface in Java Programming?    
   
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    What is a native method in Java Programming?    
   
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    What is the difference between an argument and a parameter?    
   
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    What is the GregorianCalendar class in Java Programming?    
   
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    Which Container method is used to cause a container to be laid out and redisplayed in Java Programming?    
   
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    If a class is declared without any access modifiers, where may the class be accessed in Java Programming?    
   
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    How are the elements of a GridBagLayout organized in Java Programming?    
   
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    What is the difference between static and non-static variables in Java Programming?    
   
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    How does multithreading take place on a computer with a single CPU in Java Programming?    
   
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    What is the difference between the paint() and repaint() methods in Java Programming?    
   
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    why does not a float variable accomodate with decimal point in java?    
   
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    What is an I/O filter?
79
    What are drivers available?    
   
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    What is an event and what are the models available for event handling?    
   
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    What is JIT and its use?    
   
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    What?s new with the stop(), suspend() and resume() methods in JDK 1.2?    
   
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    Which containers use a FlowLayout as their default layout in Java Programming?    
   
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    What state does a thread enter when it terminates its processing in Java Programming    
   
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    What is the Properties class in Java Programming?    
   
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    What is the purpose of the finally clause of a try-catch-finally statement in Java Programming?    
   
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    How can I set a cookie in JSP?    
   
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    What are JSP ACTIONS?    
   
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    What is serialization and deserialization?    
   
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    What is servlet?    
   
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    What is the difference between doPost and doGet methods?    
   
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    What is connection pooling?    
   
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    How will you invoke any external process in Java? -    
   
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    What is mutable object and immutable objec    
   
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    What is the basic difference between string and stringbuffer object    
   
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    What is the purpose of Void class?    
   
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    What is reflection?    
   
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    What are the approaches that you will follow for making a program very efficient?
80
    What is a DatabaseMetaData?    
   
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    What is Locale?    
   
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    What is the purpose of assert keyword used in JDK1.4.x?    
   
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    How will you get the platform dependent values like line separator, path separator, etc., ?    
   
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    What is skeleton and stub? what is the purpose of those?    
   
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    What is the final keyword denotes?    
   
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    What is the difference between static and non-static variables in Java Programming?    
   
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    How to create and call stored procedures?    
   
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    What is garbage collection? What is the process that is responsible for doing that in java?    
   
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    What kind of thread is the Garbage collector thread?

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