Write a singleton program

public class SingletonObject
{
  private SingletonObject()
  {
    // no code req'd
  }

  public static synchronized
 SingletonObject getSingletonObject()
  {
    if (ref == null)
        // it's ok, we can call this constructor
        ref = new SingletonObject();       
    return ref;
  }

  public Object clone()
    throws CloneNotSupportedException
  {
    throw new CloneNotSupportedException();
    // that'll teach 'em
  }

  private static SingletonObject ref;
}


public class Clone
{
    public static void main(String args[])
      throws Exception
    {
      // Get a singleton
      SingletonObject obj =
      SingletonObject.

getSingletonObject();

     
      SingletonObject clone =
        (SingletonObject) obj.clone();
    }
}