hi friend,

import java.io.*;

public class SingletonExam implements Serializable {

public static SingletonExam single;

protected SingletonExam(){
// Exists only to thwart instantiation.
}

private Object readResolve(){
return single;
}

public static void main(String args[]){
System.out.println("welcome back");
single = new SingletonExam();
single.readResolve();

}
}


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Read for more information.

http://www.roseindia.net/javatutorials/J2EE_singleton_pattern.shtml

Thanks