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Writing an object of base class should do the needful..

class A{
public static synchronized void main(String args[]){
Thread t= new Thread();
t.start();
System.out.println("hi");
t.wait(1000);
System.out.println("hello");
}}

Class A{
Public static synchronized void main(String args[]){
Thread t= new thread();
t.start();
Sysout("hi");
t.wait(1000);
Sysout("hello");
}}

Why is HttpServlet serializable? Do we need to serialize the controllers in our web-application? Pros of it?