import java.util.*;
import java.lang.*;

class Main
{
	 public static void main(String []args){
        final Node<Number> n =  new Node<Number>(new Integer(666));
        System.out.println(n.get());
        n.set(new Integer(777));
        System.out.println(n.get());
     }
     public static class Node<E>{
        private E data;
        public Node(E data){
            this.data=data;
        }
        public E get(){
            return this.data;
        }
        public void set(E data){
            this.data=data;
        }
    }
}