package com.ub.linkedin; public class Singleton { private static Singleton Instance = null; private Singleton() { // if(Instance == null) { // Instance = new Singleton(); // } } public static Singleton getInstance() { if(Instance == null) { Instance = new Singleton(); } return Instance; } private int getValue(int n) { return n; } public static void main(String args[]) { Singleton s; s = Singleton.getInstance(); System.out.println(s.Instance.getValue(12) ); } }