gistfile1.txt

class Singleton { 
    private volatile static Singleton object; 
  
    private Singleton() {} 
  
    public static Singleton getInstance() { 
        if (object == null) { 
            synchronized (Singleton.class) { 
               if (object == null) 
                    object = new Singleton(); 
            } 
        } 
        return object; 
    } 
}