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The easiest implementation consists of a private constructor and a field to hold its result, and a static accessor method with a name like getInstance().

The private field can be assigned from within a static initializer block or, more simply, using an initializer. The getInstance( ) method (which must be public) then simply returns this instance:

// File Name: Singleton.java
public class Singleton {

   private static Singleton singleton = new Singleton( );
   
   /* A private Constructor prevents any other 
    * class from instantiating.
    */
   private Singleton(){ }
   
   /* Static 'instance' method */
   public static Singleton getInstance( ) {
      return singleton;
   }
   /* Other methods protected by singleton-ness */
   protected static void demoMethod( ) {
      System.out.println("demoMethod for singleton"); 
   }
}

// File Name: SingletonDemo.java
public class SingletonDemo {
   public static void main(String[] args) {
      Singleton tmp = Singleton.getInstance( );
      tmp.demoMethod( );
   }
}

Hi,
Can you please explain Bridge and Adapter pattern?

How can u implement the same in C++. Plz give some idea.

01 public class MyClass{
02 private static MyClass instance = null;
03
04 private MyClass(){
05 }
06
07 public synchronized static MyClass getInstance(){
08 if ( instance == null ){
09 instance = new MyClass();
10 }
11
12 return instance;
13 }
14 }

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Using the Synchronized is very costly.

public class Singleton {
private static Singleton uniqueInstance = new Singleton();

private Singleton(){}

public static Singleton getInstance(){
System.out.println(uniqueInstance.hashCode());
return uniqueInstance;
}


}

public class TestSingleton {

public static void main(String[] args) {
Singleton.getInstance();
}

}