Pre Initialized Singleton 

This example shows creating a simple singleton. Singletons provides a mechanism to have a single instance of a class throughout the life cycle of the Application. It ensures a class has only one instance and provides a global point of access to it.

File Name  :   com/bethecoder/tutorials/dp/singleton/pre/Singleton.java  Author  :   Sudhakar KV Email  :   [email protected]

package com.bethecoder.tutorials.dp.singleton.pre; public class Singleton {   /**    * Pre-initialized singleton.    */   private static final Singleton instance = new Singleton();      /**    * Make sure to have private default constructor.    * This avoids direct instantiation of class using     * new keyword/Class.newInstance() method    */   private Singleton() {     init();   }      private void init() {     //Initialization code    }      public static Singleton getInstance() {     return instance;   } }

File Name  :   com/bethecoder/tutorials/dp/singleton/pre/Test.java  Author  :   Sudhakar KV Email  :   [email protected]

package com.bethecoder.tutorials.dp.singleton.pre; public class Test {      public static void main (String [] args) {          System.out.println(Singleton.getInstance());     System.out.println(Singleton.getInstance());   } }

com.bethecoder.tutorials.dp.singleton.pre.Singleton@250e250e
com.bethecoder.tutorials.dp.singleton.pre.Singleton@250e250e