Singleton Design Pattern implementation in Java

clipped from cstechie.com Singleton Design Pattern implementation in Java Ensure a class has only one instance and provides a global point of access to it Useful when exactly one instance of a class is needed to coordinate actions Abstract Factory,Prototype and Builder can use Singleton in their implementation Often preffered as global variables -Provides OO Design scope,Allows lazy initialization or dynamic change in behaviour Facade objects and State objects are often SIngletons