Singleton (See related posts)

public class MySingleton {
    private static final MySingleton INSTANCE = new MySingleton();

    private MySingleton() {}

    public static final MySingleton getInstance() {
      return INSTANCE;
    }
	 
	/**
	* Normal deserialization returns a new instance of an object. This ensures that only one instance is in existence. 
         * Deserialization can either create a new instance and leave the deserialized object to be garbage collected or
         * reuse the deserialized instance.
	*/
	private Object readResolve() throws ObjectStreamException {
	  return INSTANCE;
	}
}