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Classe Singleton

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Classe Singleton

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  1. public class Singleton {
  2. 	private static Singleton istance = null; // riferimento all'istanza
  3.  
  4. 	private Singleton() { } // costruttore
  5.  
  6. 	public static Singleton getIstance() {
  7. 		if(istance==null)
  8. 			synchronized(Singleton.class) {
  9. 				if(instance == null)
  10. 					istance = new Singleton();
  11. 				}
  12. 		return istance;
  13. 	}
  14.  
  15. 	public void metodo() { ... }
  16. 	....
  17. }
  18.  
  19. ...
  20. Singleton sg1 = Singleton.getIstance(); // Crea l'istanza
  21. sg1.metodo();
  22. ...

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