//懶漢式，線程安全 public class Singleton5 {private static volatile Singleton5 singleton;private Singleton5(){}//雙重檢查public static Singleton5 getInstance(){if(singleton == null){synchronized (Singleton5.class){if ((singleton == null)){singleton = new Singleton5();}}}return singleton;}public static void main(String[] args) {Singleton5 instance1 = Singleton5.getInstance();Singleton5 instance2 = Singleton5.getInstance();System.out.println(instance1 == instance2);System.out.println("****");System.out.println(instance1.hashCode());System.out.println(instance2.hashCode());} }

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