单例设计模式-java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | /** * 饿汉式 */ class SingletonHungery{ private static SingletonHungery s = new SingletonHungery(); private SingletonHungery(){ } public static SingletonHungery getInstance(){ return s; } } /** * 懒汉式 */ class SingletonLazy{ private static SingletonLazy s; private SingletonLazy(){ } public static SingletonLazy getInstance(){ if (s == null ) { s = new SingletonLazy(); } return s; } } public class SingletonDemo { public static void main(String[] args) { SingletonHungery s1 = SingletonHungery.getInstance(); SingletonHungery ss1 = SingletonHungery.getInstance(); System.out.println(s1 == ss1); SingletonLazy s2 = SingletonLazy.getInstance(); SingletonLazy ss2 = SingletonLazy.getInstance(); System.out.println(s2 == ss2); } } |
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