设计模式-单例模式

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package com.fish;// 饿汉单例模式  **线程安全**public class Singleton {private Singleton() {System.out.println("Singleton被加载");}private static Singleton instance = new Singleton();public static Singleton getInstance() {System.out.println("Singleton实例生成");return instance;}public static void main(String args[]) {Singleton s1 = Singleton.getInstance();Singleton s2 = Singleton.getInstance();if(s1==s2) {System.out.println("s1和s2是同一对象");}}}

package com.fish;// 懒汉单例模式 **线程不安全**public class Singleton2 {private Singleton2() {System.out.println("Singleton2被加载");}private static Singleton2 instance;public static Singleton2 getInstance() {if(instance==null) {instance = new Singleton2();}System.out.println("Singleton2实例生成");return instance;}public static void main(String args[]) {Singleton2 s1 = Singleton2.getInstance();Singleton2 s2 = Singleton2.getInstance();if(s1==s2) {System.out.println("s1和s2是同一对象");}}}

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