单例模式_demo

参考：(15条消息) 单例模式Demo_zixing08的博客-CSDN博客

单例模式详细解析 - 知乎 (zhihu.com)

Singleton.java

package com.hmb;

public class Singleton {
    private static class MySingleton {
        private static Singleton singleton = new Singleton();
    }

    public static Singleton getInstance() {
        return MySingleton.singleton;
    }
}

 

　　

Main.java

package com.hmb;

import com.hmb.Singleton;

public class Main {
    public static void main(String[] args) {
        for (int i = 0; i < 100; i++) {
            new Thread(() -> {
                System.out.println(Thread.currentThread().getName() + " " + Singleton.getInstance().hashCode());
            }).start();
        }
    }
}

执行结果