package com.basic;

import java.util.Arrays;

/**

* @program JavaBooks

* @description: 单例，内部类方式，不需要加锁

* @author: mf

* @create: 2019/12/31 11:17

*/

public class T18 {

private T18() {

System.out.println("single");

}

private static class Inner {

private static T18 s = new T18();

}

private static T18 getSingle() {

return Inner.s;

}

public static void main(String[] args) {

Thread[] ths = new Thread[100];

for (int i = 0; i < ths.length; i++) {

ths[i] = new Thread(() -> {

T18.getSingle();

});

}

Arrays.asList(ths).forEach(o -> o.start());

}

}