18、多线程：CopyOnWriteArrayList是线程安全的

学习过程观看视频：[狂神说Java]
https://www.bilibili.com/video/BV1V4411p7EF?p=3
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java代码

package com.zjl;

import java.util.concurrent.CopyOnWriteArrayList;

/**
 * Created by zjl
 * 2020/11/18
 **/
public class TestJUC {
    public static void main(String[] args) {
        CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
        for (int i = 0; i < 10000; i++) {
            new Thread(()->{
               list.add(Thread.currentThread().getName());
            }).start();
        }
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(list.size());
    }
}

输出结果：