package test2;

import java.util.concurrent.CopyOnWriteArrayList;

//测试GUC安全类型的集合
public class TestGUC {
    public static void main(String[] args) {

        CopyOnWriteArrayList<String> list=new CopyOnWriteArrayList<String>();//这个类本来就是安全的
        for (int i = 0; i < 1000; i++) {
            new Thread(()->{
                list.add(Thread.currentThread().getName());
            }).start();
        }

        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println(list.size());



    }
}

CopyOnWriteArrayList类