集合的线程安全

Posted 2023-02-15 weixin_ancenhw

Vector
Collections
CopyOnWriteArrayList 写时复制技术

public static void main(String[] args) 
        //会出现并发修改错误java.util.ConcurrentModificationException
        //List<String> list = new ArrayList<>();
        //jdk 1.0的方法类
        //List<String> list = new Vector<>();
        //推荐做法，实现数据同步加锁机制
        List<String> list = new CopyOnWriteArrayList<>();
        for (int i = 0; i < 30; i++) 
            new Thread(()->
                list.add(UUID.randomUUID().toString());
                System.out.println(list);
            ,"线程"+i).start();