CopyOnWriteArrayList

HeJin小于 1 分钟Java多线程详解

java.util.concurrent包下。CopyOnWriteArrayList是线程安全的。

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());
    }
}

10000

Process finished with exit code 0