java - 我如何理解 Thread.interrupt()？

Question

java中有两个代码块。

block 一:

@Test
public void test1() {

    System.out.println("interrupt:" + Thread.currentThread().isInterrupted());
    Thread.currentThread().interrupt();
    System.out.println("interrupt:" + Thread.currentThread().isInterrupted());

}

输出:

interrupt:false
interrupt:true

第二 block :

@Test
public void test2() throws InterruptedException {
    Thread thread = new Thread(new Runnable() {
        @Override
        public void run() {
            System.out.println("running...");
        }
    });

    thread.interrupt();

    TimeUnit.SECONDS.sleep(2);

    System.out.println("interrupt:" + thread.isInterrupted());

    thread.start();

    TimeUnit.SECONDS.sleep(2);

    System.out.println("interrupt:" + thread.isInterrupted());

}

输出:

interrupt:false
running...
interrupt:false

所以，我的问题:

1. 为什么在调用 interrupt() 后阻塞一个打印 interrupt:true 但不阻塞两个？
2. JVM 在调用 interrupt() 后会做什么？

谢谢!

附言:第三 block :

@Test
public void test3() {
    Thread thread = new Thread(new Runnable() {
        @Override
        public void run() {
            System.out.println("running...");
        }
    });

    thread.interrupt();

    System.out.println("interrupt:" + thread.isInterrupted());

    // thread.start();
    //
    // thread.interrupt();
    //
    //
    // System.out.println("interrupt:" + thread.isInterrupted());

}

同时输出:interrupt:false

Answer 1

• 在 block 1 中，您自己打断，这会用中断标记“标记”线程。
• 在 block 2 中，您中断了其他线程(不活动 - 未启动 -)

尝试在 run() 方法中添加 Thread.sleep(5000);并在中断前开始 ;-)

How interrupt works