中断()未按预期工作(中断如何工作?) [英] interrupt() not working as expected (how does interrupt work?)

问题描述

我想中断一个线程，但调用 interrupt() 似乎不起作用.下面是示例代码:

I want to interrupt a thread, but invoking interrupt() doesn't seem to work. Below is the sample code:

public class BasicThreadrRunner {
    public static void main(String[] args) {
        Thread t1 = new Thread(new Basic(), "thread1");
        t1.start();
        Thread t3 = new Thread(new Basic(), "thread3");
        Thread t4 = new Thread(new Basic(), "thread4");
        t3.start();
        t1.interrupt();
        t4.start();
    }
}
class Basic implements Runnable{
    public void run(){
        while(true) {
            System.out.println(Thread.currentThread().getName());
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                System.err.println("thread: " + Thread.currentThread().getName());
                //e.printStackTrace();
            }
        }
    }
}

但输出看起来线程 1 仍在运行.谁能解释这个以及 interrupt() 是如何工作的?谢谢！

but the output looks like thread 1 is still running. Can anyone explain this as well as how interrupt() works? Thanks!

推荐答案

线程仍在运行仅仅是因为您捕获 InterruptedException 并继续运行.interrupt() 主要在 Thread 对象中设置一个标志，您可以使用 isInterrupted() 进行检查.它还导致一些方法——特别是sleep()、join Object.wait()——通过抛出一个<代码>中断异常.它还导致一些 I/O 操作立即终止.如果您看到 catch 块的打印输出，那么您可以看到 interrupt() 正在工作.

The thread is still running simply because you catch InterruptedException and keep running. interrupt() primarily sets a flag in the Thread object, which you can check with isInterrupted(). It also causes some methods -- sleep(), join Object.wait(), in particular -- to return immediately by throwing an InterruptedException. It also causes some I/O operations to immediately terminate. If you're seeing the printouts from your catch block, then you can see that interrupt() is working.

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