为什么interrupt（）没有按预期工作，它是如何工作的 [英] why interrupt() not work as expected and how does it work

问题描述

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

I want to interrupt a thread, but invoke interrupt() seems not 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();
            }
        }
    }
}

但是输出看起来像thead1仍然在运行。所以任何人都可以解释一下，interrupt（）如何工作，谢谢

but the output looks like thead1 is still running. So could anyone explain it, how interrupt() works, thanks

推荐答案

线程仍在运行只是因为你抓住了 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（）。它还会导致一些方法 - sleep（）， join Object.wait（），特别是 - 通过抛出 InterruptedException 立即返回。它还会导致某些I / O操作立即终止。如果您从 catch 块中看到打印输出，那么您可以看到 interrupt（）正在运行。

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.

这篇关于为什么interrupt（）没有按预期工作，它是如何工作的的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！