Question

我观察到一个奇怪的现象，即提交任务后Thread.interruptted()的值发生了变化，让我用代码来解释它。

package com.example;

import com.google.common.util.concurrent.ThreadFactoryBuilder;
import java.util.concurrent.*;

public class TestClass {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(3, 3,
                0L, TimeUnit.MILLISECONDS,
                new LinkedBlockingQueue<Runnable>()
                , new ThreadFactoryBuilder().setNameFormat("ThreadTest-%d").build(),
                new ThreadPoolExecutor.AbortPolicy()
        );

        Thread.currentThread().interrupt();
        System.out.println("ThreadTest interrupted: " + Thread.interrupted());
        Future<String> future;
        future = threadPoolExecutor.submit(() -> {
            System.out.println("running thread");
            return "done";
        });
        System.out.println("ThreadTest interrupted: " + Thread.interrupted());
        String s = future.get();
        System.out.println("ThreadTest result: " + s);
    }
}

运行它，我得到以下输出：

ThreadTest interrupted: true
ThreadTest interrupted: false
running thread
ThreadTest result: done

我的问题是，我已经中断了主线程，为什么在提交任务后它又变回不中断？是JDK中的错误吗？

我正在使用macOS，而我的Java版本如下：

java version "1.8.0_151"
Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)

Answer 1

https://docs.oracle.com/javase/tutorial/essential/concurrency/interrupt.html：

当线程通过调用静态方法检查中断时 Thread.interrupted，中断状态已清除。

https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html#interrupted()：

该方法清除了线程的中断状态。

在问问题之前，请先阅读文档。

提交任务后更改Thread.interrupted

1 个答案: