一 源码分析

// interrupted 最终会调用 isInterrupted，但传入参数为 true，表示要擦除中断标识
public static boolean interrupted() {
    return currentThread().isInterrupted(true);
}
// isInterrupted 最终会调用 isInterrupted，但传入参数为 false，表示不擦除中断标识
public boolean isInterrupted() {
    return isInterrupted(false);
}

private native boolean isInterrupted(boolean ClearInterrupted);

二 思考

如果一线程被中断后，再去执行可中断方法，会怎么样呢？我们不妨测试一下。

package concurrent;

import java.util.concurrent.TimeUnit;

public class ThreadInterrpt1 {
    public static void main(String[] args) {
        // 判断当前线程是否中断
        System.out.println("Main thread is interruputed?" + Thread.interrupted());
        // 中断当前线程
        Thread.currentThread().interrupt();
        // 中断当前线程
        System.out.println("Main thread is interruputed?" + Thread.currentThread().isInterrupted());
        // 当前线程执行可中断方法

        try {
            TimeUnit.MINUTES.sleep(1);
        } catch (InterruptedException e) {
            System.out.println("捕获中断信号");
            // 中断后，擦除中断标识
            System.out.println("Main thread is interruputed?" + Thread.currentThread().isInterrupted());
        }
    }
}

三 测试

Main thread is interruputed?false

Main thread is interruputed?true

捕获中断信号

Main thread is interruputed?false