Java线程中interrupt，看一个例子都懂了

    Thread类中有3个与interrupt相关的方法，像三胞胎一样，初学者傻傻分不清楚，举了个例子，看完就懂。

直接上代码，看注释。

public class InterruptTaskTest {
 
    public static void main(String[] args) {
        System.out.println(Thread.currentThread() + " isInterrupted() 1: " + Thread.currentThread().isInterrupted());  // 初始false
 
        Thread.currentThread().interrupt(); // 执行后true
        System.out.println("--interrupt() 1"); // 无异常产生
        System.out.println(Thread.currentThread() + " isInterrupted() 2: " + Thread.currentThread().isInterrupted());
 
        Thread.interrupted();  // 执行后false，重置了状态
        System.out.println("++++++interrupted() 1");
        System.out.println(Thread.currentThread() + " isInterrupted() 3: " + Thread.currentThread().isInterrupted());
 
        InterruptTask task = new InterruptTask(3000); // 定时延迟3秒后，对当前线程interrupt()
 
        while (!Thread.interrupted()) { // 这时为false可以进入循环
            try {
                TimeUnit.SECONDS.sleep(2);
            } catch (InterruptedException e) {
                System.out.println("--interrupt() 2，异常信息：" + e.getMessage());  // 对sleep状态线程中断有异常
                System.out.println(task.target + " isInterrupted() 4: " + task.target.isInterrupted()); // 这时还为fasle，中断sleep线程特殊
                Thread.currentThread().interrupt();  // 必须在interrupt()一次，才能跳出循环
                System.out.println("--interrupt() 3"); // 无异常产生
                System.out.println(task.target + " isInterrupted() 5: " + task.target.isInterrupted()); // 这时为true，终止后面循环
            }
        }
 
        task.cancel();
        System.out.println("over！");
    }
}

代码在jdk1.8执行结果：

Thread[main,5,main] isInterrupted() 1: false
--interrupt() 1
Thread[main,5,main] isInterrupted() 2: true
++++++interrupted() 1
Thread[main,5,main] isInterrupted() 3: false
--interrupt() 2，异常信息：sleep interrupted
Thread[main,5,main] isInterrupted() 4: false
--interrupt() 3
Thread[main,5,main] isInterrupted() 5: true
over！

有帮助到你的话，敲个👍。