这一章节我们来讨论一下线程的停止,由于线程的停止方法stop,suppend,resume已经弃用,因此不推荐,现在只能够使用interrupt,但是这个方法只是标记一下这个线程已经停止,没有实质性的停下来的。
1.代码清单
package com.ray.deepintothread.ch01.topic_5;public class InterruptSample {public static void main(String[] args) throws InterruptedException {ThreadFive threadFive = new ThreadFive();Thread thread = new Thread(threadFive);thread.start();}
}class ThreadFive extends Thread {@Overridepublic void run() {for (int i = 0; i < 10; i++) {if (i == 3) {Thread.currentThread().interrupt();}System.out.println("interrupt:" + Thread.currentThread().isInterrupted());try {sleep(50);} catch (InterruptedException e) {System.out.println("catch interrupt:" + Thread.currentThread().isInterrupted());}}super.run();}
}
输出:
interrupt:false
interrupt:false
interrupt:false
interrupt:true
catch interrupt:false
interrupt:false
interrupt:false
interrupt:false
interrupt:false
interrupt:false
interrupt:false
2.结论
在这里我们先别看catch里面的语句,我们后面将说到这个情况,从其他输出可以看见,interrupt之后,该执行的还是执行,一点改变都没有。
3.在java的方法里面,提供了两个检测中断的方法,下面来对比一下
package com.ray.deepintothread.ch01.topic_5;public class InterruptSample2 {public static void main(String[] args) {System.out.println("--------------------------");Thread.currentThread().interrupt();System.out.println(Thread.interrupted());System.out.println(Thread.interrupted());System.out.println(Thread.currentThread().isInterrupted());System.out.println(Thread.currentThread().isInterrupted());System.out.println("--------------------------");Thread.currentThread().interrupt();System.out.println(Thread.currentThread().isInterrupted());System.out.println(Thread.currentThread().isInterrupted());System.out.println("--------------------------");Thread.currentThread().interrupt();System.out.println(Thread.interrupted());System.out.println(Thread.interrupted());}
}
输出:
--------------------------
true
false
false
false
--------------------------
true
true
--------------------------
true
false
从输出可以看见,interrupted()在检测一次之后就把标记给去掉,但是isInterrupted()却不会去掉这个中断标记。
总结:这一章节我们介绍了interrupt()和isInterrupt(),注意一点,interrupt()是不能够停止线程的。
我的github:https://github.com/raylee2015/DeepIntoThread