Android Thread interrupt 中断JAVA线程(An-Beer 工作室)

1、Android Thread interrupt 中断JAVA线程(转)转载自：假如我们有一个任务如下，交给一个Java线程来执行，如何才能保证调用interrupt()来中断它呢？代码 1classATaskimplementsRunnable23privatedoubled=0.0;45publicvoidrun()6/死循环执行打印Iamrunning!和做消耗时间的浮点计算7while(true)8System.out.println(Iamrunning!);910for(inti=0;i900000;i+)11d=d+(Math.PI+Math.E)/d;1213/给线程调度器可以

2、切换到其它进程的信号14Thread.yield();151617代码 1publicclassInterruptTaskTest23publicstaticvoidmain(Stringargs)throwsException4/将任务交给一个线程执行5Threadt=newThread(newATask();6t.start();78/运行一断时间中断线程9Thread.sleep(100);10System.out.println(*);11System.out.println(InterruptedThread!);12System.out.println(*);13erru

3、pt();141516运行这个程序，我们发现调用interrupt()后，程序仍在运行，如果不强制结束，程序将一直运行下去，如下所示: Java代码1. . 2. I am running! 3. I am running! 4. I am running! 5. I am running! 6. * 7. Interrupted Thread! 8. * 9. I am running! 10. I am running! 11. I am running! 12. I am running! 13. I am running! 14. . 虽然中断发生了，但线程仍然在进行，离开线程有两种常

4、用的方法： 抛出InterruptedException和用Terrupted()检查是否发生中断,下面分别看一下这两种方法： 1.在阻塞操作时如Thread.sleep()时被中断会抛出InterruptedException(注意，进行不能中断的IO操作而阻塞和要获得对象的锁调用对象的synchronized方法而阻塞时不会抛出InterruptedException) 代码 1classATaskimplementsRunnable23privatedoubled=0.0;45publicvoidrun()6/死循环执行打印Iamrunning!和做消耗时间的浮点计算7

5、try8while(true)9System.out.println(Iamrunning!);1011for(inti=0;i900000;i+)12d=d+(Math.PI+Math.E)/d;1314/休眠一断时间,中断时会抛出InterruptedException15Thread.sleep(50);1617catch(InterruptedExceptione)18System.out.println(ATask.run()interrupted!);19202122程序运行结果如下: Java代码1. I am running! 2. I am running! 3. * 4.

6、Interrupted Thread! 5. * 6. ATask.run() interrupted! 可以看到中断任务时让任务抛出InterruptedException来离开任务 2.Terrupted()检查是否发生中断.Terrupted()能告诉你线程是否发生中断,并将清除中断状态标记，所以程序不会两次通知你线程发生了中断 代码 1classATaskimplementsRunnable23privatedoubled=0.0;45publicvoidrun()67/检查程序是否发生中断8while(!Terrupted()9S

7、ystem.out.println(Iamrunning!);1011for(inti=0;i900000;i+)12d=d+(Math.PI+Math.E)/d;13141516System.out.println(ATask.run()interrupted!);171819程序运行结果如下： Java代码1. I am running! 2. I am running! 3. I am running! 4. I am running! 5. I am running! 6. I am running! 7. I am running! 8. * 9. Interrupted Threa

8、d! 10. * 11. ATask.run() interrupted! 我们可结合使用两种方法来达到可以通过interrupt()中断线程.请看下面例子: 代码 1classATaskimplementsRunnable23privatedoubled=0.0;45publicvoidrun()67try8/检查程序是否发生中断9while(!Terrupted()10System.out.println(Iamrunning!);11/point1beforesleep12Thread.sleep(20);13/point2aftersleep14System.out.

9、println(Calculating);15for(inti=0;i900000;i+)16d=d+(Math.PI+Math.E)/d;17181920catch(InterruptedExceptione)21System.out.println(ExitingbyException);222324System.out.println(ATask.run()interrupted!);252627在point1之前处point2之后发生中断会产生两种不同的结果，可以通过修改InterruptTaskTest main()里的Thread.sleep()的时间来达到在point1之前产生中

10、断或在point2之后产生中断. 如果在point1之前发生中断，程序会在调用Thread.sleep()时抛出InterruptedException从而结束线程这和在Thread.sleep()时被中断是一样的效果.程序运行结果可能如下： Java代码1. I am running! 2. Calculating 3. I am running! 4. Calculating 5. I am running! 6. Calculating 7. I am running! 8. * 9. Interrupted Thread! 10. * 11. Exiting by Exception 12. ATask.run() interrupted! 如果在point2之后发生中断，线程会继续执行到下一次while判断中断状态时程序运行结果可能如下： J