多线程 -- interrupt()方法

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interrupt()方法不会中断一个正在运行的线程，它用于提前退出线程的阻塞状态，也就是说当线程通过Object.wait() / Thread.sleep() / Thread.join() / 方法进入阻塞状态后，如果调用线程中断方法，该线程会收到一个InterruptedException中断异常，可以在catch中编写自己需要的代码。

public class InterruptThread {public static void main(String[] args){Thread t1 = new Thread(new Runnable(){@Overridepublic void run() {// TODO Auto-generated method stubtry{long time = System.currentTimeMillis();while(System.currentTimeMillis()- time <1000){}System.out.println("T1_normal");}catch(Exception e){System.out.println("T1_Exception e="+e);}}},"t1");t1.start();t1.interrupt();Thread t2 = new Thread(new Runnable(){@Overridepublic void run() {// TODO Auto-generated method stubtry {Thread.sleep(1000);System.out.println("T2_sleep_normal");} catch (InterruptedException e) {// TODO Auto-generated catch blockSystem.out.println("T2_sleep_Exception e="+e);}}},"t2");t2.start();t2.interrupt();Thread t4 = new Thread(new Runnable(){@Overridepublic void run() {// TODO Auto-generated method stubtry {this.wait(1000);System.out.println("T4_wait_normal");} catch (Exception e) {// TODO Auto-generated catch blockSystem.out.println("T4_wait_Exception e="+e);}}},"t4");t4.start();t4.interrupt();Thread t5 = new Thread(new Runnable(){@Overridepublic synchronized void run() {// TODO Auto-generated method stubtry {this.wait(1000);System.out.println("T5_wait_normal");} catch (InterruptedException e) {// TODO Auto-generated catch blockSystem.out.println("T5_wait_Exception e="+e);}}},"t5");t5.start();t5.interrupt();try{t5.start();System.out.println("T5_again_wait_normal");}catch(Exception e){System.out.println("T5_again_wait_Exception e="+e);}}}

打印出来的log（顺序随机）：

T2_sleep_Exception e=java.lang.InterruptedException: sleep interrupted
T4_wait_Exception e=java.lang.IllegalMonitorStateException
T5_again_wait_Exception e=java.lang.IllegalThreadStateException
T5_wait_Exception e=java.lang.InterruptedException
T1_normal

1.线程T1:

log：T1_normal

可以看出interrupt()方法不会中断正在执行的线程。

2.线程T2:

log：T2_sleep_Exception e=java.lang.InterruptedException: sleep interrupted

可以看出sleep中断

3.线程T4:

log:T4_wait_Exception e=java.lang.IllegalMonitorStateException

这个是在没有被锁定的对象中，调用wait()方法产生的异常

4.线程T5:

log:T5_wait_Exception e=java.lang.InterruptedException

wait中断

log:

T5_again_wait_Exception e=java.lang.IllegalThreadStateException

重复调用线程的start()方法产生的异常

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