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 sleep() & interrupt()

线程A正在使用sleep()暂停着: Thread.sleep(100000);

如果要取消他的等待状态,可以在正在执行的线程里(比如这里是B)调用

    a.interrupt();

令线程A放弃睡眠操作,这里a是线程A对应到的Thread实例

执行interrupt()时,并不需要获取Thread实例的锁定.任何线程在任何时刻,都可以调用其他线程interrupt().当sleep中的线程被调用interrupt()时,就会放弃暂停的状态.并抛出InterruptedException.丢出异常的,是A线程.

情况1：先睡眠后打断，则直接打断睡眠，并且清除停止状态值，使之变成false：

public class MyThread extends Thread{    @Override    public void run() {        super.run();        try{            System.out.println("run begin");            Thread.sleep(200000);            System.out.println("run end");        }catch (InterruptedException e){            System.out.println("在沉睡中被停止！进入catch！"+this.isInterrupted());            e.printStackTrace();        }    }}

public class Run {    public static void main(String[] args){        try{            MyThread thread=new MyThread();            thread.start();            Thread.sleep(200);            thread.interrupt();        }catch (InterruptedException e){            System.out.println("main catch");            e.printStackTrace();        }        System.out.println("end!");    }}

run begin java.lang.InterruptedException: sleep interrupted at java.lang.Thread.sleep(Native Method) at com.mr.three.MyThread.run(MyThread.java:12) end! 在沉睡中被停止！进入catch！false

情况2：先打断后睡眠，则直接不睡眠：

public class MyThread extends Thread{    @Override    public void run() {        super.run();        try{            System.out.println("run begin");            for(int i=0;i<500000;i++){                System.out.println(i);            }            Thread.sleep(200000);            System.out.println("run end");        }catch (InterruptedException e){            System.out.println("在沉睡中被停止！进入catch！"+this.isInterrupted());            e.printStackTrace();        }    }}

public class Run {    public static void main(String[] args){        try{            MyThread thread=new MyThread();            thread.start();            Thread.sleep(1);            thread.interrupt();        }catch (InterruptedException e){            System.out.println("main catch");            e.printStackTrace();        }        System.out.println("end!");    }}

499997 499998 499999 在沉睡中被停止！进入catch！false java.lang.InterruptedException: sleep interrupted at java.lang.Thread.sleep(Native Method) at com.mr.three.MyThread.run(MyThread.java:15)

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