java在sleep时调用interrupt方法

2024年4月16日 互联网

 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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