java在sleep时调用interrupt方法

逃离我推掉我的手 2022-06-13 05:13 192阅读 0赞

** 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)