二、java多线程编程核心技术之（笔记）——如何停止线程?

1、异常法

public class MyThread extends Thread {
    @Override
      public void run() {
        super.run();
        try {
            for (int i = 0; i < 5000000; i++) {
                if(this.interrupted()){
                    System.out.println("我要停止了。。。。。");
                    throw new InterruptedException();      \\抛出异常
                }
                System.out.println("i="+(i+1));
            }
            System.out.println("我在for下边。。");
        } catch (InterruptedException e) {
            System.out.println(" in MyThread catch..");
            e.printStackTrace();
        }
    }    public static void main(String[] args) {
        try {
            MyThread myThread=new MyThread();
            myThread.start();
            Thread.sleep(2000);
            myThread.interrupt();
        } catch (InterruptedException e) {
            System.out.println("main catch");
            e.printStackTrace();
        }
        System.out.println("end");
    }
}

结果：

2，在沉睡中停止，即在sleep()状态下停止。

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 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!");
    }
}

结果：

3、暴力停止 stop()(已作废方法，不推荐使用)

注意：

（1）、暴力停止，可能导致清理工作完成不了。

（2）、导致数据的不到同步处理，导致数据不一致问题。

public class MyThread extends Thread {
    private int i = 0;    @Override
    public void run() {
        try {
            while (true) {
                i++;
                System.out.println("i=" + i);
                Thread.sleep(1000);
            }
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        try {
            MyThread thread = new MyThread();
            thread.start();
            Thread.sleep(8000);
            thread.stop();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }}

4、使用ruturn停止线程

public class MyThread extends Thread {    @Override
    public void run() {
            while (true) {
                if (this.isInterrupted()) {
                    System.out.println("停止了!");
                    return;
                }
                System.out.println("timer=" + System.currentTimeMillis());
            }
    }
    public static void main(String[] args) throws InterruptedException {
        MyThread t=new MyThread();
        t.start();
        Thread.sleep(2000);
        t.interrupt();
    }
}

结果：