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1、使用中断标志位

public class StopThreadTest extends Thread {private boolean exit = false;@Overridepublic void run() {while (!exit) {try {System.out.println("i am running,please wait a moment");Thread.sleep(500);} catch (InterruptedException e) {e.printStackTrace();}}}public static void main(String[] args) {try {StopThreadTest threadTest = new StopThreadTest();threadTest.start();Thread.sleep(4000);threadTest.exit = true;} catch (InterruptedException e) {e.printStackTrace();}}
}

2、 使用 interrupt() 中断线程

严格的说，线程中断并不会使线程立即退出，而是给线程发送一个通知，告知目标线程，有人希望你退出了！至于目标线程接收到通知之后如何处理，则完全由目标线程自己决定

线程阻塞状态中如何中断？

public class StopThreadTest{public static void main(String[] args) throws InterruptedException {Thread thread = new Thread() {@Overridepublic void run() {while (true){System.out.println("i am running");try {TimeUnit.SECONDS.sleep(100);} catch (InterruptedException e) {
//                        this.interrupt();e.printStackTrace();}if (Thread.currentThread().isInterrupted()){System.out.println("i am exit");break;}}}};thread.start();TimeUnit.SECONDS.sleep(1);thread.interrupt();}
}

运行上面的代码，发现程序无法终止

sleep方法由于中断而抛出异常之后，线程的中断标志会被清除（置为false），所以在异常中需要执行this.interrupt()方法，将中断标志位置为true

public class StopThreadTest{public static void main(String[] args) throws InterruptedException {Thread thread = new Thread() {@Overridepublic void run() {while (true){System.out.println("i am running");try {TimeUnit.SECONDS.sleep(100);} catch (InterruptedException e) {this.interrupt();e.printStackTrace();}if (Thread.currentThread().isInterrupted()){System.out.println("i am exit");break;}}}};thread.start();TimeUnit.SECONDS.sleep(1);thread.interrupt();}
}

1. 调用线程的interrupt()实例方法，线程的中断标志会被置为true

2. 当线程处于阻塞状态时，调用线程的interrupt()实例方法，线程内部会触发InterruptedException异常，并且会清除线程内部的中断标志（即将中断标志置为false）

   public class StopThreadTest {/*** 通过interrupt()方式进行中断,同时运用了volatile，保证了flag变量在主线程与T1线程可见性*/public volatile static boolean flag = true;public static class T1 extends Thread {public T1(String name) {super(name);}@Overridepublic void run() {System.out.println("线程 " + this.getName() + " in");while (flag) {}System.out.println("线程 " + this.getName() + " stop");}}public static void main(String[] args) throws InterruptedException {T1 cp = new T1("cp");cp.start();TimeUnit.SECONDS.sleep(1);flag = false;}
   }