public class MyRunnable implements Runnable { 

 //定义退出标志，true会一直执行，false会退出循环 
 //使用volatile目的是保证可见性，一处修改了标志，处处都要去主存读取新的值，而不是使用缓存 
 public volatile boolean flag = true; 

 public void run() { 
  System.out.println("第" + Thread.currentThread().getName() + "个线程创建"); 

  try { 
   Thread.sleep(1000L); 
  } catch (InterruptedException e) { 
   e.printStackTrace(); 
  } 

  //退出标志生效位置 
  while (flag) { 
  } 
  System.out.println("第" + Thread.currentThread().getName() + "个线程终止"); 
 } 
}

public class TreadTest { 
 public static void main(String[] arg) throws InterruptedException { 
  MyRunnable runnable = new MyRunnable(); 

  //创建3个线程 
  for (int i = 1; i <= 3; i++) { 
   Thread thread = new Thread(runnable, i + ""); 
   thread.start(); 
  } 
  //线程休眠 
  Thread.sleep(2000L); 
  System.out.println("——————————————————————————"); 
  //修改退出标志，使线程终止 
  runnable.flag = false; 
 } 
}

第1个线程创建
第2个线程创建
第3个线程创建
--------------------------
第3个线程终止
第1个线程终止
第2个线程终止

public class MyThread extends Thread {
 public void run(){
  super.run();
  try {
   for(int i=0; i<500000; i++){
    if(this.interrupted()) {
     System.out.println("线程已经终止， for循环不再执行");
      throw new InterruptedException();
    }
    System.out.println("i="+(i+1));
   }

   System.out.println("这是for循环外面的语句，也会被执行");
  } catch (InterruptedException e) {
   System.out.println("进入MyThread.java类中的catch了。。。");
   e.printStackTrace();
  }
 }
}

public class Run {
 public static void main(String args[]){
  Thread thread = new MyThread();
  thread.start();
  try {
   Thread.sleep(2000);
   thread.interrupt();
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
 }
}

...
i=203798
i=203799
i=203800
线程已经终止， for循环不再执行
进入MyThread.java类中的catch了。。。
java.lang.InterruptedException
 at thread.MyThread.run(MyThread.java:13)

public class MyThread extends Thread {
 public void run(){
  super.run();

  try {
   System.out.println("线程开始。。。");
   Thread.sleep(200000);
   System.out.println("线程结束。");
  } catch (InterruptedException e) {
   System.out.println("在沉睡中被停止, 进入catch， 调用isInterrupted()方法的结果是：" + this.isInterrupted());
   e.printStackTrace();
  }

 }
}

线程开始。。。
在沉睡中被停止, 进入catch， 调用isInterrupted()方法的结果是：false
java.lang.InterruptedException: sleep interrupted
 at java.lang.Thread.sleep(Native Method)
 at thread.MyThread.run(MyThread.java:12)

public class MyThread extends Thread {
 public void run(){
  super.run();
  try {
   System.out.println("线程开始。。。");
   for(int i=0; i<10000; i++){
    System.out.println("i=" + i);
   }
   Thread.sleep(200000);
   System.out.println("线程结束。");
  } catch (InterruptedException e) {
    System.out.println("先停止，再遇到sleep，进入catch异常");
   e.printStackTrace();
  }

 }
}

public class Run {
 public static void main(String args[]){
  Thread thread = new MyThread();
  thread.start();
  thread.interrupt();
 }
}

i=9998
i=9999
先停止，再遇到sleep，进入catch异常
java.lang.InterruptedException: sleep interrupted
 at java.lang.Thread.sleep(Native Method)
 at thread.MyThread.run(MyThread.java:15)