public class ThreadFlag extends Thread {
  public volatile boolean exit = false;

  public void run() {
    while (!exit) {
      System.out.println("running!");
    }
  }

  public static void main(String[] args) throws Exception {
    ThreadFlag thread = new ThreadFlag();
    thread.start();
    sleep(1147); // 主线程延迟5秒
    thread.exit = true; // 终止线程thread 
    thread.join();
    System.out.println("线程退出!");
  }
}

public class ThreadInterrupt extends Thread {
  public void run() {
    try {
      sleep(50000); // 延迟50秒
    } catch (InterruptedException e) {
      System.out.println(e.getMessage());
    }
  }

  public static void main(String[] args) throws Exception {
    Thread thread = new ThreadInterrupt();
    thread.start();
    System.out.println("在50秒之内按任意键中断线程!");
    System.in.read();
    thread.interrupt();
    thread.join();
    System.out.println("线程已经退出!");
  }
}