关于多进程问题

Question

启动 sj1  nm1 两个进程后，什么时候会修改keep值为false，是随机的吗

public class JunDui implements Runnable{
 //volatile保证了线程可以正确的访问其他线程写入的值
  volatile boolean keep = true;
 @Override
 public void run() {

  // TODO Auto-generated method stub
  while (keep ) {
   for (int i = 0; i < 5; i++) {
    System.out.println(Thread.currentThread().getName()
      +"发动了"+(i+1)+"次攻击");
    //让出了处理器时间
    Thread.yield();
   }
   System.out.println(Thread.currentThread().getName()
     +"结束了攻击");
  }
 }

}

public class Stage extends Thread {
//舞台
 @Override
 public void run() {
  // TODO Auto-generated method stub
  JunDui sj = new JunDui();
  JunDui nm = new JunDui();
  
  Thread sj1 = new Thread(sj,"隋军");
  Thread nm1 = new Thread(nm,"农民起义军");
  
  //启动进程
  sj1.start();
  nm1.start();
  
  //舞台进程休眠
  try {
   Thread.sleep(50);
  } catch (InterruptedException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  
  sj.keep = false;
  nm.keep = false;
  
  try {
   sj1.join();
  } catch (InterruptedException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }

Answer 1

keep是用来结束线程的标志量，你可以在你需要结束线程的时候讲keep显式置为false