java多线程模拟龟兔赛跑

让乌龟和兔子在同一个赛道从1开始跑到100,看看谁更快.

public class Racer implements Runnable{
    private static String winner;//胜利者

    @Override
    public void run() {
        //赛道
        for (int step = 1; step <= 100; step++) {
 /* if(Thread.currentThread().getName().equals("兔子")&&step%50==0){
      try {
          Thread.sleep(200);
      } catch (InterruptedException e) {
          e.printStackTrace();
      }
  }*/
            System.out.println(Thread.currentThread().getName()+"---->走了"+step+"步");

             boolean flag= GameOver(step);
             if(flag){
                 break;
             }

        }
    }

    private boolean GameOver(int step) {
        if(winner!=null){
            return true;
        }else{
            if(step==100){
                winner=Thread.currentThread().getName();
                System.out.println("胜利者是-->"+winner);
            }
        }
        return false;
    }

    public static void main(String[] args) {
        Racer racer = new Racer();
        new Thread(racer,"兔子").start();
        new Thread(racer,"乌龟").start();

    }

}

运行结果:

兔子---->走了1步

...................

兔子---->走了98步
兔子---->走了99步
兔子---->走了100步
胜利者是-->兔子

怎么竟然是兔子赢了,可是现实中龟兔赛跑是乌龟赢了,我们加入线程睡眠要是兔子就让他睡一会,乌龟就可以赢了.

public class Racer implements Runnable{
    private static String winner;//胜利者

    @Override
    public void run() {
        //赛道
        for (int step = 1; step <= 100; step++) {
  if(Thread.currentThread().getName().equals("兔子")&&step%50==0){
      try {
          Thread.sleep(200);
      } catch (InterruptedException e) {
          e.printStackTrace();
      }
  }
            System.out.println(Thread.currentThread().getName()+"---->走了"+step+"步");

             boolean flag= GameOver(step);
             if(flag){
                 break;
             }

        }
    }

    private boolean GameOver(int step) {
        if(winner!=null){
            return true;
        }else{
            if(step==100){
                winner=Thread.currentThread().getName();
                System.out.println("胜利者是-->"+winner);
            }
        }
        return false;
    }

    public static void main(String[] args) {
        Racer racer = new Racer();
        new Thread(racer,"兔子").start();
        new Thread(racer,"乌龟").start();

    }

}

运行结果:

乌龟---->走了96步
乌龟---->走了97步
乌龟---->走了98步
乌龟---->走了99步
乌龟---->走了100步
胜利者是-->乌龟
兔子---->走了50步

这下不管怎么跑都是乌龟赢了.