java多線程模擬龜兔賽跑

讓烏龜和兔子在同一個賽道從1開始跑到100,看看誰更快.

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

    @Override
    public void run() {
        //賽道
        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("勝利者是-->"+winner);
            }
        }
        return false;
    }

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

    }

}

運行結果:

兔子---->走了1步

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

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

怎么竟然是兔子贏了,可是現實中龜兔賽跑是烏龜贏了,我們加入線程睡眠要是兔子就讓他睡一會,烏龜就可以贏了.

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

    @Override
    public void run() {
        //賽道
        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("勝利者是-->"+winner);
            }
        }
        return false;
    }

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

    }

}

運行結果:

烏龜---->走了96步
烏龜---->走了97步
烏龜---->走了98步
烏龜---->走了99步
烏龜---->走了100步
勝利者是-->烏龜
兔子---->走了50步

這下不管怎么跑都是烏龜贏了.