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.