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.

 1 public class Racer implements Runnable{
 2     private static String winner;//胜利者
 3
 4     @Override
 5     public void run() {
 6         //赛道
 7         for (int step = 1; step <= 100; step++) {
 8  /* if(Thread.currentThread().getName().equals("兔子")&&step%50==0){
 9       try {
10           Thread.sleep(200);
11       } catch (InterruptedException e) {
12           e.printStackTrace();
13       }
14   }*/
15             System.out.println(Thread.currentThread().getName()+"---->走了"+step+"步");
16
17              boolean flag= GameOver(step);
18              if(flag){
19                  break;
20              }
21
22         }
23     }
24
25     private boolean GameOver(int step) {
26         if(winner!=null){
27             return true;
28         }else{
29             if(step==100){
30                 winner=Thread.currentThread().getName();
31                 System.out.println("胜利者是-->"+winner);
32             }
33         }
34         return false;
35     }
36
37     public static void main(String[] args) {
38         Racer racer = new Racer();
39         new Thread(racer,"兔子").start();
40         new Thread(racer,"乌龟").start();
41
42     }
43
44 }

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.

 1 public class Racer implements Runnable{
 2     private static String winner;//胜利者
 3
 4     @Override
 5     public void run() {
 6         //赛道
 7         for (int step = 1; step <= 100; step++) {
 8   if(Thread.currentThread().getName().equals("兔子")&&step%50==0){
 9       try {
10           Thread.sleep(200);
11       } catch (InterruptedException e) {
12           e.printStackTrace();
13       }
14   }
15             System.out.println(Thread.currentThread().getName()+"---->走了"+step+"步");
16
17              boolean flag= GameOver(step);
18              if(flag){
19                  break;
20              }
21
22         }
23     }
24
25     private boolean GameOver(int step) {
26         if(winner!=null){
27             return true;
28         }else{
29             if(step==100){
30                 winner=Thread.currentThread().getName();
31                 System.out.println("胜利者是-->"+winner);
32             }
33         }
34         return false;
35     }
36
37     public static void main(String[] args) {
38         Racer racer = new Racer();
39         new Thread(racer,"兔子").start();
40         new Thread(racer,"乌龟").start();
41
42     }
43
44 }

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.

原文地址：https://www.cnblogs.com/xiaoqiqistudy/p/10984279.html