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.
