龟兔赛跑（Runnable接口实现）

//模拟归途赛跑
public class Race implements Runnable {
          
   

    //胜利者
    private static String winner;

    @Override
    public void run() {
          
   
        for (int i = 0; i <= 100; i++) {
          
   

            //模拟兔子休息
            if ("兔子".equals(Thread.currentThread().getName()) && i==50){
          
   
                try {
          
   
                    Thread.sleep(100);
                } catch (InterruptedException e) {
          
   
                    e.printStackTrace();
                }
            }

            //判断比赛是否结束
            boolean flag = gameover(i);
            //比赛结束
            if (flag){
          
   
                break;
            }

            System.out.println(Thread.currentThread().getName()+"跑了"+i+"步");
        }
    }

    //判断是否完成比赛
    public boolean gameover(int step){
          
   
        //判断是否由胜利者
        if (winner!=null){
          
   
            return true;
        }else{
          
   
            if (step == 100){
          
   
                winner = Thread.currentThread().getName();
                System.out.println("Winner is "+winner);
                return true;
            }
        }
        return false;
    }

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

    }
}