Java多线程 模拟龟兔赛跑

public class Race implements Runnable{

    private static String winner;
    @Override
    public void run() {
        for (int i = 1; i <= 100; i++) {
            //模拟兔子睡觉
            if(Thread.currentThread().getName().equals("兔子")){
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

            boolean flag = getWinner(i);
            //有胜利者，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
    private boolean getWinner(int step){
        if(winner != null) {//已经存在胜利者
            return true;
        }else if(step == 100){
            winner = Thread.currentThread().getName();
            System.out.println("Winner is" + winner);
            return true;
        }else {
            return false;
        }
    }

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