4、龟兔赛跑案例

public class RaceTest implements Runnable {
    // 创建一个胜利者
    private static String winner;

    @Override
    public void run() {
        for (int i = 1; i <= 100; i++) {
            // 判断是否出现胜利者
            boolean flag = this.isWinner(i);
            if (flag) {
                break;
            }
            // 当兔子跑的时候，需要睡觉
            if("兔子".equals(Thread.currentThread().getName())&&i%10==22){
                try {
                    Thread.sleep(2);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            
            System.out.println(Thread.currentThread().getName() + "跑了" + i + "步");
        }
    }

    private boolean isWinner(int step) {
        // 判断是否存在胜利者
        if (winner != null) {
            return true;
        }
        // 当步数达到时，宣布胜利者
        if (step >= 100) {
            winner = Thread.currentThread().getName();
            System.out.println(winner + "赢了");
            return true;
        }
        return false;
    }

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

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