多线程模拟龟兔赛跑

package DemoThread;
    //模拟龟兔赛跑
public class TestThread03 implements Runnable{
    //胜利者
    private static String winner;

    @Override
    public void run() {
        for (int i = 0; i <= 100; i++) {
            boolean flag=gameOver(i);
            if (flag)
            {
               break;
            }
            System.out.println(Thread.currentThread().getName()+"-->跑了"+i+"步");
        }

    }
    //判断是否完成比赛
        private boolean gameOver(int steps){
        if (winner!=null){
            return true;
        }{ if(steps>=100){
                   winner= Thread.currentThread().getName();
                    System.out.println("winner is"+winner);
                }
            }
           return false;
        }

        public static void main(String[] args) {
            TestThread03 testThread03=new TestThread03();
            new Thread(testThread03,"兔子").start();
            new Thread(testThread03,"乌龟").start();

        }
}