多线程实战-龟兔赛跑

多线程实战，

这个图解释的很形象，开启多线程之后，子线程与主线程并行运行。

package com.xin.myThread01;

public class Race implements Runnable{

    //胜利者，winner一定要用全局变量，如果用局部变量，就会出现两个胜利者，因为两个线程，互不干扰
    private static String winner;

    @Override
    public void run() {
        for (int i = 0; i <=100; i++) {
            if(Thread.currentThread().getName().equals("兔子")&&i%10==0){
                try {
                    Thread.sleep(10);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

            }
            boolean flag = gameOver(i);
            if (flag){
                break;
            }
            System.out.println(Thread.currentThread().getName()+"--->跑了"+i+"步");
        }
    }

//    判断是否结束比赛
    private boolean gameOver(int steps){

        if(winner!=null){
            return true;
        }else {
            if(steps>=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();
    }
}

思路来源：B站狂神说多线程