java学习笔记15--多线程编程基础2

class Balls {
    boolean flag0 = false;    //0号球的标志变量，true表示已被人拿，false表示未被任何人拿
    boolean flag1 = false;    //1号球的标志变量
    boolean flag2 = false;    //2号球的标志变量
}
class Player0 extends Thread {    //0号游戏者的类
    private Balls ball;
    public Player0(Balls b) {
        this.ball = b;
    }
    public void run() {
        while(true) {
            while(ball.flag1 == true){}    //如果1号球已被拿走，则等待
            ball.flag1 = true;    //拿起1号球
            while(ball.flag0 == true){}    //如果0号球已被拿走，则等待
            if(ball.flag1 == true && ball.flag0 == false) {
                ball.flag0 = true;    //拿起0号球
                System.out.println("Player0 has got two balls!");
                ball.flag1 = false;    //放下1号球
                ball.flag0 = false;    //放下0号球
                try {
                    sleep(1);        //放下后休息1ms
                } catch (Exception e) {
                    
                }
            }
        }
    }
}
class Player1 extends Thread {    //1号游戏者的类
    private Balls ball;
    public Player1(Balls b) {
        this.ball = b;
    }
    public void run() {
        while(true) {
            while(ball.flag0 == true){}
            ball.flag0 = true;
            while(ball.flag1 == true){}
            if(ball.flag0 == true && ball.flag1 == false) {
                ball.flag1 = true;
                System.out.println("Player0 has got two balls!");
                ball.flag0 = false;
                ball.flag1 = false;
                try {
                    sleep(1);
                } catch (Exception e) {
                    
                }
            }
        }
    }
}
class Player2 extends Thread {    //2号游戏者的类
    private Balls ball;
    public Player2(Balls b) {
        this.ball = b;
    }
    public void run() {
        while(true) {
            while(ball.flag2 == true){}
            ball.flag2 = true;
            while(ball.flag1 == true){}
            if(ball.flag2 == true && ball.flag1 == false) {
                ball.flag1 = true;
                System.out.println("Player0 has got two balls!");
                ball.flag2 = false;
                ball.flag1 = false;
                try {
                    sleep(1);
                } catch (Exception e) {
                    
                }
            }
        }
    }
}
public class playball {
    public static void main(String[] args) {
        Balls ball = new Balls();    //创建一个球类对象
        Player0 p0 = new Player0(ball);    //创建0号游戏者
        Player1 p1 = new Player1(ball);    //创建1号游戏者
        Player2 p2 = new Player2(ball);    //创建2号游戏者
        p0.start();    //启动0号游戏者
        p1.start();    //启动1号游戏者
        p2.start();    //启动2号游戏者
    }
}