head first上教材上一个java的小游戏

class GuessGame{
    Player p1;
    Player p2;
    Player p3;//如果用public class GuessGame会报错？

    public void startGame(){
        p1 = new Player();
        p2 = new Player();
        p3 = new Player();

        int guessp1 = 0;
        int guessp2 = 0;
        int guessp3 = 0;

        boolean p1isRight = false;
        boolean p2isRight = false;
        boolean p3isRight = false;

        int targetNumber = (int) (Math.random() * 10);/*调用这个Math.Random()函数能够返回带正号的double值，该值大于等于0.0且小于1.0，即取值范围是[0.0,1.0)的左闭右开区间，返回值是一个伪随机选择的数，在该范围内（近似）均匀分布。*/
        System.out.println("I'm thinking of a number bertween 0 and 9...");

        while(true){
            System.out.println("Number to guess is " + targetNumber);

            p1.guess();
            p2.guess();
            p3.guess();

            guessp1 = p1.number;
            System.out.println("Player one guessed" + guessp1);

            guessp2 = p2.number;
            System.out.println("Player two guessed" + guessp2);

            guessp3 = p3.number;
            System.out.println("Player three guessed" + guessp3);

            if(guessp1 == targetNumber){
                p1isRight = true;
            }
            if(guessp2 == targetNumber){
                p2isRight = true;
            }
            if(guessp3 == targetNumber){
                p3isRight = true;
            }

            if(p1isRight || p2isRight || p3isRight){
                System.out.println("We have a winner!");
                System.out.println("Player one got it right?" + p1isRight);
                System.out.println("Player two got it right?" + p2isRight);
                System.out.println("Player three got it right?" + p3isRight);
                System.out.println("Game is over.");
                break;
            }else{
                System.out.println("Player will have to try again.");
            }
                    }
    }
}

class Player{
    int number = 0;

    public void guess(){
        number = (int) (Math.random() * 10);
        System.out.println("I'm guessing" + number);
    }
}

public class test{
    public static void main(String[] args) {
        GuessGame game = new GuessGame();
        game.startGame();
    }
}

//系统随机生成一个数，程序猜三个数，猜对至少一个退出，否则继续。