java初学者有没有前方人帮下忙

package com.test.daily;
public class GuessGame{
Player p1;
Player p2;
Player p3;
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);
System.out.println("I'M thinking of number between 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;//游戏结束
} else {
//都没猜到，所以要继续下去
System.out.println("Players will have to try again.");
}// if/else结束
｝//循环结束
}//方法结束
}//类结束
class Player{
public int number;
void guess(){
this.number = (int)(Math.random() * 10);
}
}

player 类你都没定义这要怎么运行