在java中编写21点和纸牌程序时遇到问题

我已经在这个项目上工作了几天，我不明白为什么它不起作用。希望一双新的眼睛会有所帮助。当我运行这个程序时，有几件事没有发生

唯一真正起作用的是管理用户下注的部分。一些问题包括：

• 它不会带来卡值（应该来自随机生成1-13之间的数字的类）

• 不等待用户输入0以绘制更多卡片

• 当它说第三张卡是什么时，它说的是

  Card@42a57993

• 不提供卡的总价值
• 当我试图修复一个问题时，也会发生一个错误。除了cardTotal之外，错误表示“参数类型的运算符+未定义。”

它可能丢失或有额外的括号，但我找不到它们应该/不应该在哪里。这是我的密码：

import java.util.Scanner; 

public class Game {
   private double pot;
   private double bet; 
   private int answer; 
   private int cardTotal; 

   Card card1 = new Card();
   Card card2 = new Card();
   Card card3 = new Card(); 

   // constructor
   public Game(){
      pot = 100;
      bet = 0; 
   }

   Scanner keyboard = new Scanner(System.in);

   // GetBetFrom user, prompts user to enter a valid bet, reenter until a valid amount
   public double getBetFromUser(){
      System.out.println("Your current pot is: "+pot);

      System.out.println("Enter your bet amount");
      bet = keyboard.nextDouble();  

      //Rules for the bet
      while(bet>pot || bet<0){
         if(pot==0){
            break; 
         }
         if(bet>pot){
            System.out.println("Sorry, you don't have enough money for that, try again");
            bet = keyboard.nextDouble(); 
         }
         if(bet<0){
            System.out.println("That is not a valid bet, please try again");
            bet = keyboard.nextDouble(); 
         }
     }
     return bet;
  }

  // Game mechanics 
  public void gamePlay(){
     System.out.println("Your first card is: "+card1);
     System.out.println("Your second card is: "+card2);
     cardTotal= card1 + card2; 
     System.out.println("Your total is: "+cardTotal);
     System.out.println("Enter 0 to draw more, any other number to quit: ");

     if(answer == 0); {
        System.out.println("Your next card is: "+card3);
        System.out.println("Your total is: "); 
     }
 }

 public void results(){
    if(cardTotal > 21){
       System.out.println("You lose your bet");
       pot = pot-bet; 
    }
    if(cardTotal==21){
       System.out.println("You win three times your bet");
       pot = pot-bet+(bet*3);
    }
    if(cardTotal==20){
       System.out.println("You win double your bet amount");
       pot = pot-bet+(bet*2); 
    }
    if(cardTotal<=19){
       System.out.println("You win your bet amount");
    }
 }
}

---

}我猜您的错误发生在这里：

cardTotal= card1 + card2; 

---

card1

和

card2

是

Card

类型。编译器不知道如何添加它们

您应该这样获得您的卡总金额：

cardTotal = card1.cardValue+ card2.cardValue;

---

这可能对你有帮助。我建议您阅读如何引用对象及其方法。键盘输入数据的验证丢失，但这是您的工作：

import java.util.Scanner;
public class Game {
   private double pot;
   private double bet; 
   private int answer; 
   private int cardTotal;

   Card card1 = new Card();
   Card card2 = new Card();
   Card card3 = new Card(); 

   // constructor
   public Game(){
      pot = 100;
      bet = 0; 
   }

   Scanner keyboard = new Scanner(System.in);

   // GetBetFrom user, prompts user to enter a valid bet, reenter until a valid amount
   public double getBetFromUser(){
      System.out.println("Your current pot is: "+pot);

      System.out.print("Enter your bet amount: ");
      bet = keyboard.nextDouble();  

      //Rules for the bet
      while(bet>pot || bet<0){
         if(pot==0){
            break; 
         }
         if(bet>pot){
            System.out.println("Sorry, you don't have enough money for that, try again");
            bet = keyboard.nextDouble(); 
         }
         if(bet<0){
            System.out.println("That is not a valid bet, please try again");
            bet = keyboard.nextDouble(); 
         }
     }
     return bet;
  }

  // Game mechanics 
  public void gamePlay(){
     int first= card1.getCard();
     int second = card2.getCard();
     int third = card3.getCard();
     System.out.println("Your first card is: "+first);
     System.out.println("Your second card is: "+second);
     cardTotal= first + second;
     System.out.println("Your total is: "+cardTotal);
     System.out.print("Enter 0 to draw more, any other number to quit: ");
     answer = keyboard.nextInt(); 

     if(answer == 0) {
        System.out.println("Your next card is: "+third);
        cardTotal=cardTotal + third;
     }
     System.out.println("Your total is: "+cardTotal); 
 }

 public void results(){
    if(cardTotal > 21){
       System.out.println("You lose your bet");
       pot = pot-bet; 
    }
    if(cardTotal==21){
       System.out.println("You win three times your bet");
       pot = pot-bet+(bet*3);
    }
    if(cardTotal==20){
       System.out.println("You win double your bet amount");
       pot = pot-bet+(bet*2); 
    }
    if(cardTotal<=19){
       System.out.println("You win your bet amount");
    }
 }

 public static void main(String[] args) {
      Game game = new Game();
      game.getBetFromUser();
      game.gamePlay();
      game.results();
 }     

import java.util.Scanner；
公开课游戏{
私人双罐；
私人双注；
私人回答；
私人总收入；
Card card1=新卡（）；
Card card2=新卡（）；
Card card3=新卡（）；
//建造师
公共游戏（）{
pot=100；
bet=0；
}
扫描仪键盘=新扫描仪（System.in）；
//GetBetFrom user，提示用户输入有效下注，重新输入，直到达到有效金额
公共双getBetFromUser（）函数{
System.out.println（“您当前的pot是：“+pot”）；
System.out.print（“输入您的下注金额：”）；
bet=键盘.nextDouble（）；
//下注规则
而（赌注>赌注| |赌注）{
System.out.println（“对不起，您没有足够的钱，再试一次”）；
bet=键盘.nextDouble（）；
}
如果（赌21）{
System.out.println（“你输了赌注”）；
赌注=赌注；
}
如果（cardTotal==21）{
System.out.println（“你赢了三倍的赌注”）；
赌注=赌注+（赌注*3）；
}
如果（cardTotal==20）{
System.out.println（“你赢了双倍的赌注”）；
赌注=赌注+（赌注*2）；
}
如果（CardTotal如果你每个问题问1个问题，你会得到更好的回答。你在这个问题中列出了5个问题。你应该关注其中一个问题。你还应该尝试一次一个地实现你的要求。在你知道随机生成额外卡的代码起作用之前，不要开始编写抽卡代码。这样，你就有了更简单的问题要解决，而不是一次解决所有的问题Card@42a57993

，compare@sockowl这取决于

卡类的定义。您需要移动
新随机（）
进入一个静态初始值设定项，因此它只在程序开始时发生一次，您需要将调用从
getCard（）
移动到
Card（）
初始值设定项中，以使新卡的随机值不会在每次调用
getCard（）时改变
。摆脱那个愚蠢的
开关
；你还没有学会数组吗？@sockowl这里有一些变化。
import java.util.Scanner;
public class Game {
   private double pot;
   private double bet; 
   private int answer; 
   private int cardTotal;

   Card card1 = new Card();
   Card card2 = new Card();
   Card card3 = new Card(); 

   // constructor
   public Game(){
      pot = 100;
      bet = 0; 
   }

   Scanner keyboard = new Scanner(System.in);

   // GetBetFrom user, prompts user to enter a valid bet, reenter until a valid amount
   public double getBetFromUser(){
      System.out.println("Your current pot is: "+pot);

      System.out.print("Enter your bet amount: ");
      bet = keyboard.nextDouble();  

      //Rules for the bet
      while(bet>pot || bet<0){
         if(pot==0){
            break; 
         }
         if(bet>pot){
            System.out.println("Sorry, you don't have enough money for that, try again");
            bet = keyboard.nextDouble(); 
         }
         if(bet<0){
            System.out.println("That is not a valid bet, please try again");
            bet = keyboard.nextDouble(); 
         }
     }
     return bet;
  }

  // Game mechanics 
  public void gamePlay(){
     int first= card1.getCard();
     int second = card2.getCard();
     int third = card3.getCard();
     System.out.println("Your first card is: "+first);
     System.out.println("Your second card is: "+second);
     cardTotal= first + second;
     System.out.println("Your total is: "+cardTotal);
     System.out.print("Enter 0 to draw more, any other number to quit: ");
     answer = keyboard.nextInt(); 

     if(answer == 0) {
        System.out.println("Your next card is: "+third);
        cardTotal=cardTotal + third;
     }
     System.out.println("Your total is: "+cardTotal); 
 }

 public void results(){
    if(cardTotal > 21){
       System.out.println("You lose your bet");
       pot = pot-bet; 
    }
    if(cardTotal==21){
       System.out.println("You win three times your bet");
       pot = pot-bet+(bet*3);
    }
    if(cardTotal==20){
       System.out.println("You win double your bet amount");
       pot = pot-bet+(bet*2); 
    }
    if(cardTotal<=19){
       System.out.println("You win your bet amount");
    }
 }

 public static void main(String[] args) {
      Game game = new Game();
      game.getBetFromUser();
      game.gamePlay();
      game.results();
 }