程序不断打印“继续播放”，而不是读取代码

Question

每次运行程序时，如果未达到积分限制，则要求用户继续播放，如果他们选择是，则应返回循环并再次运行代码，但是没有这样做。当我输入“是”时，它只会打印出我当前拥有的点数，而不是返回到循环。

import java.util.*;
public class Blackjack {

    private int points;
    private int limit;
    private Scanner scan;

    public Blackjack() {
        scan = new Scanner(System.in);


    }

    /*Purpose: To print the current points and the limit.
      Input: Points and Limit
      Output: Points and Limit
    */
    public void displayPoints() {
        System.out.println("Your points:" + points + "/" + limit);
    }

    /*Purpose: To ask the user for the game limit.
          Input: Game limit
          Output: Entered limit
        */
    public void startGame() {
        System.out.println("Enter point limit:");
        limit = scan.nextInt();
        displayPoints();
    }

    /*Purpose: To get the roll value from rolling a dice
      Input: Nothing
      Output: Random dice number
    */
    public int getRoll() {
        Random r = new Random();
        int roll = r.nextInt(6) + 1;
        System.out.println("You rolled:" + roll);
        return roll;
    }

    /*Purpose: To see if the player wants to keep playing the game,
      Input: yes or no
      Output: User's response.
    */
    public boolean askUser(boolean firstTime) {

        if (firstTime == true)
            System.out.println("Start Playing?");

        else {
            System.out.println("Keep playing?");

        }
        scan.next();
        return firstTime;
    }

    /* Purpose: to display the result of points in the game.
        Input: No input.
        Output: amount of points in the game.
    */
    public void displayResult() {
        if (points == limit)
            System.out.println("BlackJack!");
        else if (points > limit)
            System.out.println("Bust!");
        else if (points < limit)
            System.out.println("Stand at " + points + " points!");
    }

    /*Purpose: to play all methods
    Input: none.
    Output: Game results.
    */
    public void play() {
        boolean gameOver = false;
        startGame();
        askUser(true);
        String response = "";
        int roll = getRoll();
        while (response.equals("yes") && gameOver == false)
            getRoll();
        points = points + roll;
        displayPoints();
        if (points >= limit)
            gameOver = true;
        else {
            askUser(false);
        }
        displayResult();
    }

    public static void main(String[] args) {
        Blackjack practice = new Blackjack();
        practice.play();
    }
}

Answer 1

用户键入时没有得到响应。

我认为您可以像下面的代码一样更改askUser方法。

  public String askUser(boolean firstTime) {
     if (firstTime == true) 
          System.out.println("Start Playing?");

    else {
           System.out.println("Keep playing?");
    }
    String response = scan.next();
    return response;
} 

然后更改播放方法，例如：

public void play() {

    boolean gameOver = false;
    startGame();
    String response = askUser(true);
    ;
    ;
  }

Answer 2

我对您的代码做了一些小的更改。试试这个：

package stack;

import java.util.*;
public class Blackjack{

    private int points;
    private int limit;
    private Scanner scan;
    private boolean firstime = true; //new
    boolean gameOver; //new
    private String answer;//new

    public Blackjack(){
        scan = new Scanner(System.in);
    }

    /*Purpose: To print the current points and the limit.
      Input: Points and Limit
      Output: Points and Limit
    */
    public void displayPoints(){
        System.out.println("Your points:" + points+"/"+limit);
    }

   /*Purpose: To ask the user for the game limit.
      Input: Game limit
     Output: Entered limit
    */
    public void startGame(){//Changes
       if(firstime == true) {
            System.out.println("Start Playing?"); 
            answer = scan.next(); 
       }

       switch(answer) {
       case "yes":
           System.out.println("Enter point limit:");
           limit = scan.nextInt();
           int roll = getRoll();
           points = points + roll;
           displayResult();
           break;
       case "no":
           goodBye();
       } 
   }

   //New method
   public void goodBye() {
       System.out.println("Goodbye!");
       scan.close();
   }


   /*Purpose: To get the roll value from rolling a dice
     Input: Nothing
     Output: Random dice number
   */
   public int getRoll(){
       Random r = new Random();
       int roll = r.nextInt(6)+1;
       System.out.println("You rolled:" + roll);

       return roll;
   }   

   /* Purpose: to display the result of points in the game.
      Input: No input.
      Output: amount of points in the game.
   */
   public void displayResult(){//Changes
      if(points == limit) {
          gameOver = true;
          System.out.println("BlackJack!");
          displayPoints();
          System.out.println("Keep playing?");
          answer = scan.next();
      }
      else if (points > limit) {
          gameOver = true;
          System.out.println("Bust!");
          displayPoints();
          System.out.println("Keep playing?");
          answer = scan.next();
      }
      else if (points < limit) {
          gameOver = false;
          System.out.println("Stand at " + points + " points!"); 

      }
   }

   /*Purpose: to play all methods
     Input: none.
     Output: Game results.
   */

   public void play(){//Changes

       startGame();
       ENDWHILE:while(gameOver == true || gameOver == false) {
           if(answer.equals("yes")) {
               firstime = false;
               while(gameOver == true) {
                   points = 0;
                   startGame();
               }
               while(gameOver == false) {           
                   startGame();
               }

           }else {
               break ENDWHILE;
           }
       }

       goodBye();
   }

   public static void main(String [] args){
       Blackjack practice = new Blackjack();
       practice.play();
   }
}

Answer 3

这个正在工作..您在代码中注释了2个小错误。需要在{}中包装while循环内容。并且用户输入需要在askUser函数中作为字符串返回。以下代码可根据需要运行。

package javaapplication1;
  import java.util.*;




public class JavaApplication1 {

private int points;
    private int limit;
   private Scanner scan;

    public JavaApplication1(){
        scan = new Scanner(System.in);


    }

    public void displayPoints(){
        System.out.println("Your points:" + points+"/"+limit);
   }
   /*Purpose: To ask the user for the game limit.
      Input: Game limit
      Output: Entered limit
    */
   public void startGame(){
        System.out.println("Enter point limit:");
        limit = scan.nextInt();
        displayPoints();
   }

   public int getRoll(){
        Random r = new Random();
        int roll = r.nextInt(6)+1;
        System.out.println("You rolled:" + roll);
       return roll;
    }   

    public String askUser(boolean firstTime){

        if(firstTime == true)
        System.out.println("Start Playing?");

        else {
        System.out.println("Keep playing?");

      }

        return scan.next();
    }

    public void displayResult(){
        if(points == limit)
            System.out.println("BlackJack!");
        else if (points > limit)
            System.out.println("Bust!");
        else if (points < limit)
            System.out.println("Stand at " + points + " points!");  
    }



    public void play(){


        boolean gameOver = false;
        startGame();
        String resUser = askUser(true); // add a variable to catch the input //exp-"yes"
        String response = "";
        int roll = getRoll();

        while(resUser.equals("yes")&& gameOver == false){ // you forget the { and use //the variable to check if it is yess or not 
            getRoll();
            points = points + roll;
            displayPoints();


            if(points >= limit)
            gameOver =true;

            else{

            resUser = askUser(false);//catching the new user input 


            }

        }// you forget the }. if you are not wrapping the loop with {}, it will only //execute one line after the loop 

        displayResult();
    }

    public static void main(String [] args){
    JavaApplication1 practice = new JavaApplication1();

    practice.play();


    }



}