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Question

我试图让它在玩完游戏并确定胜出者后，会询问用户是否想再次玩。我添加了“do while”循环，但似乎没有工作。输出始终是沿着线的东西：

• 玩游戏
• 获得冠军/输/领带和得分
• 问你要选择再次
• 什么，如果用户想接着问发挥再次
• 即使用户说不，它不会停止游戏

我不知道是什么问题，因为我很新的编码。谢谢！

/* 
Playing Rock Paper Scissors against a computer would be really boring if we 
always knew what the computer was going to choose, or we created a program 
that has a distinct pattern. In order to increase replayability of your game 
you will want to randomize the computer's choice. 

For our game we will have the computer generate a random number (0, 1, or 2) 
which will correspond to one of the choices (i.e. 0 = Rock, 1 = Paper, 2 = 
Scissors) 
*/ 

import javax.swing.*; 
public class rockPaperScissors { 

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String[] args) { 
     int playAgain = 0; 
     int score = 0; 
     String [] playerOptions = {"Rock","Paper","Scissor"}; 
     String playerChoice = (String)JOptionPane.showInputDialog(null,"1, 2, 3, Shoot:", 
       "Rock, Paper, Scissor",JOptionPane.QUESTION_MESSAGE,null,playerOptions,playerOptions[0]);//Gets players pick 
     int computerChoice = (int)(Math.random()*(3));//gets computers choice randomly 
     while (playerChoice.equals("Rock") || playerChoice.equals("Paper") || playerChoice.equals("Scissors")) { 

      do { 
       if (computerChoice == 0 && playerChoice.equals("Rock")) { 
        JOptionPane.showMessageDialog(null,"Tied! You both chose rock.");//determines winner and prints only for tied and wins for user 
        System.out.println(score); 

        playerChoice = (String)JOptionPane.showInputDialog(null,"1, 2, 3, Shoot:", 
          "Rock, Paper, Scissor",JOptionPane.QUESTION_MESSAGE,null,playerOptions,playerOptions[0]); 
       } else if (computerChoice == 0 && playerChoice.equals("Paper")) { 
        JOptionPane.showMessageDialog(null,"You won!"); 

        score = score+1; 
        System.out.println(score); 

        playerChoice = (String)JOptionPane.showInputDialog(null,"1, 2, 3, Shoot:", 
          "Rock, Paper, Scissor",JOptionPane.QUESTION_MESSAGE,null,playerOptions,playerOptions[0]); 
       } else if (computerChoice == 1 && playerChoice.equals("Paper")){ 
        JOptionPane.showMessageDialog(null,"Tied! You both chose Paper!"); 
        System.out.println(score); 

        playerChoice = (String)JOptionPane.showInputDialog(null,"1, 2, 3, Shoot:", 
          "Rock, Paper, Scissor",JOptionPane.QUESTION_MESSAGE,null,playerOptions,playerOptions[0]); 
       } else if (computerChoice == 1 && playerChoice.equals("Scissor")){ 
        JOptionPane.showMessageDialog(null,"You won!"); 
        score = score+1; 
        System.out.println(score); 

        playerChoice = (String)JOptionPane.showInputDialog(null,"1, 2, 3, Shoot:", 
          "Rock, Paper, Scissor",JOptionPane.QUESTION_MESSAGE,null,playerOptions,playerOptions[0]); 
       } else if (computerChoice == 2 && playerChoice.equals("Scissor")) { 
        JOptionPane.showMessageDialog(null,"Tied! You both chose scissor!"); 
        System.out.println(score); 

        playerChoice = (String)JOptionPane.showInputDialog(null,"1, 2, 3, Shoot:", 
          "Rock, Paper, Scissor",JOptionPane.QUESTION_MESSAGE,null,playerOptions,playerOptions[0]); 
       } else if (computerChoice == 2 && playerChoice.equals("Rock")){ 
        JOptionPane.showMessageDialog(null,"You won!"); 
        score = score+1; 
        System.out.println(score); 

        playerChoice = (String)JOptionPane.showInputDialog(null,"1, 2, 3, Shoot:", 
          "Rock, Paper, Scissor",JOptionPane.QUESTION_MESSAGE,null,playerOptions,playerOptions[0]); 
       } else { //if user lost 
        JOptionPane.showMessageDialog(null,"You lost! Try again!"); 
        score = score-1; 
        System.out.println(score); 

        playerChoice = (String)JOptionPane.showInputDialog(null,"1, 2, 3, Shoot:", 
          "Rock, Paper, Scissor",JOptionPane.QUESTION_MESSAGE,null,playerOptions,playerOptions[0]); 
       } 
       playAgain = JOptionPane.showConfirmDialog(null, "Play again?"); 
      } while (playAgain == 0); 
     } 
     System.out.println("Game Ended"); 
     System.exit(0); 
    } 
} 

Answer 1

你的循环是围绕

while (playerChoice.equals("Rock") || playerChoice.equals("Paper") || /*...*/) 
{ 
    do { 
     // did they win? 
     // ... 
     playAgain = JOptionPane.showConfirmDialog(null, "Play again?"); 
    } while (playAgain == 0); 
} 

你要非常例如四处移动do-while循环的所有游戏的逻辑错误的方式

do { 
    // get input and computer choice 
    while (playerChoice.equals("Rock") || playerChoice.equals("Paper") || /*...*/) 
    { 
     // did they win? 
     // ... 
    } 
    playAgain = JOptionPane.showConfirmDialog(null, "Play again?"); 
} while (playAgain == 0);