頭或尾巴游戲 - 循環問題

Question

import java.util.Scanner; 
import javax.swing.JOptionPane; 
public class Coin { 
    public static void main(String[] args) 
    { 
     boolean validFinalInput = false; 
     boolean validBetInput = false; 
     boolean validGuessInput = false; //Determines if the guess is a valid input 
     boolean validBet = false; //Determines if the bet is valid 
     boolean goAgain = true; 
     double num; //Unparsed Side Determiner 
     double balance = 100; 
     String Bet = null; //Bet Input 
     double bet = 0; //Parsed Bet 
     String Guess = null; //H or T 
     String Side = null; //Determines Side 
     String GoAgain = null; //Y/N Retry input 
     Scanner in = new Scanner(System.in); 

     while (goAgain == true){ //While true, the player will keep playing. 
      num = Math.round(Math.random()); //Declares Number 
      if (num == 1){ 
       Side = "H"; 
      } else if (num == 0){ 
       Side = "T"; 
      } 
      while (validGuessInput == false){ //Determines if the input is valid 
       System.out.println("Guess: (H/T)"); 
       Guess = in.next(); 
      if (Guess.equals("H") || Guess.equals("T")){ 
       validGuessInput = true; 
      } else { 
       JOptionPane.showMessageDialog(null, "Invalid Guess!"); 
       validGuessInput = false; 
      } 
     } 
     while (validBet == false){ 
      while (validBetInput == false){ 
       try { 
        System.out.println("Bet? (Your balance is $" + balance); 
        Bet = in.next(); 
        bet = Double.parseDouble(Bet); 
        if (bet > 0){ 
         validBetInput = true; 
        } 
       } catch (NumberFormatException e) { 
        JOptionPane.showMessageDialog(null, "Invalid Bet!"); 
       } 
      } 
      if (bet <= balance && bet >= 0){ 
       validBet = true; 
      } else { 
       JOptionPane.showMessageDialog(null, "Invalid Bet!"); 
       validBet = false; 
      } 
     } 
     if (Guess.equals(Side)){ 
      balance = balance + (bet * 2); 
      System.out.println("Correct! The side was: " + Side); 
      System.out.println("Your balance is now: $" + balance); 
     } else { 
      balance = balance - bet; 
      System.out.println("Incorrect! The side was: " + Side); 
      System.out.println("Your balance is now: $" + balance); 
     } 
     if (balance == 0){ 
      System.out.println("You ran out of money. Ending Game."); 
      break; 
     } 
     System.out.println("Go again? (Y/N)"); 
     GoAgain = in.next(); 
     while (validFinalInput == false); 
      System.out.println("Go again? (Y/N)"); 
      GoAgain = in.next(); 
      validGuessInput = false; 
      validBet = false; 
      validBetInput = false; 
     if (GoAgain.equals("Y")){ 
      goAgain = true; 
      validFinalInput = true; 
     } else if (GoAgain.equals("N")){ 
      goAgain = false; 
      validFinalInput = true; 
      System.out.println("Thanks for playing! You ended with: $" + balance); 
     } else { 
      System.out.println("Invalid Input!"); 
      } 
     } 
    } 
} 

所以我寫了這個代碼爲「頭或尾巴」風格的遊戲。它最初的工作，但後來我決定添加一些功能，它破壞。基本上，它到了最後，但卡在最後一個輸入（Y/N）上。

有人能告訴我我做錯了什麼嗎？

對缺乏評論感到抱歉。

我也意識到我的變量並不完全遵循約定，所以也很抱歉。

謝謝。

Answer 1

1. 在這裏刪除分號;

   while (validFinalInput == false);

2. 正確縮進您的代碼。

3. 檢查你的邏輯在這裏;您正在爲兩個條件（true和false）設置validFinalInput = true。

   if（GoAgain.equals（「Y」））{ ......... validFinalInput = true; }

   else if（GoAgain.equals（「N」））{ ....... validFinalInput = true; }

Answer 2

goAgain的值在以while (goAgain == true){開頭的循環中永遠不會改變，因爲它在while (validBet == false){之前以}結尾。該右括號錯位。

Answer 3

你有這個while語句

while (validFinalInput == false); 

這是一個無限循環！由於分號，它永遠不會通過這部分代碼。如果你像這樣重寫它，它應該可以工作：

 while (validFinalInput == false) 
    { 
     System.out.println("Go again? (Y/N)"); 
     GoAgain = in.next(); 
     validGuessInput = false; 
     validBet = false; 
     validBetInput = false; 
     if (GoAgain.equals("Y")) 
     { 
     goAgain = true; 
     validFinalInput = true; 
     } 
     else if (GoAgain.equals("N")) 
     { 
      goAgain = false; 
      validFinalInput = true; 
      System.out.println("Thanks for playing! You ended with: $" + balance); 
     } 
     else 
     { 
      System.out.println("Invalid Input!"); 
     } 
    }