我有一個完整的循環，不知道如何使它停止

Question

我的老師要求我們在Java 8中創建一個魔術8球程序。我們必須使用3個方法，一個主要的，一個處理和一個輸出，我們需要在這些方法之間傳遞參數。輸出需要使用switch語句，我們需要在那裏有一個while語句，並且需要隨機生成答案。我有所需的一切，但是當我嘗試運行該程序時，它被卡在while循環中，我不知道我做錯了什麼。 這是我有：

import java.util.*; 
public class Magic8Ball { 
    public static void main(String[]args) { 
     Scanner input = new Scanner(System.in); 
     System.out.print("Would you like to ask a question? Y or N: "); 
     char answer = input.next().charAt(0); 
     char Y = Character.toUpperCase(answer); 
     process(answer, Y); 
    } 
    public static void process(char a, char Yes) { 
     if (a != Yes) { 
      System.out.println("Thank you, goodbye."); 
     } else { 
      while(a==Yes) { 
       System.out.print("Ask your question: "); 
       Random random = new Random(); 
       int ran = random.nextInt(8-1+1)+1; 
       output(ran); 
      } 
     } 
    } 
    Public static int output(int r) { 
     switch (r) { 
     case 1: System.out.println("Out of memory, try again later); break; 
     case 2: System.out.println("The probability matrix supports you."); break; 
     case 3: System.out.println("That does not compute."); break; 
     case 4: System.out.println("System error, try again later"); break; 
     case 5: System.out.println("Siri says yes."); break; 
     case 6: System.out.println("The asnwer could not be found on the internet."); break; 
     case 7: System.out.println("Wikilinks claims it is true."); break; 
     case 8: System.out.println("Siri says no."); break; 
     default: System.out.println("The system is not responding, try again later"); break; 
     } 
     return r; 
    } 
} 

Answer 1

首先。有很多錯字在你的示例代碼，你必須關閉「在你的方法output()第一個print語句的結束。二錯誤，Java是區分大小寫，因此Public是不一樣的public

現在，讓我們試着給你的這個問題簡單的解決方案可能是這一個簡單的解決方案：在while循環的末尾添加回報，你可以在下面的代碼中看到

while(a == Yes) { 
    System.out.print("Ask your question: "); 
    Random random = new Random(); 
    int ran = random.nextInt(8-1+1)+1; 
    output(ran); 
    return; 
} 

這樣你停止循環打印第一個輸出後

請記住，return是一個「魔法世界」，你可以用它來告訴你的方法停下來並返回一個結果（在這種情況下，你沒有結果，因爲該方法返回一個void）。

它爲我，讓我知道，如果這是你的問題;-)

Answer 2

import java.util.*; 
public class Magic8Ball { 

    public static void main(String[]args) { 

     System.out.print("Would you like to ask a question? Y or N: "); 
     Scanner infeedScanner = new Scanner(System.in); 
     char input = infeedScanner.next().charAt(0); 
     process(input, 'Y'); 
    } 

    public static void process(char a, char Yes) 
    { 
     if (a != Yes) 
     { 
     System.out.println("Thank you, goodbye."); 
     } 
     else 
     { 
      boolean bContinue = true; 

      while(bContinue) 
      { 
       System.out.print("Ask your question: "); 
       Random random = new Random(); 
       int ran = random.nextInt(8-1+1)+1; 
       output(ran); 

       System.out.print("Would you like to ask another question? Y or N: "); 
       Scanner infeedScanner = new Scanner(System.in); 

       if (infeedScanner.next().equalsIgnoreCase("n")) 
       { 
        bContinue = false; 
       } 
      } 
     } 
    } 

    public static int output(int r) 
    {  
     switch (r) { 
      case 1: System.out.println("Out of memory, try again later"); break; 
      case 2: System.out.println("The probability matrix supports you."); break; 
      case 3: System.out.println("That does not compute."); break; 
      case 4: System.out.println("System error, try again later"); break; 
      case 5: System.out.println("Siri says yes."); break; 
      case 6: System.out.println("The answer could not be found on the internet."); break; 
      case 7: System.out.println("Wikilinks claims it is true."); break; 
      case 8: System.out.println("Siri says no."); break; 
      default: System.out.println("The system is not responding, try again later"); break; 
     } 

     return r; 
    } 
}