Java中的循環邏輯

Question

我沒有編程，我試圖回到事物的擺動，這是我得到了多少。我的問題是，我如何循環第二個問題，以便如果答案除了是或否，則再次提出問題。我曾試着圍繞if語句進行循環，但每當我嘗試獲得用戶的另一個響應時，它都會告訴我不能使用變量響應來這樣做。我覺得這對於我理解循環來說是一個簡單的解決方案，但是我很難在這個特定的問題上進行包裝，感謝您的提前。

import java.util.Scanner; 
public class Practice { 

    public static void main(String[] args) { 
     Scanner input = new Scanner(System.in); 
     System.out.println("Welcome to my simulation, please enter your name"); 
     String name = input.nextLine(); 
     System.out.println("Welcome " + name + " would you like to play a game?"); 
     String response = input.nextLine(); 


     boolean yes = new String("yes").equals(response.toLowerCase()); 
     boolean no = new String("no").equals(response.toLowerCase()); 


     if (yes){ 
      System.out.println("Which game woudl you like to play?"); 
     }else if (no){ 
      System.out.println("Fine then, have a good day!"); 
     } 
     else{ 
      System.out.println("please enter either yes or no"); 
     } 
    } 

} 

Answer 1

有很多方法可以做到這一點。下面是浮現在腦海的第一個：

while (true) { 
    response = input.nextLine().toLowerCase(); 
    if (response.equals("yes") { 
     System.out.println("Which game woudl you like to play?"); 
     break; 
    } else if (response.equals("no") { 
     System.out.println("Fine then, have a good day!"); 
     break; 
    } else { 
     System.out.println("please enter either yes or no"); 
    } 
} 

Answer 2

如何

do{ 
    String response = input.nextLine(); 
    boolean yes = new String("yes").equals(response.toLowerCase()); 
    boolean no = new String("no").equals(response.toLowerCase()); 
    if (yes){ 
     System.out.println("Which game woudl you like to play?"); 
    }else if (no){ 
     System.out.println("Fine then, have a good day!"); 
    } 
    else{ 
     System.out.println("please enter either yes or no"); 
    } 
}while(!response.equals("yes") && !response.equals("no")); 

Answer 3

while(response =! yes || response || no) 

這應該幫助！

Answer 4

首先，使其更容易對自己，你並不需要使用boolean變量。您可以簡單地使用.equals()方法來測試響應是否等於是或否。在這種情況下，如果else語句如下所示，將更容易使用：

if (response.equals("Yes")) 
{ 
    System.out.println("Which game woudl you like to play?"); 
} 

else if (response.equals("No")) 
{  
    System.out.println("Fine then, have a good day!"); 
} 

else if (!response.equals("Yes") && !response.equals("No")) 
{ 
    while (!response.equals("Yes") && !response.equals("No")) 
    { 
     System.out.println("please enter either yes or no"); 
     response = input.nextLine(); 
    } 
} 

希望這對您有所幫助。