Java中的循环逻辑

Question

我没有编程，我试图回到事物的摆动，这是我得到了多少。我的问题是，我如何循环第二个问题，以便如果答案除了是或否，则再次提出问题。我曾试着围绕if语句进行循环，但每当我尝试获得用户的另一个响应时，它都会告诉我不能使用变量响应来这样做。我觉得这对于我理解循环来说是一个简单的解决方案，但是我很难在这个特定的问题上进行包装，感谢您的提前。

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这一点。下面是浮现在脑海的第一个：

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) 

这应该帮助！

Answer 4

首先，使其更容易对自己，你并不需要使用boolean变量。您可以简单地使用.equals()方法来测试响应是否等于是或否。在这种情况下，如果else语句如下所示，将更容易使用：

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(); 
    } 
} 

希望这对您有所帮助。