如果測驗中的輸入無效，如何讓用戶回答相同的問題-有解無憂

我正在為我的學校專案制作問答游戲。如果輸入無效，我很難讓用戶回答相同的問題。當所有問題都沒有有效輸入時，我想讓用戶回答相同的問題。

到目前為止，這是我的代碼：

import java.util.Scanner;

public class MainClass {

    public static void main(String[]args) {
    
        String quest1 = ("Who founded the company spaceX?\na: Will Smith\nb: Elon Musk\nc: Kevin Hart");
        String quest2 = ("Which sport is the most famous in the world?\na: Football\nb: Basketball\nc: Tennis");
        
        questionsAndAnswers [] questionAnswers = {          
                new questionsAndAnswers(quest1, "b"),
                new questionsAndAnswers(quest2, "a")
        };
    
        doQuiz(questionAnswers);
    }

    public static void doQuiz(questionsAndAnswers[] questionAnswers) {
        
        int points = 0;
        
        Scanner input = new Scanner(System.in);
        
        boolean looper = true;
        
        while (looper) {
            
            for(int i = 0; i < questionAnswers.length; i  ){
                System.out.println(questionAnswers[i].questions);
            
                String userAnswer = input.nextLine();
    
                if(!"a".equals(userAnswer) && !"b".equals(userAnswer) && !"c".equals(userAnswer)) {
                    
                    System.out.println("Invalid input, try again");
                    break;
                }
                
                else if(userAnswer.equals(questionAnswers[i].answers)) {            
                    points  ;
                    System.out.println("Correct! Your points:"   points);
                }
                continue;
            }
            looper = false;
        }
    }   
}

uj5u.com熱心網友回復：

到目前為止，代碼很棒。當用戶用無效答案回答問題時，您已經發現這很好，但是您想要做的是重新詢問用戶輸入，以便跟蹤用戶是否輸入了有效答案

boolean hasEnteredValidAnswer = false
while(!hasEnteredValidAnswer) {
    String userAnswer = input.nextLine();

    if("a".equals(userAnswer) || "b".equals(userAnswer) || "c".equals(userAnswer)) {
        hasEnteredValidAnswer = true                    
    }
    else {
        System.out.println("Invalid input, try again");
    }
}

uj5u.com熱心網友回復：

使用while回圈代替for回圈：

        int i = 0;
        while (i < questionAnswers.length){
            System.out.println(questionAnswers[i].questions);
        
            String userAnswer = input.nextLine();

            if(userAnswer.equals(questionAnswers[i].answers)) {            
                points  ;
                System.out.println("Correct! Your points:"   points);
                  i;
            } else {
                System.out.println("Invalid input, try again");
                // do not increment i
            }
        }

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