錯誤答案后重復

Question

今天，我四處亂逛，試圖創建一個多項選擇測試。 我到此為止，並且有效。 但是我在想，如果用戶得到錯誤的答案，我該如何重復這個問題？ 如果有人可以幫助我，那就太好了！ 謝謝！

import java.util.Scanner;
public class multipleChoiceTest {

    public static void main(String[] args) {
        Scanner myScanner = new Scanner(System.in);

        System.out.println("What color is the sky?");
        System.out.println("A. Blue");
        System.out.println("B. Green");
        System.out.println("C. Yellow");
        System.out.println("D. Red");
        String userChoice = myScanner.nextLine();

        if (userChoice.equalsIgnoreCase("a")) {
            System.out.println("You're right!");
        } else {
            System.out.println("You're wrong! Try Again.");

        }
     } 

Answer 1

在這種情況下，您可以使用While語句！ 讓我們這樣看：只要用戶回答不正確，您就不會繼續。 現在，將“只要”更改為“ while（...）”，我們將獲得以下代碼：

Scanner myScanner = new Scanner(System.in);
System.out.println("What color is the sky?");
System.out.println("A. Blue");
System.out.println("B. Green");
System.out.println("C. Yellow");
System.out.println("D. Red");
String userChoice = myScanner.nextLine();

while(! userChoice.equalsIgnoreCase("a")){
  System.out.println("You're wrong! Try Again."); 
  userChoice = myScanner.nextLine();
}
System.out.println("You're right!");

（請記住，他上次輸入錯誤后，我們需要重新輸入！）

Answer 2

public static void main(String[] args) 
{
    Scanner myScanner = new Scanner(System.in);

    System.out.println("What color is the sky?");
    System.out.println("A. Blue");
    System.out.println("B. Green");
    System.out.println("C. Yellow");
    System.out.println("D. Red");

    while(true) // Infinite loop
    {
          String userChoice = myScanner.nextLine();

          if (userChoice.equalsIgnoreCase("a"))
          {
              System.out.println("You're right!");
              break; // If user was correct, exit program
          } 
          else
          {
              System.out.println("You're wrong! Try Again.");
          }
    }
}