java - 错误答案后重复

Question

今天我在胡闹，我试图创建一个多项选择测试。我做到了这一点并且它有效。不过我想知道，如果用户答错了，我该如何让它重复这个问题？如果有人能帮助我，那就太棒了!谢谢!

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

在这种情况下，您可以使用 While 语句!我们这样看:只要用户没有回答正确，你就不会继续。现在将“只要”更改为“while(...)”我们将得到这段代码:

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!");

(记住，在他上次输入错误后，我们需要重新输入!)