java - 不在 if/else 语句中打印我的代码

Question

所以我在 java 中创建了 jeapordy，我不在乎我拼错了(如果我拼错了)但我只有一个问题编码，只有一个答案，它提出问题但只打印出你错了即使答案是正确的。

它问的是第一个历史问题，答案是 george，但打印出来的答案是错误的。第一道历史题也是100分，数学部分我还没开始写代码。

如果你能帮助解决我的问题，谢谢!它可能真的很简单，因为我是初学者。

import java.util.Random;
import java.util.Scanner;

public class game {
public static void main (String[] args){
    //Utilites
    Scanner s = new Scanner(System.in);
    Random r = new Random();

    //Variables
    String[] mathQuestions;
    mathQuestions = new String[3];
    mathQuestions[0] = ("What is the sum of 2 + 2");
    mathQuestions[1] = ("What is 100 * 0");
    mathQuestions[2] = ("What is 5 + 5");

    String[] historyQuestions;
    historyQuestions = new String[3];
    historyQuestions[0] = ("What is General Washingtons first name?");
    historyQuestions[1] = ("Who won WWII, Japan, or USA?");
    historyQuestions[2] = ("How many states are in the USA?");


    //Intro
    System.out.println("Welome to Jeapordy!");
    System.out.println("There are two categories!\nMath and History");
    System.out.println("Math       History");
    System.out.println("100          100");
    System.out.println("200          200");
    System.out.println("300          300");


    System.out.println("Which category would you like?");
        String categoryChoice = s.nextLine();
    System.out.println("For how much money?");
        int moneyChoice = s.nextInt();
            if (categoryChoice.equalsIgnoreCase("history")){
                if (moneyChoice == 100){
                    System.out.println(historyQuestions[0]);
                    String userAnswer = s.nextLine();
                    s.nextLine();
                    if (userAnswer.equalsIgnoreCase("george")){
                        System.out.println("Congratulations! You were right");
                    }
                    else{
                        System.out.println("Ah! Wrong answer!");
                    }

                }
            }

        }
}

Answer 1

当您调用 nextInt() 时，换行符未被读取，因此后续调用 nextLine() 将返回一个空字符串(因为它读取到该行的末尾)。在读取/丢弃此尾随换行符之前调用一次 newLine():

if (moneyChoice == 100) {
    System.out.println(historyQuestions[0]);
    s.nextLine();  // <--
    String userAnswer = s.nextLine();
    System.out.println(userAnswer);
    ...

顺便说一句，不要忘记在完成后关闭您的Scanner:s.close()。