随机字符串数组返回

Question

我尝试创建一个输出随机问题的代码。但是，我经常收到错误“不兼容的类型：Int 无法转换为问题”。我理解这个错误，但我无法为这种情况找到解决方案。我对此很陌生，所以我可能无法将给定的答案翻译成我自己的例子。错误在以下几行中：

        questions[i]=temp;
        temp = questions[index];

这个sn-p可以在以下代码中找到：

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

    System.out.println("Welcome to the geography quiz");
    System.out.println("Press a key to begin");            
    String start = keyboardInput.nextLine();

    String q1 = "What is the capital of Belgium?";
    String q2 = "\nWhat is the capital of Chile?";
    String q3 = "\nWhat is the capital of the Netherlands?";

    Question[]questions={
        new Question(q1, "Brussels", "No alternative"),
        new Question(q2, "Santiago de Chile", "Santiago"),
        new Question(q3, "Amsterdam", "No alternative")
    };

    takeTest(questions);
}

public static void takeTest(Question[]questions){
    int score = 0;
    int index, temp;
    Scanner keyboardInput = new Scanner(System.in);

    Random rnd = new Random();
    for(int i= questions.length -1; i>0; i--){
        index = rnd.nextInt(i+1);
        questions[index] = questions[i];
        questions[i]=temp;
        temp = questions[index];

        System.out.println(questions[i].prompt);
        String a = keyboardInput.nextLine();          

        if (a.equalsIgnoreCase(questions[i].answer)) {
            score++;
        }else if(a.equalsIgnoreCase(questions[i].alternative)){
            score++;
        }
    } 
    System.out.println("You got " + score + " out of " + questions.length);
}

感谢您的帮助！

Answer 1

你想要 temp 是 Question 类型吗？如果有帮助，请尝试下面的代码。

public static void takeTest(Question[]questions){
    int score = 0;
    int index;
    Question temp;
    Scanner keyboardInput = new Scanner(System.in);

    Random rnd = new Random();
    for(int i= questions.length -1; i>0; i--){
        index = rnd.nextInt(i+1);
        questions[index] = questions[i];
        questions[i]=temp;
        temp = questions[index];

        System.out.println(questions[i].prompt);
        String a = keyboardInput.nextLine();          

        if (a.equalsIgnoreCase(questions[i].answer)) {
            score++;
        }else if(a.equalsIgnoreCase(questions[i].alternative)){
            score++;
        }
    } 
    System.out.println("You got " + score + " out of " + questions.length);
}

Answer 2

在您的代码中，您将名为temp 的变量声明为int（即int index, temp;）。稍后，您尝试将temp 的值分配给questions[i]。但是questions[i] 属于Question 类型，而temp 属于int 类型。由于它们具有不同的类型，因此您不能分配给另一个。你可能想让temp 输入Question 而不是int。