Question

我试图创建一个输出随机问题的代码。但是，不断出现错误“不兼容的类型：Int无法转换为Question”。我理解该错误，但是在这种情况下我无法解决该问题。我对此并不陌生，所以可能是我无法将给出的答案转换为我自己的示例。错误在以下行中：

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

此代码段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

在代码中，将名为temp的变量声明为int（即int index, temp;）。稍后，您尝试为questions[i]分配temp的值。但是questions[i]的类型为Question，而temp的类型为int。由于它们的类型不同，因此您无法分配给其他类型。您可能希望使temp的类型为Question，而不是int。

Answer 2

您是否希望 temp 是问题类型？如果有帮助，请尝试下面的代码。

   myVC.view.constraints.forEach { (constraint) in
        if constraint.firstAttribute == .height
        {
            constraint.constant = newHeight
        }
    }

随机字符串数组返回

2 个答案: