java - 重写方法中使用的子类中的变量

Question

父类(super class):

public class question1 {
static Scanner input= new Scanner(System.in);
static int score = 0;
static ArrayList<String> results = new ArrayList<String>();
static String question = "1. Which one of the following is classified as an economic resource? \n A) Consumption \n B) Productivity \n C) Production \n D) Enterprise";
static String answer = "D";

protected void question() {
    System.out.println(question);
    String message = input.nextLine();
            Answer(message);
    }
protected void Answer(String message) {
    if (message.equals("answer")) {
            score++;
            results.add("1." + "Correct\n\n");
            }else{ 
            results.add(question + "\n Incorrect - D\n\n");
            }
    }

public question1() { }

public question1(String newQuestion, String newAnswer) {
    question = newQuestion;
    answer = newAnswer;
    }
}

子类:

public class question2 extends question1 {
String question = "2. Which one of the following is classified as a supply side policy? \n A) A reduction in the rate of interest to reduce inflation \n B) An increase in goverment expenditure on state pensions \n C) A reduction in company taxes to encourage greater investment \n D) A rise in the exchange rate to increase exports";
String answer = "C";

public question2() {
}

public question2(String question, String answer) {
    super(question, answer);
}

}

主要:

public class Paper {
public static void main(String args[]) {
    question1 q1 = new question1();
    question2 q2 = new question2();
    q1.question();
    q2.question();
}
}

当从使用 Question2 类创建的 q2 对象调用 question(); 方法时，将使用 Question1 类中的“answer”和“question”变量值，而不是来自的变量值Question2类，这是为什么？

Answer 1

question2 必须重写 question() 方法才能使用 question2 中声明的字段。 q2.question(); 执行 question1 中的实现(由 question2 继承，未覆盖)，它不知道子类。