题解 | #重写计算逻辑#

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNextInt()) {
            int x = scanner.nextInt();
            int y = scanner.nextInt();
            Sub sub = new Sub(x, y);
            sub.calculate();
        }
    }

}

class Base {

    private int x;
    private int y;

    public Base(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    public void calculate() {
        System.out.println(getX() * getY());
    }

}

class Sub extends Base {

    //write your code here......
        public Sub(int x,int y){    //创建带参构造方法，因为在Main()方法中，子类的初始化是带参
            super(x,y); // 子类初始化之前，一定要先完成父类数据的初始化
        };

        //重写方法calculate()
        @Override
        public void calculate() {
            if (super.getY() != 0){
                System.out.println(  super.getX() / super.getY() );
            }
            else{
                System.out.println("Error");
            }
        
    }


}