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){
        super(x,y);//调用父类构造方法初始化。

    }
    @Override //重写判断依据
    public void calculate(){
        if(super.getY()!=0){
 System.out.println(super.getX() /super.getY());//用super调用基类的属性，因为前面我们是用super初始化的构造方法。
        }
         else{
            System.out.print("Error");
         }
    }

}