题解 | #重写父类方法#

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);
        System.out.println(sub.sum());
    }
}

}

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 final int getY() {
    return y;
}

public final int sum() {
    return getX() + getY();
}

}

class Sub extends Base {

public Sub(int x, int y) {
    super(x, y);
}

public int getX() {
    return 10*super.getX();
}

}