228. 추상 클래스와 오버로딩된 메서드 호출

1abstract class Vehicle {
2    abstract int wheels();
3    String move() {
4        return "go";
5    }
6}
7class Bike extends Vehicle {
8    int wheels() {
9        return 2;
10    }
11    String move(int km) {
12        return "ride " + km;
13    }
14}
15public class Main {
16    public static void main(String[] args) {
17        Bike b = new Bike();
18        System.out.println(b.move() + " " + b.wheels());
19        System.out.println(b.move(3));
20    }
21}