37. 오버로딩과 오버라이딩의 선택 시점

1class Shape {
2    String draw(Shape s) {
3        return "S(S)";
4    }
5 
6    String draw(Circle c) {
7        return "S(C)";
8    }
9}
10 
11class Circle extends Shape {
12    String draw(Shape s) {
13        return "C(S)";
14    }
15}
16 
17public class Main {
18    public static void main(String[] args) {
19        Shape a = new Circle();
20        Circle b = new Circle();
21        Shape c = new Shape();
22        String r1 = a.draw(a);
23        String r2 = a.draw(b);
24        String r3 = c.draw(a);
25        String r4 = b.draw((Shape) b);
26        System.out.println(r1 + " " + r2);
27        System.out.println(r3 + " " + r4);
28    }
29}