221. 제네릭 필드와 오버로딩 선택 기준

1class Box<T> {
2    T item;
3    Box(T item) {
4        this.item = item;
5    }
6}
7 
8public class Main {
9    static String f(Object o) {
10        return "O";
11    }
12 
13    static String f(String s) {
14        return "S";
15    }
16 
17    public static void main(String[] args) {
18        Box<String> b1 = new Box<>("hi");
19        Box<Object> b2 = new Box<>("hi");
20        String r = f(b1.item) + f(b2.item);
21        Object x = b1.item;
22        r += f(x) + f((String) x);
23        System.out.println(r);
24    }
25}