156. 부모 타입 참조의 오버로딩 선택과 반환형

1class Meter {
2    long calc(long v) {
3        return v * 2;
4    }
5 
6    double calc(double v) {
7        return v / 2;
8    }
9}
10 
11class Gauge extends Meter {
12    int calc(int v) {
13        return v + 1;
14    }
15 
16    @Override
17    long calc(long v) {
18        return v * 3;
19    }
20}
21 
22public class Main {
23    public static void main(String[] args) {
24        Meter m = new Gauge();
25        Gauge g = new Gauge();
26        char c = 'B';
27        System.out.println(m.calc(5) + " " + g.calc(5));
28        System.out.println(m.calc(c) + " " + g.calc(c));
29        System.out.println(m.calc(9.0f) + " " + m.calc(6.0));
30        double d = g.calc(4);
31        System.out.println(d + m.calc(2));
32    }
33}