86. 생성자 사슬과 오버로딩 선택

1class Box {
2    int w;
3    int h;
4    String tag;
5 
6    Box() {
7        this(3);
8        tag += "A";
9    }
10 
11    Box(int side) {
12        this(side, side + 1);
13        tag += "B";
14    }
15 
16    Box(int w, int h) {
17        this.w = w;
18        this.h = h;
19        tag = "C";
20    }
21 
22    Box(String t) {
23        this(2, 5);
24        tag = t + tag;
25    }
26 
27    int area() {
28        return w * h;
29    }
30}
31 
32public class Main {
33    public static void main(String[] args) {
34        Box a = new Box();
35        Box b = new Box(4);
36        Box c = new Box("X");
37        System.out.println(a.tag + " " + a.area());
38        System.out.println(b.tag + " " + b.area());
39        System.out.println(c.tag + " " + c.area());
40    }
41}