Java の enum
って、思っていたより強力。
switch とか iterator とか使えるし、
enum Color { RED, BLUE; } public class Test { public static void main(String[] args) { Color c = Color.RED; String s="s"; switch (c) { case RED: break; case BLUE: s = "a"; break; default: ; } System.out.println(s + c); for ( Color cc : Color.values() ) System.out.println(cc); } }
実は class だし。
enum Color { RED (255, 0, 0), BLUE( 0, 0, 255); private final int r; private final int g; private final int b; Color(int r, int g, int b) { this.r = r; this.g = g; this.b = b; } public double red() { return (double)r/255; } public double green() { return (double)g/255; } public double blue() { return (double)b/255; } }