Java枚举反向查找最佳实践

enum Color {
    RED, GREEN, BLUE;
}

Color color = Color.valueOf("RED");

enum Color {
    RED, GREEN, BLUE;
}

Color color = Color.values()[0];

enum Color {
    RED(0xFF0000), GREEN(0x00FF00), BLUE(0x0000FF);

    private int rgb;

    Color(int rgb) {
        this.rgb = rgb;
    }

    public static Color fromRGB(int rgb) {
        for (Color color : Color.values()) {
            if (color.rgb == rgb) {
                return color;
            }
        }
        throw new IllegalArgumentException("Invalid RGB value: " + rgb);
    }
}

Color color = Color.fromRGB(0x00FF00);

enum Color {
    RED(0xFF0000), GREEN(0x00FF00), BLUE(0x0000FF);

    private int rgb;

    Color(int rgb) {
        this.rgb = rgb;
    }

    private static final Map<Integer, Color> COLOR_MAP = new HashMap<>();

    static {
        for (Color color : Color.values()) {
            COLOR_MAP.put(color.rgb, color);
        }
    }

    public static Color fromRGB(int rgb) {
        Color color = COLOR_MAP.get(rgb);
        if (color == null) {
            throw new IllegalArgumentException("Invalid RGB value: " + rgb);
        }
        return color;
    }
}

Color color = Color.fromRGB(0x00FF00);