Class presets (Like Color.Red)

Question

I've been trying to create predefined classes several times in different languages but I couldn't find out how.

This is one of the ways I tried it:

public class Color{
    public float r;
    public float r;
    public float r;

    public Color(float _r, float _g, float _b){
        r = _r;
        g = _g;
        b = _b;
    }
    public const Color red = new Color(1,0,0);
}

This is in C# but I need to do the same in Java and C++ too so unless the solution is the same I would like to know how to do it in all of those.

EDIT: that code did not work, so the question was for all three languages.I got working answers for C# and Java now and I guess C++ works the same way, so thanks!

Answer 1

I think a good way in C++ is use static members :

// Color.hpp
class Color
{
  public:
    Color(float r_, float g_, float b_) : r(r_), g(g_), b(b_) {}
  private: // or not...
    float r;
    float g;
    float b;

  public:
    static const Color RED;
    static const Color GREEN;
    static const Color BLUE;
};

// Color.cpp
const Color Color::RED(1,0,0);
const Color Color::GREEN(0,1,0);
const Color Color::BLUE(0,0,1);

In your code, you access them like Color c = Color::RED;