Best practice for global constants involving magic numbers

Question

To avoid magic numbers, I always use constants in my code. Back in the old days we used to define constant sets in a methodless interface which has now become an antipatter

Answer 1

Yes it is. Enum is the best choice.

You are getting for free:

• constants
• immutable objects
• singletons

All in one.

But wait, there's some more. Every enum value can have its own fields and methods. It's a rich constant object with behavior that allows transformation into different forms. Not only toString, but toInt, toWhateverDestination you need.