Should I still code to the interface even if I am ONLY EVER going to have ONE implementation?

Question

I think the title speaks for itself guys - why should I write an interface and then implement a concrete class if there is only ever going to be 1 concrete implementation of that interface?

Answer 1

I think you shouldn't ;)

There's no need to shadow all your classes with corresponding interfaces.

Even if you're going to make more implementations later, you can always extract the interface when it becomes necessary.