Java interface static method workaround?

Question

We have a given REST interface:

POST /calculation
abc

This calculation can be implemented by different logical \"c

Answer 1

Why do you think the methods should be static? They surely could be, but that would limit you in terms of plugging in a different implementation later. If you are concerned about memory consumption or the like, using a Singleton would do the same as static for you, as you already said in the last paragraph of your question.