Annotations on Interfaces?

Question

I can\'t figure out a use case for being able to annotate interfaces in Java.

Maybe someone could give me an example?

Answer 1

I use findbugs extensively. I find the use of annotations to specify Nullity constraints very useful. Even if you dont actually use findbugs, it makes the intent of the code much clearer. Those annotations have their place on Interfaces as much as Classes. You could argue that it is kind of programming by contract ...