What name to give to the interface in this case?

Question

Java

Hello.
Please help with the naming of interface-repositories in android.
There are two kinds of entities - users and books. I would like to write something like this:

interface IUsersRepository {}
class UsersRepository implements IUsersRepository {}

interface IBooksRepository {}
class BooksRepository implements IBooksRepository {}

But as far as I understand, in java it is not customary to add the prefix "I" to the names of interfaces. What names would you use in this case? Thank you.

Answer 1

Interfaces: BooksRepository and UserRepository
Classes: BooksRepositoryImpl and UserRepositoryImpl