In my package

a.b.c

, I have an

abstract

class named

BaseUser

which I use it to share some code. But I want this class

BaseUser

to be internal in the

a.b.c

. Such that, I can create

User:BaseUser

in

a.b.c

. But the user of package can’t refer

a.b.c.BaseUser

. I tried the

protected

modifier. Not work, when I try to build, it said

This type is final, so it cannot be inherited from

,

Cannot access 'BaseUser': it is protected in 'a.b.c'

and

'public' subclass exposes its 'protected (in ?)' supertype BaseUser

. No luck with

internal

too How to make this work? 🤔

you cant make this work like your thinking, if you make object X public, then its entire superclass tree must also be public in kotlin

Thanks.

Use composition instead of inheritance to dothat

@gildor Thanks. More hints for this? 😄

Do not extend class, but create an instance of private class inside of your public class and delegate method calls