Separation of concerns

Hi everyone,
I am currently quite confused about the separation of concerns things
and search here for enlightenment.
I have some classes. lets say A and B that shall implement a certain
interface (e.g. Drawable).
Now it would not be very nice if A and B would implement then directly
or?
Should I subclass like A_Draw and B_Draw or what is the current
pattern to solve this?

Thanks a lot in advance,
Thomas Kowalski

.

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