subclass that implements

I have a problem where i have to add 2 interfaces into class hierarchy of 1 main class.

it reads: Simulate multiple inheritance by adding at least two
interfaces into your class hierarchy.

However As far as I know you can't implement and extend at the same time. You are creating a main class followed by 4 subclasses. I know i could implement one interface on the main class but how would I do this for the subclasses?

Is creating an abstract class what she means I wonder?

You can extend a single class and implement as many classes as you want.

Code:

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class x extends y implements a, b, c, d

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that is fine.