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I moved responsibility from the list to the B and C class. Now the list does not need to know whether the A is in fact a B or C. So this question is no longer relevant.

Thanks for your help Kevin.

When adding an element to the ArrayList I know that it is either a B or a C. Before actually adding it I need to check if that B or C is already contained by the ArrayList. So ArrayList.add() which I...

But this means I need to implement MyArrayList two times for exactly the same functionality. Is there no other way?

I believe type casting indicates a bad design...

Then how will the get method now whether to return an object of the type B or C?

Hi,

I need to do the following.

Suppose I have a class A and class B and C are subtypes of A.

I want to implement an ArrayList that contains subtypes of A. But I only want to implement this...