What happens to private data?

Hello everybody,
This question is purely out of curiosity, but it just came to me:
Lets say you have a class that has some data and, say, methods "foo" and "bar" are the only ones to manipulate that data. I say this in a sense where that data would be useless, totally inaccessible, if those two methods were to be overridden. Now lets say they are. For some reason, some sub-class would need to implement the same functionality in some other way, overrides those methods and uses an entirely new set of data. Does the previous, private/protected data, get "shipped" with the child class anyway? Is there some kind of optimization to detect this situation and disregard the data as usable? Or is that not possible, for some reason? If you were facing a problem like that in your designs (ie, the class you are extending as not been written by you, so you either have to "play along" or you just don't know about it), how would you solve it?
I know that the GC could do it. So the main question is: does it?
Kind regards ;)
Fratelli

That's not very good design either. Make all your base classes with weak references so people can extend them, ignoring their fields, and allow those fields to be garbage collected? What if the superclass needs that one reference to keep the value? When you design a class, you should know whether you plan for it to be extended or not, and if the answer is yes, then you should know how it's meant to be extended. If there's a field that could reasonably be ignored by a subclass, then it shouldn't be there at all -- rather, you should provide a specific subclass using that field, so other subclasses can branch off the superclass that doesn't have it. If the field in question is integral to the functioning of the superclass... then unless a weak reference is part of the semantics of the superclass, it shouldn't use a weak reference, and if a subclass wants to use the superclass but ignore that field, then the subclass is being poorly designed. You can't compensate for unknown future bad design in advance, aside from just making it more difficult.

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What happens to private data?

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