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Java Forum / General / October 2006is it possible to make superclass extend another class ?
Hi all, I have Class A as superclass. I have Class B extend Class A Then Class C extend Class B Is it possible to make Class A Extend Class D ? Thank you, xtanto ... > I have Class A as superclass. > > I have Class B extend Class A > Then Class C extend Class B > > Is it possible to make Class A Extend Class D ? Sure. So long as D extends none of A, B or C. BTW - are you sure this is the best design? A lot of layers of 'extends' sometimes suggests 'no'. (and those are silly class names - even for an abstraction) Andrew T. > ... > > I have Class A as superclass. [quoted text clipped - 11 lines] > > Andrew T. > ... >> I have Class A as superclass. [quoted text clipped - 11 lines] > > Andrew T. A couple of additional restrictions: A must be a class you can change. A's immediate superclass must also be a superclass of D, trivially true if A is a direct subclass of Object. I share Andrew's doubts about a design with that many layers. Patricia Hi, Thank you for your response. > I share Andrew's doubts about a design with that many layers. As a rule of thumb, how many is indicating too many ? Thank you, xtanto > > ... > >> I have Class A as superclass. [quoted text clipped - 22 lines] > > Patricia [Rearranged to avoid top posting confusion] >>> ... >>>> I have Class A as superclass. [quoted text clipped - 28 lines] > > As a rule of thumb, how many is indicating too many ? I don't think there is any rule of thumb, but an increasing queasiness as the number of inheritance levels increases. We have at least 5 levels here (Object, D, A, B, C). Whether it makes sense to go that deep depends on what the classes are about, but it is deep enough that I would question it in my own code. Patricia Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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