overriding implemented base class methods

Posted by user793468 on Programmers See other posts from Programmers or by user793468
Published on 2014-05-13T02:03:13Z Indexed on 2014/06/12 3:49 UTC
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object-oriented-design

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inheritance

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polymorphism

I read somewhere that the chain of inheritance breaks when you alter a behavior from derived class. What does "altering a behavior" mean here? Is overriding an already implemented method in base class considered as "altering behavior"? Or, does the author mean altering method signatures and the output?

Also, I ready Duplicating code is not a good practice, and its a maintenance nightmare. Again, does overriding an already implemented method in base class considered "Duplicating code"? If not, what would be considered as "Duplicating code"? I

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