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Comments
Peter Stofferis replied ago:
Good article although I don't agree with everything: the decision of using inheritance/composition and interface/(abstract)classes should be made depending on the solution you want to reach. I like coding against interfaces because it's an abstraction of the concrete class instances you're using. But I don't implement interfaces for everything, I try to decide if it's needed or not. Interfaces don't make (abstract)classes obsolete. Sometimes you need a combination of both to reach a good solution.
To make things easier I always think of interfaces as the interface/contract and (abstract) classes as the concrete implementation.
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