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Consider this class hierarchy:
Book extends GoodsBook implements TaxableAs we know, there is a relationship between a subclass and its superclass (is-a).
Q: Is there any relationship like “is-a” between Book and Taxable?
GOOD Answers, but you said that “is-a” is also a relationship between Book and Taxable, but “is-a” is a relation between classes, and an interface is not a class!
Yes. The relationship is exactly the same
Book is a Taxable too.
EDIT
An interface is an artifact that happens to match Java’s ( and probably C# I don’t know )
interfacekeyword.In OO interface is the set of operations that a class is ‘committed’ perform and nothing more. Is like a contract between the object class and its clients.
OO programming languages whose don’t have
interfacekeyword, still have class interface OO concept.