pure abstract class and interface [duplicate]

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To complete the former answers :

An interface is a “contract”. If a class implements an interface it have to propose all the services listed in the interface.

An abstract class is a skeleton. It defines a certain way its extended classes will work while letting them some free space (the abstract methods) to be unique.

A pure abstract class doing the same thing as a interface but have the problem of unique extending so, for me, it have no interest

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