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Can a class extend abstract class or interface? why
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Answer Posted / abhay bhatia
a class can extend an abstract class and can implement an
interface, why is because even though an abstract class
provide default implementation of its methods, we cannot
instantiate an object of the abstract class and therefore
need a class that extends it to use the instance methods of
this abstract class. An interface on the other hand cannot
even have default implementation, therefore it has to be
implemented to be used
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