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In programming languages, an abstract class is a generic class (or type of object) used as a basis for creating specific objects that conform to its protocol, or the set of operations it supports. Abstract classes are not instantiated directly.

Abstract classes are useful when creating hierarchies of classes that model reality because they make it possible to specify an invariant level of functionality in some methods, but leave the implementation of other methods until a specific implementation of that class (a derived class) is needed.

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please tell about overloading and overriding?

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