Question

What is an abstract class?​

Answer 1

Answer:

• A class having an abstract keyword is called an abstract class.

Answer 2

Answer:

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In programming languages, an abstract type is a type in a nomiñative type system that cannot be insťantiated directly; a type that is not abstract – which can be instántiated – is called a concrete type. Every insťance of an abstract type is an insťance of some concrete subtype.