What is abstraction?
Abstraction is process of hiding the implementation details and showing only the functionality.
In object oriented programming Data Abstraction is used through using abstract keyword.
Abstraction in java is achieved by using interface and abstract class. Interface give 100% abstraction and abstract class give 0-100% abstraction.
An abstract class is something which is incomplete and you cannot create instance of abstract class.
If you want to use it you need to make it complete or concrete by extending it.
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