Abstract classes are essential to providing an abstraction to the code to make it reusable and extendable . For example, a Vehicle parent class with Truck and Motorbike inheriting from it is an abstraction that easily allows more vehicles to be added.
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Abstraction in Java Abstraction is a process of hiding the implementation details and showing only functionality to the user . Another way, it shows only essential things to the user and hides the internal details, for example, sending SMS where you type the text and send the message.
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