Answer :
An Abstract method must be overridden in order to ever become Concrete. A method cannot be overridden once it has been declared final.
Why is Java using abstract methods?
Abstraction in a programming language refers to the process of hiding non-essential information from the user in order to maximize efficiency while minimizing complexity. Java uses abstract and methods to implement abstraction.
Why would we declare a method that is abstract?
An abstract method is one that has no definition (implementation) and is defined using the abstraction keyword inside an abstract class. The methods can be declared as abstracts when we just need the function definition in a super class.
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