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Actually there is no need & most importantly - you cannot create an abstract class without using the abstract keyword
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Abstraction in Java is achieved using interfaces and abstract class. abstract means something which is not complete or concrete but abstraction itself is a great programming concept and allow you to write code which is more flexible to change.
The abstract keyword signifies that the particular method will have no features in the class where it is declared and it is upto the child class to provide the functionality. In case of an interface, the method is already abstract by default and has no code inside it. So there is no actual point in using the abstract keyword there.