There can be a abstract class without abstract methods, but
what is the need to declare a class abstract if it doesn't
contain abstract methods?
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Answer Posted / ram
We will get an additional facility in using abstract classes over interfaces is, in abstract class if we add a new method, in its child classes we need not implement those newly added methods as it is non-abstract method and has default implementation in the abstract class definition. But whereas if we add a new method (abstract) in the interface, in all its implemented classes needs to implement this newly added method which leads to many changes which is violating one of the design principle – Open for extension Closed for modification.
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