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What we can have in Abstract Classes ?

An Abstract Class can have without or with one or more Abstract Methods, have Concrete Methods (method with body implementation) and instance variables.

- We should declare Abstract Methods and Abstract Classes with the keyword abstract.
Unique classes can't make instantiated, Anyhow they camwood a chance to be subclassed. The point when an conceptual class will be subclassed, the subclass as a rule gives usage for constantly on of the theoretical routines for its guardian population. However, whether it does not, that point the subclass must Additionally make announced conceptual.