Why Abstract Class ?

Sometimes there may be a need to crate a super class that only defines a generalized form that will be shared by all of its sub classes , leaving it to each sub class to fill in the details . Such a class determines the mature of the methods that the sub classes must implement. Abstract class provides a way to solve this type of situation.

Restrictions of abstract class :-

* Constructor never be declared as abstract .

* An object can't be created of abstract class since an abstract  class is not fully defined .

* Can't declare an abstract static methods .