class is used to define the general properties and behavior of the other classes. In other words abstract class is used to declare class attributes and methods used for the other classes.
- The abstract class does not allow initialization parameter, only declarations.
- The abstract class used as a superclass (base class) of the layers of the same nature. The essence here is to understand the kind, type, class mission.
- Each derived class (derived class - subclass) can inherit from an abstract class.
- Keywords abstract is used to define an abstract class wall.
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