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Abstract Classes Overview
Abstract classes may or may not have implementation for specific methods. The idea is to provide partial implementation to child classes.
If a class implements an interface but doesn't provide implementation for all methods, then that class must be declared as abstract.
Interfaces Vs. Abstract Classes
Following are the significant differences:
- An interface cannot implement any methods, whereas an abstract class can.
- A class can implement many interfaces but can have only one superclass.
- An interface is not part of the class hierarchy. Unrelated classes can implement the same interface.