Abstract classes and Interfaces

Abstract classes often have abstract methods

If a class inherits an abstract class, all abstract methods in the abstract class must be implemented

The methods in the interface must all be abstract methods

If a non-abstract class implements an interface, all the methods in the interface must be implemented

Abstract class is a description of the generality of a thing.

An interface is an abstraction of a behavior

All elephants drink water, inherit elephants, drink water, and drink water for lions.

Abstract classes and Interfaces