Lecture Notes on 23 Jan 2023

* Principles of Object Oriented Programming
  - Abstraction - extract the attributes and behaviors of a
                  real world object to represent in software
  - Encapsulation - put attributes and functionalities together
                    to form a class
    - information hiding - make attributes private and methods
                           public
  - Inheritance - test by using the phrase "is-a(n)"
  - Polymorphism - many forms

* Difference between "is-a" (inheritance) and "has-a" (composition)

* Inheritance achieved through polymorphism