1. Object-Oriented Programming
Also known as OOP
Based upon the classification model used by people
Things are objects that belong to classes
Related objects can share attributes (properties) and behavior
Tables and desks belong to a class of furniture
They share common attributes in that both generally have 4 legs and a large, flat surface on top
True OOP languages support
Encapsulation
Polymorphism
Inheritance VB
Object-based since it does not support inheritance
Regardless, many OOP concepts can still be applied

2. Classes without Inheritance
What do we do if we now provide our employees with ?
We need to add that to both classes

3. Classes with Inheritance
What do we do if we now provide our employees with ?
We add to the base class & manager and laborer inherit that attribute

4. Classes with Multiple Levels of Inheritance

5. Defining User Objects Add a Class to a Project
Add Properties to a Class
Create Objects using Instances of a Class
Object References
Class Events
Initialize Event
Terminate Event
Add Methods

6. Adding a Class to a Project
Add a Class module (different from a module that we used for global declarations and procedures)

7. Collections vs Arrays A list of objects An array of objects
Allows objects to be added at any position
Allow objects to be deleted from the middle
Objects may be retrieved using a key value
more power, more flexible, less efficient
An array of objects
New objects added to end of array
No easy way to allow removal of objects
Search code is required to retrieve objects
less power, less flexible, more efficient
Collections result in simpler, easier-to-read, easier-to-maintain code than object arrays

8. Collections Processing
Create a Collection
Retrieve an Object Reference from a Collection
Iterate through a Collection
Delete an Object Reference from a Collection
Delete a Collection