1. Features of OOP Abstraction Encapsulation Data Hiding Inheritance
Polymorphism
Code Reuse

2. Abstraction and Encapsulation
Abstract Data Type
Data and Operations on the data
Encapsulation
Class
Data members
Methods (Property, Sub, Function)

3. Abstraction and Encapsulation
FormClassList
Display Button
_MainForm.DisplayOneHouse(h)
FormClassHouse
Public Sub DisplayOneHouse(ByVal h As House)

4. Data Hiding Private data members Public Property, Sub, Function
Checking parameters and raising Exceptions
FormClassHouse/FormClassList
Call methods
Try and Catch

5. Inheritance Base class and Sub classes Visual (Form) Inheritance House
Chicago, Madison, Platteville
Visual (Form) Inheritance
FormClassHouse
Protected btnExit
btnExit: EXIT
FormClassBranch
btnExit.Text: UNLOAD

6. Polymorphism FormClassHouse
The class cannot have variables of any House sub-classes
FormClassList