1. Chapter 20 Object-Oriented Concepts and Principles

2. The OO Process Model

3. The OO Mindset
objects
problem domain

4. Classes
object-oriented thinking begins with the definition of a class often defined as:
template
generalized description
pattern
“blueprint” ... describing a collection of similar items
a metaclass (also called a superclass) is a collection of classes
once a class of items is defined, a specific instance of the class can be defined

5. Building a Class

6. Encapsulation/Hiding
The object encapsulates
both data and the logical
procedures required to
manipulate the data
method
# 1
method
# 2
data
method
# 6
method
# 5
method
# 4
Achieves “information hiding”

7. What is a Class? occurrences roles organizational units things places
external entities
structures
class name
attributes:
operations:

8. Class Hierarchy furniture (superclass) table chair desk "chable"
subclasses of the
furniture superclass
instances of chair

9. Methods (a.k.a. Operations, Services)
An executable procedure that is encapsulated in a class and is designed to operate on one or more data attributes that are defined as part of the class.
A method is invoked
via message passing.

10. Messages

11. Key Concepts classes and class hierarchies instances inheritance
abstraction and hiding
objects
attributes
methods
encapsulation
polymorphism
messages

12. Other Recursive/parallel model OO Project metrics and estimation
Like spiral/evolutionary
But differs 2 ways
OO Project metrics and estimation
OO Project tracking