What Does an Object Design Look

Types

Show the object types, e.g., we show five object types here.

Shape
Circle
Rectangle
Ellipse
Turtle

Hierarchies

Show the object type Hierarchies, e.g., super-type "Shape" with three sub-types.

                Shape
                  |
  ----------------+----------------
  |               |               |
Circle        Rectangle        Ellipse

Sub-Components (Instance Variables)

Show sub-components (ivars), e.g., sub-component "shape" on a "Turtle" object.

Turtle
  |
shape
  |
  +---- aShape

What Does an Object Design Look Like?

Key pieces (deliverables) of an object design:

Show the designed object types -- e.g. maybe "Circle", "Rectangle", "Fractal", "Shape", "Customer"
Show the type hierarchy -- e.g. maybe sub-types "Circle" and "Rectangle" that inherit from a super-type "Shape"
For each object type, show the sub-components (ivars) on the given object type -- e.g., maybe a "Customer" has a sub-component named "mailingAddress" of type "MailingAddress"
For each object type, show the methods that the type owns (method names are sufficient) -- e.g., maybe type "Rectangle" has methods "getWidth", "getHeight" and "computeArea"

Object Oriented Programming (Chapter 301 - Normalizing (Simplifying) an Object Design)

Chapter 301 - Normalizing (Simplifying) an Object Design What Does an Object Design Look Like?

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