CSCE 315 Lecture 26

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Design Patterns

Finally!

Based on architectural patterns of problems that have been solved before.

Design Patterns: Elements of Object-Oriented Software by the Gang of Four (have it)

Organization

Purposes: Creational, Structural, Behavioral (GoF organization)

Examples

Factory Method

Use a method that can be overridden to create an object of a certain class

Adapter

Create an intermediate interface that clients expect to work with another interface

Composite

Tree structure in which all nodes extend from a base node

Iterator

Access an aggregate object in an easy-to-use order

Observer

one-to-many dependency between abjects so that when data changes, dependant objects are notified and updated automatically