Methods do not provide the intuiton and the direct access to solutions that work in real life. Design Patterns are the jewels, the cristals of Object Oriented Design ...

slide: Phrases ..

Take for example a document processing system ...

slide: Document processing

Managing composites

Problem: very many items

Solution: flyweight class

slide: Composite ...
slide: Composite

Managing layout and formatting

Problem: many algorithms

Solution: composer (strategy) class
slide: Strategy ...
slide: Strategy

Display item with attributes

Problem: non-uniform attributes

Solution: embed and hide attributes
slide: Decorate ...
slide: Decorator

Develop multi-platform tools (1)

Problem: different window toolkits

Solution: employ platform-specific factories
slide: Factory ...
slide: Factory

Develop multi-platform tools (2)

Problem: offer uniform widget hierarchy

Solution: separate interface from implementation
slide: Bridge ...
slide: Bridge

Provide rich functionality

Problem: support commands with undo

Solution: abstract from specific commands

slide: Command ...
slide: Command

Observer

one-to-many dependencies and notification

Consequences

slide: Observer Pattern

Implementation

slide: Observer Pattern