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In our last episode, The Reader and The UML Guy refactored the simple Pizza Order Class into a more complex but more robust Class Diagram that supports a full range of pizza order options.

(Click picture for a larger image.)

Episode 7

No new references in this strip. Too much material to cover. But we see the return of some old friends.

Inheritance in UML is called "Generalization": Menu Item is a general Class, and Pizza, Item, Drink, and Side are more specific Classes. But in most common languages, it's just called "Inheritance". When I say "Generalization" in my UML classes, people look at me funny. Don't blame me, I didn't make up the names.

For a discussion of why type codes are for losers, I recommend (again) Fowler's Refactoring.


For an introduction to Patterns, I recommend Design Patterns: Elements of Reusable Object-Oriented Software...


...and also Head First Design Patterns.

Head First

Fowler's Party Pattern and a host of other really powerful Patterns are found in one of the most indispensable books on my shelf.

Analysis Patterns

With Design Patterns -- as powerful as they are -- there's a trick: you kinda have to know you need a particular Pattern to know whether you need that particular Pattern. They're low-level design concepts. Analysis Patterns are higher level, and you can usually recognize when you need them simply by looking at the customer's business problems.

Posted on Saturday, November 15, 2008 4:52 PM Ulterior Motive Lounge | Back to top

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