Design Patterns Explained: A New Perspective on by Alan Shalloway

By Alan Shalloway

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In the UML, I can represent up to three things in a class: • The name of the class • The data members of the class • The methods (functions) of the class Figure 2 -1 The Class Diagram — its three variations. I have three different ways of showing these. •The leftmost rectangle shows just the class' name. I would use this type of class representation when more detailed information is not needed. 1. Gamma, Helm, Johnson, and Vlissides (the Gang of Four) call the first "aggrega tion" and the second "composition" — exactly the reverse of the UML.

Activity Diagrams, which focus on workflow of the problem domain (the actual space where people and other agents are working, the subject area of the program) rather than the logic flow of the program. Note: Since this book is principally focused on design, I will not cover Use Case Diagrams or Activity Diagrams here. Looking at object interactions Interaction Diagrams, which show how specific objects interact with each other. Since they deal with specific cases rather than general situations, they are helpful both when checking requirements and when checking designs.

Building expert systems involves two steps. First, acquire and model the set of rules that experts use to make decisions and accomplish the task. Second, implement this set of rules in the computer system; this step usually uses some sort of commercially available expert system tool. The first step is by far the more difficult assignment for the analyst. Understand the Vocabulary Terminology: classifying the shapes cut from the sheet metal The first task in analysis is to understand the vocabulary used by the users and the experts in the problem domain.

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