P.7. Wrap-Up
In this appendix, we have introduced the importance, usefulness and prevalence of design patterns. In their book Design Patterns, Elements of Reusable Object-Oriented Software, the “Gang of Four” described 23 design patterns that provide proven strategies for building systems. Each pattern belongs to one of three pattern categories—creational patterns address issues related to object creation; structural patterns provide ways to organize classes and objects in a system; and behavioral patterns offer strategies for modeling how objects collaborate with one another in a system.
Of the 23 design patterns, we discussed 18 of the more popular ones used by the Java community. The discussion was divided according to how certain packages ...
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