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This book contains a patterns catalog which is

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a number of design patterns classified by purpose. And

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there are five main classes of patterns. There are

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fundamental patterns which are the basic patterns. There are

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creational patterns which are the patterns that support object

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creation. Then there are structural patterns and these are

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patterns that help compose objects, put objects together. The

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next class of patterns are behavioral patterns and these

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are patterns that are mostly focused on realizing interactions

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among different objects. Finally, there are concurrency patterns and these

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are patterns that support, as the name says, concurrency, so

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they're more related to concurrency aspects. And for each of

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these classes there are a number of specific patterns, and

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here I'm just listing some of them. Clearly we cannot

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cover in one lesson all of these patterns, but what

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I want to do is to cover at least a few

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of those to give an idea of what patterns are and

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how they can be used. In particular, we will see in

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detail the Factory Method Pattern and the Strategy Pattern. And we

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will also discuss a few more patterns at a higher level.