I would expect that readers with a basic understanding of object-oriented programming and design w I would expect that readers with a basic understanding of object-oriented programming and design would find this book useful, before approaching design patterns completely. Design Patterns Explained complements the existing design patterns texts and may perform a very useful role, fitting between introductory texts such as UML Distilled and the more advanced patterns books.
Design Patterns Explained, Second Edition is the field's simplest, clearest, most practical introduction to patterns.
Using dozens of updated Java examples, it shows programmers and architects exactly how to use patterns to design, develop, and deliver software far more effectively. You'll start with a complete overview of the fundamental principles of patterns, and the role of object-oriented analysis and design in contemporary software development.
Getting to Know Design Patterns
Then, using easy-to-understand sample code, Alan Shalloway and James Trott illuminate dozens of today's most useful patterns: their underlying concepts, advantages, tradeoffs, implementation techniques, and pitfalls to avoid. Many patterns are accompanied by UML diagrams. Building on their best-selling First Edition, Shalloway and Trott have thoroughly updated this book to reflect new software design trends, patterns, and implementation techniques.
Reflecting extensive reader feedback, they have deepened and clarified coverage throughout, and reorganized content for even greater ease of understanding.
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It's the ideal "first book" on patterns, and a perfect complement to Gamma's classic Design Patterns. If you're a programmer or architect who wants the clearest possible understanding of design patterns--or if you've struggled to make them work for you--read this book. I think this book deserves a six star remark!
Functional decomposition: a natural way to deal with complexity; Break down the problem into functional steps. Use modularity to contain variation; Modularity can't solve the problems such as low cohesion and tight coupling.
Coupling refers to the strength of a connection between two routines Coupling is a complement to cohesion. Cohesion describes how strongly the internal contents of a routine are related to each other; Coupling describes how strongly a routine is related to other routines; The goal is to create routines with strong cohesion and low coupling; 2.
Objects are things defined with their own proper responsibilities; 3. A class is a definition of the behavior of an object. Abstract classes define what a set of classes can do.
Then the concrete classes inherit the common behaviors from them. Abstract classes act as placeholders.
Abstract classes are more than classes that don't get instantiated. Only in the implementation level this proposition is correct; 5.
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Encapsulation means all kinds of hiding; 6. Perspectives: conceptual, specification and implementation; 7.
Attribute: data associated with an object also called a data member ; 8. The adapter pattern: An object in the structure wraps an existing object, to make the latter adapt; Using the adapter pattern allows us to continue using polymorphism; The adapter provides a wrapper with the desired interface.
It allows for preexisting objects to fit into new class structures without being limited by their interfaces; 9. A facade pattern simplifies an interface while an adapter converts the interface into a preexisting interface; Find what varies and encapsulate it.
Favor composition over inheritance; Both the commonality and variability are involved in the specification perspective; Bridge pattern decouples an abstraction from its implementation so that the two can vary independently; Decorator pattern attaches additional responsibilities to an object dynamically; The singleton pattern and the double-checked locking pattern are used to ensure that only one object of a particular class is instantiated; Singleton: for single threaded; Double-checked locking: for multi-threaded; The observer pattern is a decoupling behavioral pattern;.
Working Effectively with Legacy Co Pattern-Oriented Software Architect Refactoring Pattern-Oriented Software Architect The Design and Implementation of Engineering a Compiler, Second E Cohesion describes how strongly the internal contents of a rou