This book aims to teach us how to reuse design patterns that have been used over and over again. While this book does not cover all patterns in detail, it covers the patterns that are commonly used according to the authors' mind. In overall, this is the book you want to buy as a starting point to learn design patterns.
To begin with, before reading this book, you have to know about Java programming language along with the object-oriented features such as encapsulation, inheritance, and polymorphism. Bear in mind that by having solid object-oriented knowledge does not make you a good object-oriented designer. I thought the opposite until I read this book. For those who do not know the language and/or the object oriented feature, they should study them first before attempting to read this book.
When reading this book, please note that the primary intention of this book is to teach you about design patterns. Therefore, if you find the examples are not what you expected (too simple, childish, imaginary, and so on), you need to know that the examples are made as simple as possible so you can concentrate on learning design patterns. Unfortunately, some people just do not understand this approach. They probably want examples that have hundreds line of code to explain each patterns and I am very sure if this was the case, they would give bad review anyway by arguing that the examples are too complex.
The only negative thing is the fact that not all 23 patterns are covered. I wish all of them were covered in a single book and even if the price were twice as much I would certainly buy it. I do not know why the authors did so. They covered only around 13 and cramp the others in 20 pages in the appendix.
In my personal experience, after reading this book, it changed my paradigm toward object-oriented design and made me ask myself, "Why I didn't buy this book earlier?" Had I bought it earlier, my campus projects would have gone easier. In addition, ever since I read this book, I often think about the pattern(s) that can be applied in the other programming books' code example, especially when the examples have too many if and if else statements as they could be refactored using state pattern or command pattern. The reason some programming books do not bother with design patterns (even though the authors probably know about it) is because not their focus in their books. That is why this book is useful. Also, please be aware that in this book source code, the instance variables are not declared private. In reality you have to make it private according to the principle of the least privilege.
Finally, I highly recommend this book to anyone who already knows Java and its object-oriented features as it helps you to learn commonly used patterns and to design better using best design principles (open closed principle, encapsulate what varies, etc).
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From the Publisher
What you’ll find in Head First Design Patterns, 2014:
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The core design principles and design patterns—everything you need to take your programming skills to the next level. |
The same great visual explanations and brain-friendly learning style you’re used to from Head First, with exercises and challenges so the design patterns really sink in. |
Updated code! The code for all the examples and exercises now compiles and runs with Java 8. |
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Top reviews from other countries
Yossu
Brilliant - but why is it so Java-oriented?
Reviewed in the United Kingdom on November 24, 2010Fergus
Good introduction, a bit bloated though..
Reviewed in the United Kingdom on August 30, 2012EinKunde
Eine Alternative zu trockenen Pattern-Katalogen
Reviewed in Germany on April 14, 2011Client d'Amazon
Bon livre à condition de bien maîtriser l'anglais
Reviewed in France on April 25, 2020
