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Sarcar - Java design patterns A hands-On experience with real-world examples

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Sarcar Java design patterns A hands-On experience with real-world examples
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Get hands-on experience implementing 26 of the most common design patterns using Java and Eclipse. In addition to Gang of Four (GoF) design patterns, you will also learn about alternative design patterns, and understand the criticisms of design patterns with an overview of anti-patterns. For each pattern you will see at least one real-world scenario, a computer-world example, and a complete implementation including output.
This book has three parts. The first part covers 23 Gang of Four (GoF) design patterns. The second part includes three alternative design patterns. The third part presents criticisms of design patterns with an overview of anti-patterns. You will work through easy-to-follow examples to understand the concepts in depth and you will have a collection of programs to port over to your own projects.
A Q&A session is included in each chapter and covers the pros and cons of each pattern. The last chapter presents FAQs about the design patterns. The step-by-step approach of the book helps you apply your skills to learn other patterns on your own, and to be familiar with the latest version of Java and Eclipse.


What Youll Learn
Work with each of the design patterns
Implement design patterns in real-world applications
Choose from alternative design patterns by comparing their pros and cons
Use the Eclipse IDE to write code and generate output
Read the in-depth Q&A session in each chapter with pros and cons for each design pattern
Who This Book Is For
Software developers, architects, and programmers

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Vaskaran Sarcar Java Design Patterns A Hands-On Experience with Real-World - photo 1
Vaskaran Sarcar
Java Design Patterns A Hands-On Experience with Real-World Examples 2nd ed.
Foreword by Sunil Sati
Vaskaran Sarcar Bangalore Karnataka India Any source code or other - photo 2
Vaskaran Sarcar
Bangalore, Karnataka, India

Any source code or other supplementary material referenced by the author in this book is available to readers on GitHub via the books product page, located at www.apress.com/978-1-4842-4077-9 . For more detailed information, please visit http://www.apress.com/source-code .

ISBN 978-1-4842-4077-9 e-ISBN 978-1-4842-4078-6
https://doi.org/10.1007/978-1-4842-4078-6
Library of Congress Control Number: 2018964945
Vaskaran Sarcar 2019
Standard Apress
Trademarked names, logos, and images may appear in this book. Rather than use a trademark symbol with every occurrence of a trademarked name, logo, or image we use the names, logos, and images only in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the trademark. The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights.
While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein.
Distributed to the book trade worldwide by Springer Science+Business Media New York, 233 Spring Street, 6th Floor, New York, NY 10013. Phone 1-800-SPRINGER, fax (201) 348-4505, e-mail orders-ny@springer-sbm.com, or visit www.springeronline.com. Apress Media, LLC is a California LLC and the sole member (owner) is Springer Science + Business Media Finance Inc (SSBM Finance Inc). SSBM Finance Inc is a Delaware corporation.

This book is dedicated to Almighty God, my family, and the Gang of Four.

You are my inspiration.

Foreword

A problem well stated is a problem half solved.

Charles Kettering, inventor and engineer

To build on this concept, I must say that thinking about all possible scenarios and coming out with a best possible option is the key to a robust and lasting solution. This new second edition of Java Design Patterns will serve as a mentor and guide to engineers and designers who are regularly challenged to come up with the best possible solution in resource-constrained environments. This book explains in very clear terms the design patterns, the alternatives, and the concept of antipatterns. The complete section on antipatterns is very thought-provoking and helps us appreciate the utility of design in the first place.

As in his previous books, Vaskaran has provided hands-on experience in implementing design patterns. His innate way of getting engineers to think of an alternative solution is very insightful. This book will serve as mentor and task master as one traverses the chapters.

When I reflect on my interactions with Vaskaran while facing some complex engineering issues in HPI, I find him to be a keen listener, deep thinker, and a person who doesnt rush for a solution. After analyzing all possible alternatives, he picks the best one among the lot. In summary, this is what this book all about.

Sunil Sati

Senior Project Manager, BU Automotive Division, NXP Semiconductors

About Sunil Sati

Sunil Sati is an engineer with a major in electronics and communication from NIIT Surathkal and EGMP from IIM-Bangalore. He has 23 years of experience in various roles and capacities in process automation and semiconductor industries. Currently, he is working as senior manager with NXP Semiconductors in the automotive division. He was the brand ambassador in HPI for the Print Renaissance program. He loves to work and build teams across geographic locations.

Introduction

Welcome to your journey through Design Patterns in C# .

This is an introductory guide to the design patterns that you want to use in Java. You probably know that the concept of design patterns became extremely popular with the Gang of Fours famous book Design Patterns: Elements of Reusable Object-Oriented Software (Addison-Wesley, 1994). Most important, these concepts still apply in todays programming world. The book came out at the end of 1994, and it primarily focused on C++.

But Sun Microsystems released its first public implementation Java 1.0 in 1995. So, in 1995, Java was totally new to the programming world. But it grew rapidly, becoming rich with features. It has now secured its rank in worlds top programming languages. In todays programming world, it is always in high demand. On the other hand, the concepts of design patterns are universal. So, when you exercise these fundamental concepts of design patterns with Java, you will be a better programmer and youll open new opportunities for yourself.

In 2015, I wrote Design Patterns in C#: Computer Science Interview Series , and in 2016, I wrote Java Design Pattern: A tour with 23 Gang of Four Design Patterns in Java . They are basically the companions to this book.

In those books, my core intention was to implement each of the 23 Gang of Four (GoF) design patterns with C# and Java implementations. I wanted to present each pattern with simple examples. One thing was always on my mind when writing Java Design Patterns (First Edition): I wanted to use the most basic constructs of Java, so that the code would be compatible with both the upcoming version and the legacy version of Java. I have found this method helpful in the world of programming.

In the last two years, I got a lot of constructive feedback from my readers. This fully revised and updated version is created keeping those feedback in mind. I also took the opportunity to update the formatting and correct some typos in the previous version of the book and add new content to this new edition.

This time, I wanted to focus on another important area; I call it the doubt-clearing sessions. I knew that if I could add some more information such as alternative ways to write these implementations, the pros and cons of these patterns, when to choose one approach over another, and so on, readers would find this book even more helpful. So, in this enhanced version of the original, I have added a Q&A Session section to each chapter that can help you learn about each pattern in more depth.

In the world of programming, there is no shortage of patterns, and each has its own significance. So, in addition to the 23 GoF design patterns covered in Part I, I discuss three design patterns that are equally important in todays world of programming in Part II. Finally, in Part III, I discuss the criticism of design patterns and give you an overview of antipatterns, which are also important when you implement the concepts of design patterns in your applications.

Before jumping into these topics, I want to highlight few more points.
  • You are an intelligent person. You have chosen a subject that can assist you throughout your career. If you are a developer/programmer, you need these concepts. If you are an architect at a software organization, you need these concepts. If you are a college student, you need these concepts, not only to score high on exams but to enter the corporate world. Even if you are a tester who needs to take care of white-box testing or needs to know about the code paths of a product, these concepts will help you a lot.

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