Home > Store

Design Patterns Explained: A New Perspective on Object-Oriented Design, 2nd Edition

Register your product to gain access to bonus material or receive a coupon.

Design Patterns Explained: A New Perspective on Object-Oriented Design, 2nd Edition

Best Value Purchase

Book + eBook Bundle

  • Your Price: $68.29
  • List Price: $117.98
  • Includes EPUB and PDF
  • About eBook Formats
  • This eBook includes the following formats, accessible from your Account page after purchase:

    ePub EPUB The open industry format known for its reflowable content and usability on supported mobile devices.

    Adobe Reader PDF The popular standard, used most often with the free Acrobat® Reader® software.

    This eBook requires no passwords or activation to read. We customize your eBook by discreetly watermarking it with your name, making it uniquely yours.

More Purchase Options


  • Your Price: $47.99
  • List Price: $59.99
  • Usually ships in 24 hours.

eBook (Watermarked)

  • Your Price: $46.39
  • List Price: $57.99
  • Includes EPUB and PDF
  • About eBook Formats
  • This eBook includes the following formats, accessible from your Account page after purchase:

    ePub EPUB The open industry format known for its reflowable content and usability on supported mobile devices.

    Adobe Reader PDF The popular standard, used most often with the free Acrobat® Reader® software.

    This eBook requires no passwords or activation to read. We customize your eBook by discreetly watermarking it with your name, making it uniquely yours.



A thoroughly-revised and timely second edition to one of the most successful introductory design patterns books on the market.

° Gain a pragmatic and conceptual understanding of design patterns and the fundamentals of object technology design

° Examples in both Java and C Sharp

° Part of the acclaimed Software Patterns Series from Addison-Wesley, the leading publisher of design patterns reference material


  • Copyright 2005
  • Dimensions: 7" x 9-1/4"
  • Pages: 480
  • Edition: 2nd
  • Book
  • ISBN-10: 0-321-24714-0
  • ISBN-13: 978-0-321-24714-8

"One of the great things about the book is the way the authors explain concepts very simply using analogies rather than programming examples–this has been very inspiring for a product I'm working on: an audio-only introduction to OOP and software development."

–Bruce Eckel

"...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."

–James Noble

Leverage the quality and productivity benefits of patterns–without the complexity! 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. 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. New and revamped coverage in this edition includes

  • Better ways to start "thinking in patterns"
  • How design patterns can facilitate agile development using eXtreme Programming and other methods
  • How to use commonality and variability analysis to design application architectures
  • The key role of testing into a patterns-driven development process
  • How to use factories to instantiate and manage objects more effectively
  • The Object-Pool Pattern–a new pattern not identified by the "Gang of Four"
  • New study/practice questions at the end of every chapter

Gentle yet thorough, this book assumes no patterns experience whatsoever. 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.

Sample Content

Online Sample Chapters

Design Patterns Explained: The Bridge Pattern

Design Patterns Explained: The Strategy Pattern

Understanding The Facade Pattern

Downloadable Sample Chapter

Download the Sample Chapter related to this title.

Table of Contents


1. The Object-Oriented Paradigm.


Before the Object-Oriented Paradigm: Functional Decomposition.

The Problem of Requirements.

Dealing with Changes: Using Functional Decomposition.

Dealing with Changing Requirements.

The Object-Oriented Paradigm.

Object-Oriented Programming in Action.

Special Object Methods.


Review Questions.

2. The UML-The Unified Modeling Language.


What Is the UML?

Why Use the UML?

The Class Diagram.

Interaction Diagrams.


Review Questions.


3. A Problem That Cries Out for Flexible Code.


Extracting Information from a CAD/CAM System.

Understand the Vocabulary.

Describe the Problem.

The Essential Challenges and Approaches.


Review Questions.

4. A Standard Object-Oriented Solution.


Solving with Special Cases.


Review Questions.


5. An Introduction to Design Patterns.


Design Patterns Arose from Architecture and Anthropology.

Moving from Architectural to Software Design Patterns.

Why Study Design Patterns?

Other Advantages of Studying Design Patterns.


Review Questions.

6. The Facade Pattern.


Introducing the Facade Pattern.

Learning the Facade Pattern.

Field Notes: The Facade Pattern.

Relating the Facade Pattern to the CAD/CAM Problem.


Review Questions.

7. The Adapter Pattern.


Introducing the Adapter Pattern.

Learning the Adapter Pattern.

Field Notes: The Adapter Pattern.

Relating the Adapter Pattern to the CAD/CAM Problem.


Review Questions.

8. Expanding Our Horizons.


Objects: The Traditional View and the New View.

Encapsulation: The Traditional View and the New View.

Find What Is Varying and Encapsulate It.

Commonality and Variability Analysis and Abstract Classes.

The Qualities of Agile Coding.


Review Questions.

9. The Strategy Pattern.


An Approach to Handling New Requirements.

The International E-Commerce System Case Study: Initial Requirements.

Handling New Requirements.

The Strategy Pattern.

Field Notes: Using the Strategy Pattern.


Review Questions.

10. The Bridge Pattern.


Introducing the Bridge Pattern.

Learning the Bridge Pattern: An Example.

An Observation About Using Design Patterns.

Learning the Bridge Pattern: Deriving It.

The Bridge Pattern in Retrospect.

Field Notes: Using the Bridge Pattern.


Review Questions.

11. The Abstract Factory Pattern.


Introducing the Abstract Factory Pattern.

Learning the Abstract Factory Pattern: An Example.

Learning the Abstract Factory Pattern: Implementing It.

Field Notes: The Abstract Factory Pattern.

Relating the Abstract Factory Pattern to the CAD/CAM Problem.


Review Questions.


12. How Do Experts Design?


Building by Adding Distinctions.


Review Questions.

13. Solving the CAD/CAM Problem with Patterns.


Review of the CAD/CAM Problem.

Thinking in Patterns.

Thinking in Patterns: Step 1.

Thinking in Patterns: Step 2a.

Thinking in Patterns: Step 2b.

Thinking in Patterns: Step 2c.

Thinking in Patterns: Steps 2a and 2b Repeated (Facade).

Thinking in Patterns: Steps 2a and 2b Repeated (Adapter).

Thinking in Patterns: Steps 2a and 2b Repeated (Abstract Factory).

Thinking in Patterns: Step 3.

Comparison with the Previous Solution.


Review Questions.


14. The Principles and Strategies of Design Patterns.


The Open-Closed Principle.

The Principle of Designing from Context.

The Principle of Encapsulating Variation.

Abstract Classes vs. Interfaces.

The Principle of Healthy Skepticism.


Review Questions.

15. Commonality and Variability Analysis.


Commonality and Variability Analysis and Application Design.

Solving the CAD/CAM Problem with CVA.


Review Questions.

16. The Analysis Matrix.


In the Real World: Variations.

The International E-Commerce System Case Study: Handling Variation.

Field Notes.


Review Questions.

17. The Decorator Pattern.


A Little More Detail.

The Decorator Pattern.

Applying the Decorator Pattern to the Case Study.

Another Example: Input/Output.

Field Notes: Using the Decorator Pattern.

The Essence of the Decorator Pattern.


Review Questions.


18. The Observer Pattern.


Categories of Patterns.

More Requirements for the International E-Commerce Case Study.

The Observer Pattern.

Applying the Observer to the Case Study.

Field Notes: Using the Observer Pattern.


Review Questions.

19. The Template Method Pattern.


More Requirements for the International E-Commerce Case Study.

The Template Method Pattern.

Applying the Template Method to the International E-Commerce Case Study.

Using the Template Method Pattern to Reduce Redundancy.

Field Notes: Using the Template Method Pattern.


Review Questions.


20. Lessons from Design Patterns: Factories.



The Universal Context Revisited.

Factories Follow Our Guidelines.

Limiting the Vectors of Change.

Another Way to Think About It.

Different Roles of Factories.

Field Notes.


Review Questions.


21. The Singleton Pattern and the Double-Checked Locking Pattern.

Introducing the Singleton Pattern.

Applying the Singleton Pattern to the Case Study.

A Variant: The Double-Checked Locking Pattern.


Field Notes: Using the Singleton and Double-Checked Locking Patterns.


Review Questions.

22. The Object Pool Pattern.


A Problem Requiring the Management of Objects.

The Object Pool Pattern.

Observation: Factories Can Do Much More Than Instantiation.


Review Questions.

23. The Factory Method Pattern.


More Requirements for the Case Study.

The Factory Method Pattern.

Factory Method Pattern and Object-Oriented Languages.

Field Notes: Using the Factory Method Pattern.


Review Questions.

24. Summary of Factories.


Steps in the Software Process.

Parallels in Factories and XP Practices.

Scaling Systems.


25. Design Patterns Reviewed: A Summation and a Beginning.


A Summary of Object-Oriented Principles.

How Design Patterns Encapsulate Implementations.

Commonality and Variability Analysis and Design Patterns.

Decomposing a Problem Domain into Responsibilities.

Patterns and Contextual Design.

Relationships Within a Pattern.

Design Patterns and Agile Coding Practices.

Field Notes.


Review Questions.

26. Bibliography.

Design Patterns Explained: The Web Site Companion.

Recommended Reading.

Recommended Reading for Java Programmers.

Recommended Reading for C++ Programmers.

Recommended Reading for COBOL Programmers.

Recommended Reading on eXtreme Programming.

Recommended Reading on General Programming.

Personal Favorites.



Download the Index file related to this title.


Submit Errata

More Information

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information

To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.


Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.


If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information

Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.


This site is not directed to children under the age of 13.


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020