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Working Effectively with Legacy Code 1st Edition

4.5 4.5 out of 5 stars 648 ratings

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This book provides programmers with the ability to cost effectively handlecommon legacy code problems without having to go through the hugelyexpensive task of rewriting all existing code. It describes a series of practicalstrategies that developers can employ to bring their existing softwareapplications under control. The author provides useful guidance about how touse these strategies when refactoring or making functional changes to codebases. One of the book's key points is that it teaches developers to write teststhat can be used to make sure they are not unintentionally changing theapplication as they optimize it. Examples are provided in Java, C++, and Csharp,and the book assumes that the reader has some knowledge of UMLnotation. Strategies using UML and code in C++ and Java primarily whilelanguage independent advice will be delivered in side bars and appendices forlanguage specific users.

From the Back Cover

Get more out of your legacy systems: more performance, functionality, reliability, and manageability

Is your code easy to change? Can you get nearly instantaneous feedback when you do change it? Do you understand it? If the answer to any of these questions is no, you have legacy code, and it is draining time and money away from your development efforts.

In this book, Michael Feathers offers start-to-finish strategies for working more effectively with large, untested legacy code bases. This book draws on material Michael created for his renowned Object Mentor seminars: techniques Michael has used in mentoring to help hundreds of developers, technical managers, and testers bring their legacy systems under control.

The topics covered include

  • Understanding the mechanics of software change: adding features, fixing bugs, improving design, optimizing performance
  • Getting legacy code into a test harness
  • Writing tests that protect you against introducing new problems
  • Techniques that can be used with any language or platform―with examples in Java, C++, C, and C#
  • Accurately identifying where code changes need to be made
  • Coping with legacy systems that aren't object-oriented
  • Handling applications that don't seem to have any structure

This book also includes a catalog of twenty-four dependency-breaking techniques that help you work with program elements in isolation and make safer changes.


© Copyright Pearson Education. All rights reserved.

About the Author

MICHAEL C. FEATHERS works for Object Mentor, Inc., one of the world's top providers of mentoring, skill development, knowledge transfer, and leadership services in software development. He currently provides worldwide training and mentoring in Test-Driven Development (TDD), Refactoring, OO Design, Java, C#, C++, and Extreme Programming (XP). Michael is the original author of CppUnit, a C++ port of the JUnit testing framework, and FitCpp, a C++ port of the FIT integrated-testing framework. A member of ACM and IEEE, he has chaired CodeFest at three OOPSLA conferences.


© Copyright Pearson Education. All rights reserved.


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From the Publisher

Programmer holding Working with Legacy Code and a lap top

Must-Read for Every Programmer and Developer

This classic, endorsed by Robert "Uncle Bob" Martin (author of Clean Code), is on many must-read lists for programmers and developers including lists featured on Guru99, DZone, Built In, Dev Community (dev.to), and more.

"The book is important, as almost every developer at some point in career, has to work with a legacy system and it still represents the most challenging problems for many companies. The book goes deep into understanding the general process of a software change like adding features, fixing bugs, optimizing performances, etc."

—Milan Milanovic, DZone, November 2021

Product details

  • Publisher ‏ : ‎ Pearson; 1st edition (September 22, 2004)
  • Language ‏ : ‎ English
  • Paperback ‏ : ‎ 464 pages
  • ISBN-10 ‏ : ‎ 0131177052
  • ISBN-13 ‏ : ‎ 978-0131177055
  • Item Weight ‏ : ‎ 1.63 pounds
  • Dimensions ‏ : ‎ 7 x 1.2 x 9.25 inches
  • Customer Reviews:
    4.5 4.5 out of 5 stars 648 ratings

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Customer reviews

4.5 out of 5 stars
4.5 out of 5
648 global ratings
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1 Star
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The book is good so far, but don't get it here. Apparently this is an "Abridged" version, but I wouldn't even call it that. I've compared this physical copy with a PDF version and parts of sentences and sections are missing in a way that doesn't even make sense. Sentences at the bottom of a page are cut off without an ending, and an entirely new section starts on the next page. On one two page spread (shown in photos), a chart is duplicated, pushing the content down, and the rest of the content that is supposed to be on that page is just omitted entirely. The attached photos are of three pages from my physical copy with the issues I described, and the same three pages from a free PDF version of the book.
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Siddharth Kothari
5.0 out of 5 stars Very helpful book
Reviewed in India on July 31, 2023
María d.
5.0 out of 5 stars Great!!!
Reviewed in Mexico on November 23, 2020
liouba2505
5.0 out of 5 stars Le cadeau original pour un geek anglophone
Reviewed in France on January 9, 2022
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1.0 out of 5 stars This book is a reprinting of very low quality - beware!
Reviewed in Australia on January 12, 2024
Paolo Mazzoni
5.0 out of 5 stars Grande libro
Reviewed in Italy on September 9, 2017