本书提炼和反映了全球模式、重构和敏捷开发社区60多位软件工程领域先驱的思想和观点，介绍了以模式为导向的重构方法的理论和实践。通过使用实际项目的代码，本书记录了潜藏在20多个基于模式的设计转换之下的思想方法和设计步骤。同时，本书对于模式差异以及如何以尽可能简单的方式实现模式提出了颇有见解的观点。不管你正在集中精力进行遗留开发还是新型开发，本书都将帮助你学会如何安全、有效地做出重要的设计变更，使你成为更好的软件设计人员。

Foreword by Ralph Johnson 

Foreword by Martin Fowler 

Preface 

  What Is This Book About? 

  What Are the Goals of This Book? 

  Who Shou|d Read This Book? 

  What Background Do You Need? 

  How to Use This Book

  The History of This Book 

  Standing on the Shoulders of Giants 

  Acknowledgments 

Chapter 1: Why I Wrote This Book

  Over-Engineering

  The Patterns Panacea

  Under-Engineering

  Test-Driven Development and Continuous Refactoring

   Refactoring and Patterns

   Evolutionary Design 

Chapter 2: Refactoring

   What Is Refactoring?

   What Motivates Us to Refactor?

   Many Eyes 

   Human-Readable Code

  Keeping It Clean 

  Small Steps

  Design Debt

  Evolving a New Architecture

  Composite and Test-Driven Refactorings

  The Benefits of Composite Refactorings

  Refactoring Tools

Chapter 3: Patterns

……