本书清晰揭示了重构的过程，解释了重构的原理和最佳实践方式，并给出了何时以及何地应该开始挖掘代码以求改善。书中给出了70多个可行的重构，每个重构都介绍了一种经过验证的代码变换手法的动机和技术。(This book clearly reveals the process of refactoring, explains the principles of refactoring and best practices, and gives the time and where to begin to code to improve. The book gives more than 70 viable refactorings, each of which introduces the motivations and techniques of a proven code transformation technique.)