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Refactoring: Improving the Design of Existing Code Don Roberts, John Brant, Kent Beck, Martin Fowler, William Opdyke
Publisher: Addison-Wesley Professional

This book is all about refactoring. Chapter 11 Dealing with Generalization（1）Pull Up FieldTwo subclasseshave the same field. Dating allllll the way back to 1999. Our job is to build effective software as rapidly as we can. Refactoring improving the design of existing code[ebook]. Refactoring: Improving the Design of Existing Code. In my short career I have seen entire systems who should have had a major refactoring. Beck, “Refactoring: improving the design of existing code”, Addison Wesley Longman, 1999, pp.238 – 240. Object oriented development was starting to come into it's own. Design Patterns by Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides. The concept of 'Code smells' was popularized by Kent Beck and Martin Fowler in the book 'Refactoring: Improving the Design of Existing Code' (ISBN 978-0201485677). Software developers are professionals. Now you can dramatically improve the design, performance, and manageability of object-oriented code without altering its interfaces or behavior. Refactoring: Improving the Design of Existing Code by Martin Fowler, Kent Beck, John Brant, William Opdyke and Don Roberts. My experience is that refactoring is a big ait to building software quickly. Move the field to the superclass.（2）Pull Up MethodYou have methodswith identical results on subcl.