Appendix D. Key Refactorings
These UML diagrams are before-and-after representations for some important refactorings. See Fowler et al., Refactoring: Improving the Design of Existing Code, for a full catalog of transformations and the steps that will let you safely apply them.
Change Bidirectional Association to Unidirectional
Duplicate Observed Data
Extract Class
Extract Method
Move Field
Move Method
Replace Type Code with State/Strategy
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