6.1 Replace Constructors with Creation Methods - Refactoring to Patterns
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本文件讨论了用创建方法替代构造函数的动机及其优缺点，指出创建方法在命名、参数接受及维护上的灵活性。进一步提供了重构步骤，以替代构造函数并改善代码质量。文件还提到如何通过链式构造、统一接口和提取参数来优化构造函数的使用。
![Refactoring [F]
Extract Method [110]
Inline Method [117]
Move Method [142]
Introduce Parameter Object [295]](https://image.slidesharecdn.com/6-1replaceconstructorswithcreationmethodsrefactoringtopatterns-140821075408-phpapp01/85/6-1-Replace-Constructors-with-Creation-Methods-Refactoring-to-Patterns-6-320.jpg)
![Extract Method [110]](https://image.slidesharecdn.com/6-1replaceconstructorswithcreationmethodsrefactoringtopatterns-140821075408-phpapp01/85/6-1-Replace-Constructors-with-Creation-Methods-Refactoring-to-Patterns-7-320.jpg)
![Inline Method [117]](https://image.slidesharecdn.com/6-1replaceconstructorswithcreationmethodsrefactoringtopatterns-140821075408-phpapp01/85/6-1-Replace-Constructors-with-Creation-Methods-Refactoring-to-Patterns-8-320.jpg)
![Move Method [142]](https://image.slidesharecdn.com/6-1replaceconstructorswithcreationmethodsrefactoringtopatterns-140821075408-phpapp01/85/6-1-Replace-Constructors-with-Creation-Methods-Refactoring-to-Patterns-9-320.jpg)
![Introduce Parameter Object [295]](https://image.slidesharecdn.com/6-1replaceconstructorswithcreationmethodsrefactoringtopatterns-140821075408-phpapp01/85/6-1-Replace-Constructors-with-Creation-Methods-Refactoring-to-Patterns-10-320.jpg)
6.1 Replace Constructors with Creation Methods - Refactoring to Patterns
- 1. 6.1. Replace Constructors with Creation Methods 6. Creation(6.1) 11. Utilities YAO, LI-WEI 2014/08/14 Qlync Inc., RD Reading
- 5. Pros & Cons （+）比建構式（constructors）更能有效表達可獲得哪⼀一 種物件實體。︒ （+）突破建構式的限制，像是不能同時擁有兩個『引數 個數和引數型別均相同』的建構式。︒ （+）更容易找出未使⽤用的建構碼（creation code）。︒ （−）創建（creation）⽅方式變得不標準：有些classes使⽤用 new來具現化（instantiated），有些使⽤用Creation Method。︒
- 6. Refactoring [F] Extract Method [110] Inline Method [117] Move Method [142] Introduce Parameter Object [295]
- 10. Introduce Parameter Object [295]
- 11. Mechanics 1. Find out “cache-all” constructer “Ctor1" 1.1. Extract “Creation Method” 1.2. Move “Creation Method” 2. Replace “Ctor1” with “Creation Method” 3. “Inline Method”, if another constructer “Ctor2” called by “Ctor1” 4. Repeat 1~3 5. Visibility, private the “cache-all” constructer “Ctor1” if no external caller 11
- 12. Example in Book…
- 14. 11. Utilities 11.1. Chain Constructors 11.2. Unify Interfaces 11.3. Extract Parameter