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Object Oriented Training - Session 3
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hatelove
July 04, 2012
Technology
1
11k
Object Oriented Training - Session 3
1. 高內聚、低耦合
2. 單一職責原則
3. 開放/封閉原則
hatelove
July 04, 2012
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Transcript
Trainer: Joey Chen Date: 2012/06/18 Object Oriented Training – Session
3
- 2 - 高內聚、低耦合
- 3 - 內聚
- 4 - 耦合
- 5 - 高內聚、低耦合
- 6 - 高內聚、低耦合
SOLID
Single Responsibility Principle (SRP) 單一職責原則
- 9 - 多職責
- 10 - 單一職責 • 3 layer • MVC
- 11 - 單一職責 • 避免一個class擁有多個職責 • 避免一個職責散落在多個class中
SOLID
Open Closed Principle (OCP) 開放封閉原則
- 14 - 對擴充開放,對修改封閉
- 15 - 開放封閉原則 • 判斷方式 – 當新增或修改需求時,可以新增class,而使用場景不需改變程 式,即符合開放封閉原則 –
當多一種新的可能時,在同一個class中(非工廠類別),使用if else來修改舊有邏輯,即違反開放封閉原則
- 16 - 案例 – 高內聚、低耦合
- 17 - 回顧
- 18 - 結論 • 抽象思考,釐清職責 • 新增class進行抽換,而不是修改、擴充舊的class • 好的Class特色
– 乾淨、清楚、簡單 – 容易組合與抽換
- 19 - 結論 • 高內聚、低耦合為設計目的 • 原則為設計精神 – 符合原則即可達到目的
• Design patterns – 針對不同需求 – 滿足這些原則的best practice – 達到高內聚、低耦合的目的
- 20 - 作業 – 重構 • 說明 – 決定便利商店的種類,未來可能不是從config讀取
– 資料來源可能會改變 – 未來可能會新增其他便利商店種類 • 注意 – 請將每個Class的職責說明,記錄於Class的summary document 上 – 請將職責獨立的Class,放到Library中,除非該Class是專屬於網 站的職責 – 請參考Selenium的Test Cases
- 21 -
Thanks for your listening Q & A