單一職責原則
就一個類別而言，應該僅有一個引起它變化的原因。
定義：Each class in your system should have only one responsibility.
[閱讀筆記][Design Pattern] Ch3. 單一職責原則(Single Responsibility Principle)
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就一個類別而言，應該僅有一個引起它變化的原因。
定義：Each class in your system should have only one responsibility.
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