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Update CH09.md #10

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### 9.1.1 成員內部類別、區域內部類別

使用內部類別有幾個好處，其一是內部類別可以直接存取其所在類別中的私用（private）成員；其二是當某個 Slav e類別完全只服務於一個 Master 類別時，您可以將之設定為內部類別，如此使用 Master 類別的人就不用知道 Slave 的存在；再者是像在「靜態工廠」（Static factory）模式中，對呼叫靜態方法的物件隱藏返回物件的實作細節或產生方式。
使用內部類別有幾個好處，其一是內部類別可以直接存取其所在類別中的私用（private）成員；其二是當某個 Slave類別完全只服務於一個 Master 類別時，您可以將之設定為內部類別，如此使用 Master 類別的人就不用知道 Slave 的存在；再者是像在「靜態工廠」（Static factory）模式中，對呼叫靜態方法的物件隱藏返回物件的實作細節或產生方式。

先來介紹成員內部類別，基本上是在一個類別中直接宣告另一個類別，例如：

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