工廠模式

簡單工廠模式

? 定義：由一個工廠決定創建出哪一個產品類的實例

? 優點：增加一個產品只需要對簡單工廠進行修改

類圖：

• 初始

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• 簡單工廠

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工廠模式

? 定義：將工廠進行抽象，解決簡單工廠只能單一工廠的問題

? 優點：工廠也可也創建多個

類圖：

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抽象工廠模式

? 定義：一個抽象工廠接口，多個工廠子類，外部聚合抽象工廠接口即可(所有屬性下沉到抽象工廠類)

類圖：

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應用

? JDK源碼：Calendar

總結

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