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    JAVA設計模式-外觀模式

    外觀模式(Facade Pattern)隱藏系統的復雜性,并向客戶端提供了一個客戶端可以訪問系統的接口。這種類型的設計模式屬于結構型模式,它向現有的系統添加一個接口,來隱藏系統的復雜性。

    這種模式涉及到一個單一的類,該類提供了客戶端請求的簡化方法和對現有系統類方法的委托調用。

    介紹

    意圖:為子系統中的一組接口提供一個一致的界面,外觀模式定義了一個高層接口,這個接口使得這一子系統更加容易使用。

    主要解決:降低訪問復雜系統的內部子系統時的復雜度,簡化客戶端與之的接口。

    何時使用: 1、客戶端不需要知道系統內部的復雜聯系,整個系統只需提供一個"接待員"即可。 2、定義系統的入口。

    如何解決:客戶端不與系統耦合,外觀類與系統耦合。

    關鍵代碼:在客戶端和復雜系統之間再加一層,這一層將調用順序、依賴關系等處理好。

    應用實例: 1、去醫院看病,可能要去掛號、門診、劃價、取藥,讓患者或患者家屬覺得很復雜,如果有提供接待人員,只讓接待人員來處理,就很方便。 2、JAVA 的三層開發模式。

    優點: 1、減少系統相互依賴。 2、提高靈活性。 3、提高了安全性。

    缺點:不符合開閉原則,如果要改東西很麻煩,繼承重寫都不合適。

    使用場景: 1、為復雜的模塊或子系統提供外界訪問的模塊。 2、子系統相對獨立。 3、預防低水平人員帶來的風險。

    注意事項:在層次化結構中,可以使用外觀模式定義系統中每一層的入口。

    實現

    我們將創建一個 Shape 接口和實現了 Shape 接口的實體類。下一步是定義一個外觀類 ShapeMaker。

    ShapeMaker 類使用實體類來代表用戶對這些類的調用。FacadePatternDemo,我們的演示類使用 ShapeMaker 類來顯示結果。


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