我們知道同為apple旗艦產品的iPhone和ipod其實差不太多，只是iPhone的配置相對高一些，同時多了通訊模塊。那麽上面的代碼是否顯得臃腫，沒有設計，因為都是在創建對象的時候去設置其屬性，而且這兩款產品的屬性似乎差不多，好像可以套用一樣的生產線。

建造者模式 = buildX() + construct() + (optional)ifX()

第一次建造

增加一個基類Apple產品類，包含並集的所有零件的屬性。

public class Apple {
    private String camera;
    private String touchScreen;
    private String communication;
    //省略getter，setter方法。
 

增加一個abstract AppleBuilder類，包含Apple的成員對象。然後加入buildX方法，以及鉤子方法ifX用來判斷某些只有一些子類特有的屬性。最後要加一個成員對象apple的獲取方法。

註意：這個apple對象要定義為protected的原因是它的子類要直接使用這個對象。

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http://pic.cnhubei.com/space.php?uid=3049&do=album&id=558399

由於默認ifCommunication是false，