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                ## 2.5 自定義虛擬屬性 可以為特定類注冊一個虛擬屬性,也可以為一些類注冊虛擬屬性 - public void registerVirtualAttributeClass(Class cls, VirtualClassAttribute virtual) 實現VirtualClassAttribute方法可以為特定類注冊一個需要屬性,如下代碼: ```java gt.registerVirtualAttributeClass(User.class, new VirtualClassAttribute() { @Override public String eval(Object o, String attributeName, Context ctx){ User user = (User) o; if(attributeName.equals("ageDescritpion")){ if (user.getAge() < 10){ return "young"; }else{ return "old"; } } } }); ``` User類的所有虛擬屬性將執行eval方法,此方法根據年紀屬性來輸出對應的描述。 - public void registerVirtualAttributeEval(VirtualAttributeEval e) 為一些類注冊需要屬性,VirtualAttributeEval.isSupport方法將判斷是否應用虛擬屬性到此類 如下是虛擬屬性類的定義 ```java public interface VirtualClassAttribute{ public Object eval(Object o, String attributeName, Context ctx); } public interface VirtualAttributeEval extends VirtualClassAttribute{ public boolean isSupport(Class c, String attributeName); } ```
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