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                ### 擦拭法 Java的泛型(Generic)是采用擦拭法(Type Erasure)實現的。 ![](http://blog.liufei1988.com/a826e9732c1b0156938e793b4598d63d) 擦拭法的局限: * <T>不能是基本類型,例如int * Object字段無法持有基本類型 * 無法取得帶泛型的Class * 無法判斷帶泛型的Class * 不能實例化 T 類型 ![](http://blog.liufei1988.com/0690c97578c47efcbec4cd46cb17f7cf) 可以繼承自泛型類: ``` public class IntPair extends Pair<Integer> { } ``` 子類可以獲取父類的泛型類型。 繼承關系: ``` Type | +- Class | +- ParameterizedType | +- GenericArrayType | +- WildcardType ```
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