<complexType name="BookShelf">
<sequence>
<choice minOccurs="0" maxOccurs="unbounded">
<element name="newBook" type="string"/>
<element name="oldBook" type="string"/>
</choice>
</sequence>
</complexType>
JAXB生成属性作为List<JAXBElement<String>>.有没有什么方法可以生成ArrayList？