java - 将已转换的对象返回到具体类类型

Question

请看下面的方法。 有没有办法以通用的方式强制转换创建的对象，并将已强制转换的对象返回到具体的类类型，这样用户就不必自己强制转换它？

public static  Object getObject(String xmlString, String fullyQualifiedClassName) throws Exception {

        StringReader reader = new StringReader(xmlString);
        UploadDocument doc = (UploadDocument) unmarshaller.unmarshal(reader);

        Class<?> clazz = (Class<?>) Class.forName(fullyQualifiedClassName);

        UploadResult result = DataUploaderUtil.createObject(doc);

        if (result != null) {
              Object uploadObject = result.getUploadObject();
              if (uploadObject != null && clazz.isInstance(uploadObject)) {
                    return uploadObject;
              }
        }
        return null;

  }

Answer 1

是的，假设调用者拥有类对象(如果他们能够手动转换，他们就会这样做):

public static <T> T getObject(String xmlString, Class<T> clazz) throws Exception {
    ...
    return (T) uploadObject;
}

调用:

Foo f = getObject(someXml, Foo.class);