我已经解决这个问题大约2天了,但仍然无法解决。 我有这个方法:
public List<T> findByKeyValue(String key, String value, Object t) {
Field field;
Class<?> clazz = t.getClass();
field = clazz.getDeclaredField(key);
Type type = field.getType();
if(type.equals(List.class)) {
// HERE IS THE PROBLEM, the value of "field" is "public java.util.List com.cacobr.model.Video.categoryCollection" and categoryCollection is a List <Category>
// **I need to get the class "Category" with Reflection**
// The "field.getGenericType()" command returns "java.util.List <com.cacobr.model.Category>"
// If I could use something like ".getActualTypeArguments()[0]" could return the class "Category" but I can't use this method after a "getGenericType()"
....
}
我可以获得类(class)类别吗?
最佳答案
您应该能够转换为ParameterizedType
:
Type type = field.getGenericType();
if (type instanceof ParameterizedType) {
ParamterizedType pt = (ParameterizedType) type;
if (pt.getRawType() == List.class &&
pt.getActualTypeArguments()[0] == Category.class) {
...
}
}
关于java - 如何从 object.getClass().getDeclaredField ("fieldname").getGenericType(); 返回的 List<T> 获取 typeArguments,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27989292/