我有一个泛型抽象超类GenericModel,它带有要在子类中调用的方法,如下所示:
public abstract class GenericModel<T extends GenericModel> {
@Transient protected Class<T> entityClass;
public GenericModel() {
Class obtainedClass = getClass();
Type genericSuperclass = null;
for(;;) {
genericSuperclass = obtainedClass.getGenericSuperclass();
if(genericSuperclass instanceof ParameterizedType) {
break;
}
obtainedClass = obtainedClass.getSuperclass();
}
ParameterizedType genericSuperclass_ = (ParameterizedType) genericSuperclass;
entityClass = ((Class) ((Class) genericSuperclass_.getActualTypeArguments()[0]));
// some code
public List<T> getByCreationUser_Id(Long id) {
// method body
return entities;
}
}
我正在使用以下方法扩展该课程:
public class Insurance extends GenericModel<Insurance> {
// some code
}
我想用该类扩展类:
Insurance
,如下所示:public class Liability extends Insurance {
}
和
Liability
类的对象,我想调用方法:getByCreationUser_Id()
,而不是T的列表,我想得到List<Liability>
如下:List<Liability> currentUserInsurances = new Liability().getByCreationUser_Id(1L);
不幸的是,我收到一个错误:
Type mismatch: cannot convert from List<Insurance> to List<Liability>
当我在保险类上调用相同的方法时,它将起作用:
List<Insurance>
我已经尝试过声明类,如下所示:
public class Insurance<T> extends GenericModel<Insurance<T>> {}
public class Liability extends Insurance<Liability> {}
但是id不起作用。发生编译错误。
请帮忙。
最佳答案
您需要将Insurance
类声明为,
public class Insurance<T extends Insurance> extends GenericModel<T> {}
然后,您的
Liability
类为public class Liability extends Insurance<Liability> {}