Categories
discuss

Java reflection: Find fields of a subclass

I have a class hierarchy like so: (=> means “is a subclass of”) anonymous instance class => abstract class => generic abstract class or more succinctly: C => B => A When executing, “C”…

I have a class hierarchy like so: (=> means “is a subclass of”)

anonymous instance class => abstract class => generic abstract class

or more succinctly:

C => B => A

When executing, “C” calls one of “A”‘s methods. Within that method in “A”, I want to use reflection to find protected fields of the object that are defined in class “B”. (So these are fields that “C” and “B” can see, but not “A”.)

How would I do this with Java reflection? And how can I future-proof it in case I add something between A & B or B & C?

Answer

You have to use getDeclaredFields() repeatedly on each class in the inheritance hierarchy of your object’s class (via getSuperclass()).

However, what you are planning sounds like a nasty violation of the concept of inheritance. The best way of future-proofing would be to avoid this kind of thing entirely. What are you trying to do that you think requires such reflection shenanigans?

Source: stackoverflow
Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. By using this site, you agree to the Privacy Policy, and Copyright Policy. Content is available under CC BY-SA 3.0 unless otherwise noted. The answers/resolutions are collected from stackoverflow, are licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0 © No Copyrights, All Questions are retrived from public domain..