Q: Random Access Fields

[yaarix]

Hi,
Im probably missing something, but im not sure i understand how random access of fields work in the java api (or in capnproto in general)
lets say i have the following schema:

struct Message {
  id @0 :UInt32;
  field1 @1 :Text;
  field2 @2 :Text;
  field3 @2 :Text;
  field4 @2 :Text;
  }

And during runtime, i might need to access only field1, and field3. how do i do that?
is it just magically happens when i do:
Message.getField1()?

Thanks!