Could a 'realm' be created by Realm Java and be read by Realm for iOS(8)? How cross platform compatible is the Realm Databasing system? I have an idea for a mobile app where I would like to create a 'realm' with a standard java class -- possibly a behind the scene function to a web site -- and then have the mobile app retrieve the 'realm' and read its data. (I hope that made sense.)
Absolutely!
Providing the model object class definitions are the same on both platforms, it's entirely possible to move a Realm file between an iOS device and an Android device (and vice versa) and properly read/write to them! :)
(Disclaimer: I work for Realm.)