so my basic understanding so far is that if I use java to create my app that it will run on both android and ios, with that one app

Answer 1

Unfortunately no. IOS doesn't have a JVM to run the code directly. IOS is run on objective C. There are programs that allow you to write in Java for iOS though, a Google search will help you there.

Answer 2

thank you James

Answer 3

the main objective of developing java was to create platform independent application.. which means compile once and use everywhere... but you must have jre and jvm installed in that platform

Answer 4

download Xamarin or check Xamarin website