As a novice how do I use Java effectively in Android studio and Java N IDe

Question

Java coding using Java N IDE

Answer 1

Well, I have no experience with java N IDE but tbh Android Studio in the de facto IDE for Android.
The problem with Android is that it does use java (or kotlin) but it does NOT use the standard library because of the peculiarities of how android's virtual machine work. So you have the java syntax but you have a very different envirorment compared to, say, Oracle's Java.
In Android you have to manage the lifecicle on the app, manage the Activities and their Layouts (which are usually in XML), manage the Manifest file, the resources and so on...
So if you want to write Android apps you have to study Android. Java is a prerequisite but it's not enough.