Ok so this time I will make it more specific.

I want to learn Java only. So I have bought myself a book on Java programming and would like to follow the examples in the book. For doing this on the go (because I don't always have access to my PC) I've downloaded [AIDE](https://play.google.com/store/apps/details?id=com.aide.ui&hl=en), which is basically an IDE for Android phones.

But this app seems to be for android development only. Can I use this to practice Java? Because now when I write anything in Java and compile it, it only outputs what's in the layout XML.