title: Work on application and library simultaneously?
body: <p>I'm new to java programming and I would like to work on some kind of game engine / lib. Just as a hobby project / experiment. I would like to make some sort of library with classes and utility functions to be able to re-use some generic game code and then a seperate application where I would build the actual game.</p>
  
  <p>I am using intelliJ as an IDE. I was wondering if I could use, change and test a library with an application at the same time and how I would do this?</p>