How does IntelliJ add jar files to a classpath ?

[Josh Abraham]

Hi Guys,

I'm using Intellij and I saw it's pretty easy to add jar files to a project classpath.
I just have to go to File -> Project Structure -> Libraries -> click the '+' button -> choose the jar and that's it.

However, any IDE is a nice and graphic way to present data. Basically, all configurations of a code project are declared in files.
What I want to ask is where is the file that defined the classpath of my project ?  

[Bear Bibeault]

IntelliJ keeps all of its info in files in a hidden folder at the project root named .idea