Libraries and how you guys use them

This is probably the newbies post I made all day (I make a lot of them) I’d like to know how you guys use libraries in your games because i can’t seem to be able to distribute the game after i get it out of eclipse. I heard jarsplice will do the trick but I would like to have multiple ways on doing this. Also please go into detail on the process because as I can normally get what your talking about sometimes i’m not that lucky.