In my book, a project is only organised if I can find the code I'm looking for quickly and easily. Moving a method body out of the class it belongs to will inevitably slow down the search for it.
Though I cannot say what the OP is asking for but my initial guess is he is referring to Separation of Concerns. And if that is the case make a google search on MVC. That would be a good start
I just want to separete my project that is made of one big .java file(448 lines)into more files.I tried to make some classes but it made code complicatedI'm using Jcreator Pro 350 editor and Win XP.