title: Java Classes Document Naming
body: <p>I just began learning Java.  My friend who knows much more than me has sent me a few different files which I try to run but it gives me an error.  I appologize as I don't have any of the classes on this computer and can't generate the errors right now but it appears as though the errors are due to the naming of my project as something different than a class in the file.  As soon as I try renaming things it seems to fall apart and cause more problems.  I know this is a total noob question but could someone explain the naming convention of the main class, project name, etc so I can run a project with multiple classes?
  Thank you.</p>