~~File I/O~~
- file input/output in Java is fairly similar to other input and output we've been exposed to
- to write to a file we do something along the lines of System.out
 - make a new PrintWriter: PrintWriter pw = new PrintWriter( filename_as_a_string ) ;
 - to write: pw.println( some_string ) ; [ or pw.print( some_string ) if you don't want a new line automatically inserted]
 - close the file: pw.close( ) ;
- to read is more complicated
 - make a FileReader and Scanner:
   FileReader f = new FileReader( filename_as_string ) ;
   Scanner in = new Scanner( in ) ;
 - to read you must have a String variable available:
   String line ;
   line = in.nextLine( ) ;
 - if your data is not a String--for example some sort of numeric type--you must parse it to the proper type
   int x = Integer.parseInt( line ) ; // or Double.parseDouble( ) if of double type
 - close the scanner then file:
   in.close( ) ;
   f.close( ) ;
- see the example java project for more information