2, 20, 0, 9, 7, 17, ... (100 columns)
1, 3, 22, 11, 0, 0, ...
...
(100 rows)

while ((line = br.readLine()) != null) {
   String[] values = line.split(','); // this heavily uses String
   parseInts(values);
}

while ((r = fileInput.read()) != -1) {
   char c = (char) r;
   if (c != ',' && c != 'n') {
      doSomething(c); // this is problematic when reading 2 digit numbers
   }
}