Read a file chracter by character

Question

Right now I am using a String tokenizer to read the file, which is giving me code in tokens, while what I need is to get the file character by character. I'm not sure if there is a way to make the tokenizer read character by character or not, also I have looked into using into using the Scanner class, but sadly this is an assignment for school and the school has not updated their java platform in sometime so the scanner class is not available.
Here is my code thus far:
          StringTokenizer entry;
          System.out.println ("Input file name to be analyzed:");
          BufferedReader keyboardentry = new BufferedReader
               (new InputStreamReader (System.in));
          entry = (new StringTokenizer(keyboardentry.readLine()));
          filename = entry.nextToken();
                                           File dataFile = new File(filename);
          BufferedReader fileReader2 = new BufferedReader
                              (new InputStreamReader
                              (new FileInputStream (dataFile)));
          while(fileReader2.ready())
               fileLine = fileReader2.readLine();
               if(fileLine != null)
                    dataLine += (fileLine + " ");
//     Output input file
     //System.out.println ("Input file: ");
     //system.out.println (dataLine);
//          Load symbols to linked list
          StringTokenizer tokenizer3 = new StringTokenizer (dataLine);
          try     {
               while (tokenizer3.hasMoreTokens())
                    temp = tokenizer3.nextToken();
          catch (NoSuchElementException e)
               System.out.println(e);
               }

Answer 1

Why are you building a String which you then disect into a list.
Why not just put the lines into a list.
For you interest...
        File file = new File(pathname);
        byte[] fileData = new byte[(int) file.length()];
        FileInputStream fis = new FileInputStream(file);
        fis.read(fileData);
        fis.close();
        List lines = Arrays.asList(new String(fileData).split("\\r?\\n"));
        for(int j=0;j<lines.size();j++)
            System.out.println(j+": "+lines.get(j));