Cipher program.. in need of a little guidance

Question

I understand I posted many messages about this subject. But I just wanted to start a new thread on this as a whole. I apologize for that. Anyways I can't get this thing going right... I want to take a repeating key and encode words with it. This program takes text files and the first line is all ints (the repeating keys) and the next lines are ones to be encoded and decoded.
I left a big comment on what I need to do and also if you see any obvious problems please let me know. I really appreciate it. Thanks.
import java.io.*;
import java.util.*;
public class RepeatingKeyCipher<E>
   public static void main(String[] args) throws IOException
        RepeatingKeyCipher obj = new RepeatingKeyCipher();
        File file = new File("in.dat");
        PrintWriter outFile = new PrintWriter(new FileWriter("out.dat"));
          Scanner fileIn = new Scanner(file);
          Queue<Integer> keyNumbers = new LinkedList<Integer>();
          Queue<String> plainText = new LinkedList<String>();
          int keyLine;
          while(fileIn.hasNextInt())
               keyLine = fileIn.nextInt();
               plainText.offer(keyLine);
          keyNumbers.offer(plainText.poll());
          Queue<String> cipher = new LinkedList<String>();
          cipher = obj.encode(keyNumbers, plainText);
          //for(int i = 0; i < message.length; i++) {
     private int front;
     private int rear;
     private int size;
     private char newLetter;
     private String alpha = "abcdefghijklmnopqrstuvwxyz";
     public char encode (Queue<E> key, Queue<E> plain)
     {//returns new letter
        /* From here on you just find a way to seperate the key element.
             Then you seperate the first character from the plain queue.
               Then use the nested loops to convert and add back to a third
               queue. */
        Queue<String> encodedText = new LinkedList<String>;
          StringTokenizer st = new StringTokenizer(message);
          while(st.hasMoreTokens())
               String word = st.nextToken();
               int wordLength = word.length();
               for (int i = 0; i < wordLength; i++)
                     newLetter = alpha.charAt(i + key);
                     if (newLetter > alpha.length())
                         newLetter =alpha.charAt((i + key) - 25);
                         return newLetter;
}

Answer 1

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