My decoding/encoding program that almost works. What's wrong?

Question

I've been working on the following program. After it prompts the user to enter a "code," it is then supposed to examine it and either encode or decode it, depending on what the user entered. All entries from the user that are meant to be decoded need to be inputted in this form: "lkdhe lakdh idhal" (1 space after every five letters, and it can only consist of lower or uppercase letters and the numbers 1-5).
If anything else is entered by the user, the program will encode it. However, I can only get the program to call the encode function, the decode function only comes up when I enter in 1 letter to the console. I'm pretty sure the problem is concerning this loop which is suppose to test to see if the user entered in anything other than a letter or number. I don't think it's doing what I want it to do though. I have another loop to test for the required spaces, and I know that one is working.
for(n = 0; n <= s.length() ;n++)
          s1 = s.substring(n);
          if(Code.CODE1.indexOf(s1) == -1)
               return false;
     }Here is the rest of the code:
import java.util.Scanner;
public class Enc1
public static void main (String []args)
     //String message = args[0];
     //String codedMessage = args[1];
     boolean valid = false;
     int i;
     int j;
     Scanner keyboard = new Scanner(System.in);
    System.out.println("Enter a code");
    String code = keyboard.nextLine();
     System.out.println(code);
     if (isCoded(code))
          System.out.println(decode(code));
     else
          System.out.println(encode(code));
public class Code{
     private static final String CODE1 = "HTNZUL5m3lDQchenpIuORws1jPgVtzKWbfBxXSArdayCJkvqGiF2YoM4E";
     public static final String CODE2 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz ,.;:";
    public static String encode (String message)
          message = "Encode called";
          return message;
         //CODE1.charAt(0);  //0 will equal H
         //CODE1.indexOf(CODE1, 0); //Not sure what it returns
    public static String decode (String codedMessage)
          codedMessage = "Decode called";
          return codedMessage;
     public static boolean isCoded(String s){
     int n;
     int m;
     boolean valid = true;
     String s1;
     for(n = 0; n <= s.length() ;n++)
          s1 = s.substring(n);
          if(Code.CODE1.indexOf(s1) == -1)
               return false;
     for(m = 5; m <= s.length()-1; m = m+6)
               if(s.charAt(m) == ' ')
                     valid = true;
               else
               return false;
     return valid;
    }Any suggestions? I hope I explained my problem clearly enough, I'm a little burnt out on this program, I've been working on it for hours. Any help would be greatly appreciated.

Answer 1

Hey Bud,
I think it wouldnt be really clean to mention
boolean valid = true;in the beginning of your for and if.
I would personally start of by making my booleans false in the beginning and changing it on logic.
HTH