I think I have got it! (Almost)...Please take a look.

Question

Hi - I am working on a homework assignment for my Java Programming class and I have already gotten some really good advice here. I am trying to create a program that allows me to Encode/Decode Morse Code and display the cipher text or plain text depending.
I have created one base class MorseCode and have two derived classes EncodeApp and DecodeApp to illustrate the core functionality of the MorseCode class.
I have used a variety of methods. Some directly from my own twisted little mind and others after receiving excellent instruction from some of you in this forum. (thanks)
Essentially, I now have a couple of problems that I am having trouble solving.
1. I cannot figure out how to test for the entry of invalid characters in the morse code part. I mean I do not know how to account for "." and "-" as opposed to looking for valid input with Character.isLetterOrDigit() or isWhiteSpace(). Help!
2. I recieved some help earlier and did my research on HashMaps...of course this was very enlightening. So I basically followed the guidelines given by the instructions I received. But since I am an ethical person, and this is for school, I did not copy the code I received earlier. Now of course I have a bug. Essentially, when I use the Decode() method with the following input:
...<1 Space>---<1 Space>...<3 Spaces>...<1 Space>---<1 Space>... (where <Space> means hitting the spacebar on my keyboard) I should get output of SOS SOS but instead I get SOS SSOS...Why?
I have included the code below:
MorseCode.java
import java.awt.*;
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.Arrays.*;
import java.lang.Character.*;
public class MorseCode extends Object
     //A-Z as elements of char array
     public static char arrayAlpha[] = {'A', 'B', 'C', 'D', 'E', 'F', 'G',
     'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
     'W', 'X', 'Y', 'Z'};
     //A-Z in Morse Code Strings (0-25 indexes in alphabetical order)
     public static String arrayAlphaMorse [] = {".-", "-...","-.-.","-..",".",
     //0-9 as elements of char array
     public static char arrayNumb[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
     //0-9 in Morse Code Strings (0-9 indexes in numberical order beginning at 0)
     public static String arrayNumbMorse [] = {"-----", ".----", "..---", "...--", "....-",
     //All of the characters and numbers with corresponding MC as a hashmap
     public static HashMap cipherKey = new HashMap();
     //String to hold output
     private String output = "";
     public void Encode ( String s )
          char messageArray[];
          String messageIn = "";
          messageIn = s;
          messageArray = messageIn.toCharArray();
          for( int i = 0; i < messageArray.length; i++)
               if(Character.isLetter(messageArray))
               output += arrayAlphaMorse[Arrays.binarySearch(arrayAlpha, messageArray[i])] + " ";
          } else
                    if(Character.isDigit(messageArray[i]))
                         output += arrayNumbMorse[Arrays.binarySearch(arrayNumb, messageArray[i])] + " ";
                    } else
                         if(Character.isWhitespace(messageArray[i]))
                              output += " ";
                         } else
                              if(!(Character.isLetterOrDigit(messageArray[i])) && !(Character.isWhitespace(messageArray[i])))
                                   JOptionPane.showMessageDialog (null, "Unsupported Characters Entered. You may only use letters, numbers and spaces.","Message as Morse Code - System Message", JOptionPane.ERROR_MESSAGE );
          }//EndForLoop
     }//EOEncode
     public void Decode ( String s )
          cipherKey.put( ".-", "A" );
          cipherKey.put( "-...", "B" );
          cipherKey.put( "-.-.", "C" );
          cipherKey.put( "-..", "D" );
          cipherKey.put( ".", "E" );
          cipherKey.put( "..-.", "F" );
          cipherKey.put( "--.", "G" );
          cipherKey.put( "....", "H" );
          cipherKey.put( "..", "I" );
          cipherKey.put( ".---", "J" );
          cipherKey.put( "-.-", "K" );
          cipherKey.put( ".-..", "L" );
          cipherKey.put( "--", "M" );
          cipherKey.put( "-.", "N" );
          cipherKey.put( "---", "O" );
          cipherKey.put( ".--.", "P" );
          cipherKey.put( "--.-", "Q" );
          cipherKey.put( ".-.", "R" );
          cipherKey.put( "...", "S" );
          cipherKey.put( "-", "T" );
          cipherKey.put( "..-", "U" );
          cipherKey.put( "...-", "V" );
          cipherKey.put( ".--", "W" );
          cipherKey.put( "-..-", "X" );
          cipherKey.put( "-.--", "Y" );
          cipherKey.put( "--..", "Z" );
          cipherKey.put( "-----", "0" );
          cipherKey.put( ".----", "1" );
          cipherKey.put( "..---", "2" );
          cipherKey.put( "...--", "3" );
          cipherKey.put( "....-", "4" );
          cipherKey.put( ".....", "5" );
          cipherKey.put( "-....", "6" );
          cipherKey.put( "--...", "7" );
          cipherKey.put( "---..", "8" );
          cipherKey.put( "----.", "9" );
          String input ="";
          String intermsg = "";
          String alphaString = "";
          String morseString = "";
          String delimiter = "#";
          input = s;
          StringBuffer buffer = new StringBuffer(input);
               Problem is that char cannot be dereferenced??? Need to fix.               
               for( int i = 0; i < buffer.length()- 1; i++)
                    if((!(buffer.charAt(i).equals("."))) ||(!(buffer.charAt(i).equals("-"))))
                    JOptionPane.showMessageDialog (null, "Unsupported Characters Entered. You may only use letters, numbers and spaces.","Morse Code as Text - System Message", JOptionPane.ERROR_MESSAGE);     
                    System.exit(0);
               for( int i = 0; i < buffer.length()- 1; i++)
                    if((Character.isWhitespace(buffer.charAt(i))) && (Character.isWhitespace(buffer.charAt(i + 1))))
                         buffer.setCharAt(i + 1, '#');
               intermsg = buffer.toString();
               StringTokenizer tokens = new StringTokenizer( intermsg );
               int length = tokens.countTokens();
               StringBuffer Output = new StringBuffer((length * 2));
               while(tokens.hasMoreTokens())
                         morseString = tokens.nextToken();
                         if(morseString.equals(delimiter))
                              Output.append(" ");
                         } else
                              alphaString = (String)cipherKey.get( morseString );
               Output.append( alphaString != null ? alphaString : delimiter );
               output = Output.toString();
     }//EODecode
     public String Output()
          return output;
}//EOF
EncodeApp.java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class EncodeApp extends MorseCode
     public static void main(String args[] )
          String input ="";
          String intermsg = "";
          String messageIn = "";
          input = JOptionPane.showInputDialog(
"Enter Message to be Converted to Morse Code:");
          intermsg = input.trim();
          messageIn = intermsg.toUpperCase();
          MorseCode e = new MorseCode();
          e.Encode(messageIn);
          JOptionPane.showMessageDialog (null, e.Output(),
          "Message as Morse Code", JOptionPane.INFORMATION_MESSAGE );
          System.exit( 0 );
}//EOF
DecodeApp.java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class DecodeApp extends MorseCode
     public static void main(String args[] )
          String input = "";
          String messageout = "";
          input = JOptionPane.showInputDialog(
               "Enter Morse Code to be Converted to Plain Text:");
          messageout = input;
          MorseCode d = new MorseCode();
          d.Decode(messageout);
          JOptionPane.showMessageDialog (null, d.Output(),
          "Morse Code as Plain Text", JOptionPane.INFORMATION_MESSAGE );
          System.exit( 0 );
}//EOF
Thanks for your help!

Answer 1

Input only <ONE SPACE> after ... --- ...
code may be taking spaces as input
or hard code a stream of " " to = a space in output