Not getting last character

Question

I wrote a method that decrypts encoded text. I have used it before (in another class) so I know that it works. Perhaps I may have just copied it wrong...though I did a copy/paste...or maybe its my coding itself. Either wasy its driving my bonkers. Here is the code I believe is the problem:
        //Decryption method
        private String Decode(String inData){
            int ans2, rn, tmp;
            String ans=new String();
            oldRN=LCG_seed;
            for(int i=0;i<inData.length();i=i+2){
                tmp=Integer.parseInt(inData.substring(i,i+2),LCG_m);
                rn=RN();
                ans2=(tmp^rn)%0xff;
                ans=ans+(char)ans2;
            return ans;
        }//Close Decode methodand it relies on this code:
        //Random Number Generator
        public int RN(){
            int rn;
            rn=(LCG_a*oldRN+LCG_c)%LCG_m;
            oldRN=rn;
            return rn;
        }and
            LCG_a=a;
            LCG_c=c;
            LCG_m=m;
            LCG_seed=s;
            oldRN=LCG_seed;Now the problem is that no matter what I use as the string input, I am always able to decrypt everything but the last character. I wish you guys better luck than I have on finding my error. Oh, and thanks for taking the time to help me. :)

Answer 1

I take in two at a time because the encryption puts it in hexidecimal (not exactly a hardcore encryption, but its what my teacher wants...). Maybe so though. I'm starting to doubt myself on that being the cause though. I keep goig through it and through it without finding an error. So, I am going to post my entire code.
package cryptology;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
* <p>Title: Cryptology</p>
* <p>Description: File to encrypt and decrypt general files using a keyword for
* the decryption and hidden numbers for the encryption.</p>
* <p>Copyright: Copyright (c) 2005</p>
* <p>Company: </p>
* @author Joshua Williams
* @version 1.0
public class Cryptology{
    private static JTextArea input=new JTextArea();
    private static JTextArea output=new JTextArea();
    private static int Found;
    //GUI class
    public class CryptoFrame extends JFrame{
        Container contentPane;
        JMenuBar jMenuBar1=new JMenuBar();
        JMenu jMenuFile=new JMenu();
        JMenuItem jMenuFileExit=new JMenuItem();
        JMenuItem jMenuFileLoad=new JMenuItem();
        JLabel statusBar=new JLabel(" Type the text you wish to encrypt or load the file you wish to decrypt.");
        JLabel origLabel=new JLabel(" Input to Encrypt/Decrypt");
        JLabel outputLabel=new JLabel(" Encryption/Decryption of Input");
        JButton encode=new JButton("Encode");
        JButton decode=new JButton("Decode");
        JScrollPane jScroll=new JScrollPane();
        JScrollPane jScroll2=new JScrollPane();
        public CryptoFrame(){
            contentPane=getContentPane();
            contentPane.setLayout(null);
            setDefaultCloseOperation(EXIT_ON_CLOSE);
            setSize(new Dimension(522, 430));
            setTitle("Encryption/Decryption");
            setLocationRelativeTo(null);
            setResizable(false);
            jMenuFile.setText("File");
            jMenuFileExit.setText("Exit");
            jMenuFileExit.addActionListener(new Exit());
            jMenuFileLoad.setText("Load");
            jMenuFileLoad.addActionListener(new Load());
            encode.addActionListener(new Encode());
            decode.addActionListener(new Decode());
            input.setBorder(BorderFactory.createLineBorder(Color.black));
            output.setBorder(BorderFactory.createLineBorder(Color.black));
            encode.setBorder(BorderFactory.createEtchedBorder());
            decode.setBorder(BorderFactory.createEtchedBorder());
            origLabel.setBounds(new Rectangle(8,0,400,20));
            input.setBounds(new Rectangle(8,20,500,155));
            jScroll.setBounds(new Rectangle(8,20,500,155));
            jScroll.getViewport().add(input);
            encode.setBounds(new Rectangle(290,180,100,25));
            decode.setBounds(new Rectangle(400,180,100,25));
            outputLabel.setBounds(new Rectangle(10,190,400,20));
            output.setBounds(new Rectangle(8,210,500,155));
            jScroll2.setBounds(new Rectangle(8,210,500,155));
            jScroll2.getViewport().add(output);
            statusBar.setBounds(new Rectangle(8,363,400,20));
            jMenuBar1.add(jMenuFile);
            jMenuFile.add(jMenuFileLoad);
            jMenuFile.add(jMenuFileExit);
            setJMenuBar(jMenuBar1);
            contentPane.add(origLabel,null);
            contentPane.add(encode,null);
            contentPane.add(decode,null);
            contentPane.add(outputLabel,null);
            contentPane.add(jScroll,null);
            contentPane.add(jScroll2,null);
            contentPane.add(statusBar,null);
            show();
        }//Close frame constructor
        //Exit class needed for the Exit menubar menu button
        public class Exit implements ActionListener{
            public void actionPerformed(ActionEvent e){
                System.exit(0);
            }//Close exiting action
        }//Close Exit class
        //Load class needed for the Load menubar menu button
        public class Load implements ActionListener{
            public void actionPerformed(ActionEvent e){
                //--------Script a load file action here--------//
            }//Close loading action
        }//Close Load class
        //Encode class needed for the Encode button
        public class Encode implements ActionListener{
            public void actionPerformed(ActionEvent e){
                Crypto c=new Crypto();
                output.setText("");
                output.append(c.Encode(input.getText()));
            }//Close encoding action
        }//Close Encode class
        //Decode class needed for the Decode button
        public class Decode implements ActionListener{
            public void actionPerformed(ActionEvent e){
                output.setText("");
                Crypto c=new Crypto();
                JFrame frame=new JFrame();
                String s="";
                boolean done=false;
                while(done==false){
                    s=(String)JOptionPane.showInputDialog(frame,"Enter a word to search for.",null,JOptionPane.PLAIN_MESSAGE,null,null,null);
                    if((s!=null)&&(s.length()>0)){
                        done=true;
                    else{
                        JOptionPane.showMessageDialog(frame,"A keyword for searching is required for decryption of text.");
                output.append(c.Decode(input.getText()));
                c.Search(s);
            }//Close decoding action
        }//Close Decode class
    }//Close frame class
    public static class Crypto{
        //Global variables for the Crypto class
        private static int LCG_a, LCG_c, LCG_m, LCG_seed, oldRN;
        //Default constructor
        public Crypto(){
            LCG_a=5;
            LCG_c=7;
            LCG_m=16;
            LCG_seed=2;
            oldRN=LCG_seed;
        }//Close default constructor
        //Advanced Constructor
        public void Crypto(int a, int c, int m, int s){
            LCG_a=a;
            LCG_c=c;
            LCG_m=m;
            LCG_seed=s;
            oldRN=LCG_seed;
        }//Close advanced constructor
        //Random Number Generator
        public int RN(){
            int rn;
            rn=(LCG_a*oldRN+LCG_c)%LCG_m;
            oldRN=rn;
            return rn;
        //Encyption method
        private String Encode(String inData){
            char tmp;
            int ans2, rn;
            String ans=new String();
            oldRN=LCG_seed;
            for(int i=0;i<inData.length()-1;i++){
                tmp=inData.charAt(i);
                rn=RN();
                ans2=(int)tmp;
                ans2=(ans2^rn)%0xff;
                ans=ans+Integer.toHexString(ans2);
            return ans;
        }//Close Encode method
        //Decryption method
        private String Decode(String inData){
            int ans2, rn, tmp;
            String ans=new String();
            oldRN=LCG_seed;
            for(int i=0;i<inData.length();i=i+2){
                tmp=Integer.parseInt(inData.substring(i,i+2),LCG_m);
                rn=RN();
                ans2=(tmp^rn)%0xff;
                ans=ans+(char)ans2;
            return ans;
        }//Close Decode method
        //Search method
        public void Search(String s){
            HighlightPainter kolor=new HighlightPainter(Color.red);
            JTextArea Area=new JTextArea();
            Highlighter hl=Area.getHighlighter();
            int StringSize=s.length();
            int Index=0;
            Found=0;
            hl.removeAllHighlights();
            while((Index=output.getText().indexOf(s, Index)) >= 0){
                try{
                    hl.addHighlight(Index, Index+StringSize, kolor);
                    Index=Index+StringSize;
                    Found++;
                }//Close try
                catch(BadLocationException e){
                }//Close catch
            if(Found<=0){
                output.append("\n\nSorry but the keyword was never found.\n\n");
            else{
                output.append("\n\nCongratulations!!! Your keyword was found "+Found+" times.\n\n");
        }//Close Search method
        public static class HighlightPainter extends DefaultHighlighter.DefaultHighlightPainter{
            public HighlightPainter(Color color){
                super(color);
            }//Close HighlightPainter constructor
        }//Close HighlightPainter class
    }//Close crypto class
    public Cryptology(){
        CryptoFrame CF=new CryptoFrame();
    }//Closes cryptology constructor
    //Required main
    public static void main(String[] args){
        Cryptology c=new Cryptology();
    }//Closes the main
}//Closes cryptology classThanks for the quick response by the way.