Caesers Shift encryption

				
//**************************************
// Name: Caesers Shift encryption
// Description:Encrypt by shifting x number of characters
// By: Steve Klein
//
// Inputs:Text and Shift
//
// Assumes:Really simple encrypt. Any number (n) encrypts and (-n_ decrypts. This is the most basic of encryptions, but I like the GUI. Im almost done a code for the RSA and maybe I'll post it.....maybe
//
//This code is copyrighted and has// limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=3292&lngWId=2//for details.//**************************************

import java.awt.*;
import java.awt.event.*;
// Java extension packages
import javax.swing.*;
public class TextAreaDemo extends JFrame {
 private JTextArea textArea1, textArea2;
 private JButton copyButton;
 private JTextField textField1;
 // set up GUI
 public TextAreaDemo()
 {
 // super( "TextArea Demo" );
Container container = getContentPane();
container.setLayout( new FlowLayout() );
String string = "attack at dawn";
// set up textArea1
textArea1 = new JTextArea( string, 10, 15 );
container.add( new JScrollPane( textArea1 ) );
textField1 = new JTextField ("Enter shift");
// set up copyButton
copyButton = new JButton( "Encrypt!" );
	 copyButton.addActionListener (
 // anonymous inner class to handle copyButton event
 new ActionListener() {
 // set text in textArea2 to selected
 // text from textArea1
 public void actionPerformed( ActionEvent event )
 {
			 String cText = "";
			 String plainText = textArea1.getText();
			 		//
			 		// prepare plaintext for encryption
			 		//
			 		for ( int i = 0; i < plainText.length(); i++ )
			 		{
			 			if ( plainText.charAt ( i ) != ' ' )
			 			{
			 				cText = cText + plainText.charAt ( i );
			 			}
			 		}
			 		plainText = cText;
			 		cText = "";
			 		for ( int i = 0; i < plainText.length(); i++ ) // do whole string
			 		{
			 			cText = cText + ( char ) ( ( plainText.charAt ( i ) + Integer.parseInt(textField1.getText())) % 256 );
			 		}
textArea2.setText( cText );
 }
 } // end anonymous inner class
); // end call to addActionListener
container.add( copyButton );
container.add(textField1);
// set up textArea2
textArea2 = new JTextArea( 10, 15 );
textArea2.setEditable( false );
container.add( new JScrollPane( textArea2 ) );
setSize( 215, 415);
setVisible( true );
 }
 // execute application
 public static void main( String args[] )
 {
TextAreaDemo application = new TextAreaDemo();
application.setDefaultCloseOperation(
 JFrame.EXIT_ON_CLOSE );
 }
} // end class TextAreaDemo