Unexplainable behaviour shown by textArea

unexplainable behaviour shown by textArea . can some one explain the strange behaviour. I have built a JTextArea where is some text in it and the users can enter only " in it and delete only " leave the rest of the original intact . But there is a strange problem when start selecting the text using the mouse and pressing delete key Simultaneously the text i tend to protect is also deleting. I want to know why is this happing. I have attched the code for your referance
import java.awt.BorderLayout;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
public class KeyBoardINputTest extends JPanel {
public KeyBoardINputTest(){
     setLayout(new BorderLayout());
     buildGUI();
private void buildGUI() {
     JTextArea myTA=new JTextArea() {
       public boolean processKeyBinding(KeyStroke ks, KeyEvent e, int condition, boolean pressed) {
          if (e.getKeyChar() == '"') {
            return super.processKeyBinding(ks, e, condition, pressed);
          } else if (ks == KeyStroke.getKeyStroke(KeyEvent.VK_HOME, 0)) {
            return super.processKeyBinding(ks, e, condition, pressed);
          } else if (ks == KeyStroke.getKeyStroke(KeyEvent.VK_END, 0)) {
            return super.processKeyBinding(ks, e, condition, pressed);
          } else if (ks == KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0)) {
            return super.processKeyBinding(ks, e, condition, pressed);
          } else if (ks == KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0)) {
            return super.processKeyBinding(ks, e, condition, pressed);
          } else if (ks == KeyStroke.getKeyStroke(KeyEvent.VK_DELETE, 0)) {
            return super.processKeyBinding(ks, e, condition, pressed);
          } else if (ks == KeyStroke.getKeyStroke(KeyEvent.VK_BACK_SPACE, 0)) {
            return super.processKeyBinding(ks, e, condition, pressed);
          } else {
            return true;
     myTA.setText("JLBHJKBNSJKBNJKSDNB");
     myTA.addKeyListener(new KeyListener() {
       public void keyPressed(KeyEvent e) {
          JTextArea textArea = (JTextArea) e.getSource();
          if (e.getKeyCode() == KeyEvent.VK_BACK_SPACE) {
            int caretPos = textArea.getCaretPosition();
            String text = textArea.getText();
            if (text.length() > (caretPos - 1) && caretPos != 0) {
            if (caretPos - 1 != -1) {
                 if (text.charAt(caretPos - 1) != '"') {
                    e.consume();
          } else if (e.getKeyCode() == KeyEvent.VK_DELETE) {
            int caretPos = textArea.getCaretPosition();
            String text = textArea.getText();
            if (text.length() > caretPos ) {
               if (text.charAt(caretPos) != '"') {
                 e.consume();
       public void keyReleased(KeyEvent e) { }
       public void keyTyped(KeyEvent e) { }
     add(myTA,BorderLayout.CENTER);
public static void main(String args[]) {
     JFrame frm = new JFrame();
     frm.setSize(450,300);
     frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     frm.getContentPane().add(new KeyBoardINputTest());
     frm.setVisible(true);
{code}

I fixed the problem by using my keyListener itself
myTA.addKeyListener(new KeyListener() {
       public void keyPressed(KeyEvent e) {
          JTextArea textArea = (JTextArea) e.getSource();
          if (textArea.getSelectionStart() == textArea.getSelectionEnd()) {
            if (e.getKeyCode() == KeyEvent.VK_BACK_SPACE) {
               int caretPos = textArea.getCaretPosition();
               String text = textArea.getText();
               if (text.length() > (caretPos - 1) && caretPos != 0) {
                 if (caretPos - 1 != -1) {
                    if (text.charAt(caretPos - 1) != '"') {
                      e.consume();
            } else if (e.getKeyCode() == KeyEvent.VK_DELETE) {
            int caretPos = textArea.getCaretPosition();
               String text = textArea.getText();
               if (text.length() > caretPos) {
                 if (text.charAt(caretPos) != '"') {
                    e.consume();
          } else {
            e.consume();
       }

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Have a merry Christmas and a Prosperous New Year.

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Message was edited by: stewiesno1

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will not work at all, unless a document is forms enabled?
If so, that will break an awful lot of existing documents
and not just the ones I produce. On the other hand
if the status quo is to be maintained then flagging
an error just for the /PO event, and not for /U, /D, /Bl, /Fo,
/E, /X seems inconsistent. In any event it would be
nice to have the situation clarified.
Thanks for your response,
James

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