Making JFrame a parent of JDialog

I decided to start this post again because i was going a bit of the rails before. For now, i am keeping to my original code so i can see where i am going wrong. My JFrame class is my Title class. I have other buttons in this class but the one to concentrate on at the moment is my btnLogin which brings up my Login class, which is a Jdialog. Because the action event on this button was in an inner class, i couldnt make Title the direct parent. So i have made a few changes and made the action event call another class, so that hopefully i can make Title its parent. Here is the code for Title.
import java.awt.*;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.event.KeyListener;
import java.awt.event.*;
public class Title extends JFrame {
     public Title() {
        JPanel cp = new JPanel();
          cp.setLayout(new BorderLayout());
        Icon image = new ImageIcon("london.png");
          JLabel centerPanel1 = new JLabel(image);
        cp.add(centerPanel1, BorderLayout.CENTER);
          cp.add(createTitlePanel(), BorderLayout.NORTH);
          cp.add(createButtonPanel(), BorderLayout.SOUTH);
          setContentPane(cp);
          setTitle("Ner);
          setDefaultCloseOperation(EXIT_ON_CLOSE);
          pack();
     private JPanel createButtonPanel() {
            JButton btnRegister = new JButton("REGISTER");
            JButton btnLogin = new JButton("LOGIN");
            JButton btnExit = new JButton("Exit");
            btnRegister.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent evt) {
                    new Register();
            btnLogin.addActionListener(new LoginListener(this));
            btnExit.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent evt) {
                     cancel();
          JPanel panel = new JPanel();
          JPanel temp = new JPanel(new GridLayout(1,2, 5,5));
          temp.add(btnRegister, BorderLayout.LINE_START);
          temp.setPreferredSize(new Dimension(300, 40));
          temp.add(btnExit, BorderLayout.CENTER);
          temp.setPreferredSize(new Dimension(300, 40));
          temp.add(btnLogin, BorderLayout.LINE_END);
          temp.setPreferredSize(new Dimension(300, 40));
          panel.add(temp);
          return panel;
     private JPanel createTitlePanel() {
          JLabel titleLabel = new JLabel("OFFICIAL RANKINGS");
          titleLabel.setFont(titleLabel.getFont().deriveFont(Font.BOLD, 48));
          titleLabel.setForeground(Color.black);
          JPanel titlePanel = new JPanel();
          titlePanel.setOpaque(false);
          titlePanel.add(titleLabel);
          return titlePanel;
public void cancel(){
     this.dispose();
    public static void main(String[] args) {
          SwingUtilities.invokeLater(new Runnable() {
               public void run() {
                    new Title().setVisible(true);
class LoginListener implements ActionListener {
         JFrame jf;
         LoginListener(JFrame jf) {
              this.jf = jf;
         public void actionPerformed(ActionEvent evt) {
            new Login(jf);
{code}
Now in my Login class, i have created a constructor which accepts a father as an arguement, so that Login can have a parent. Here is the code to this class.
{code}
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.*;
public class Login extends JDialog implements ActionListener
ArrayList personsList;
PersonDAO pDAO;
JLabel userName, passWord;
JTextField userName1;
JPasswordField passWord1;
JButton jbnClear, jbnSubmit, jbnCancel;
String userName2, passWord2;
Container cPane;
public static void main(String args[]){
new Login();
public Login(JFrame father) {
super(father);
public Login()
userName2 = "";
passWord2   = "";
createGUI();
personsList = new ArrayList();
public void createGUI(){
cPane = getContentPane();
setLayout(new GridBagLayout());
//Arrange components on contentPane and set Action Listeners to each JButton
arrangeComponents();
setSize(210,170);
setTitle("Login");
setResizable(false);
setVisible(true);
setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
public void arrangeComponents(){
userName = new JLabel("Username");
passWord = new JLabel("Password");
userName1   = new JTextField(20);
passWord1   = new JPasswordField(20);
jbnClear = new JButton("Clear");
jbnSubmit = new JButton("Submit");
jbnCancel = new JButton("Cancel");
GridBagConstraints gridBagConstraintsx01 = new GridBagConstraints();
gridBagConstraintsx01.gridx = 0;
gridBagConstraintsx01.gridy = 0;
gridBagConstraintsx01.insets = new Insets(5,5,5,5);
cPane.add(userName, gridBagConstraintsx01);
GridBagConstraints gridBagConstraintsx02 = new GridBagConstraints();
gridBagConstraintsx02.gridx = 1;
gridBagConstraintsx02.insets = new Insets(5,5,5,5);
gridBagConstraintsx02.gridy = 0;
gridBagConstraintsx02.gridwidth = 2;
gridBagConstraintsx02.fill = GridBagConstraints.BOTH;
cPane.add(userName1, gridBagConstraintsx02);
GridBagConstraints gridBagConstraintsx03 = new GridBagConstraints();
gridBagConstraintsx03.gridx = 0;
gridBagConstraintsx03.insets = new Insets(5,5,5,5);
gridBagConstraintsx03.gridy = 1;
cPane.add(passWord, gridBagConstraintsx03);
GridBagConstraints gridBagConstraintsx04 = new GridBagConstraints();
gridBagConstraintsx04.gridx = 1;
gridBagConstraintsx04.insets = new Insets(5,5,5,5);
gridBagConstraintsx04.gridy = 1;
gridBagConstraintsx04.gridwidth = 2;
gridBagConstraintsx04.fill = GridBagConstraints.BOTH;
cPane.add(passWord1, gridBagConstraintsx04);
GridBagConstraints gridBagConstraintsx09 = new GridBagConstraints();
gridBagConstraintsx09.gridx = 0;
gridBagConstraintsx09.gridy = 4;
gridBagConstraintsx09.insets = new Insets(5,5,5,5);
cPane.add(jbnClear, gridBagConstraintsx09);
GridBagConstraints gridBagConstraintsx10 = new GridBagConstraints();
gridBagConstraintsx10.gridx = 1;
gridBagConstraintsx10.gridy = 4;
gridBagConstraintsx10.insets = new Insets(5,5,5,5);
cPane.add(jbnSubmit, gridBagConstraintsx10);
GridBagConstraints gridBagConstraintsx11 = new GridBagConstraints();
gridBagConstraintsx11.gridx = 1;
gridBagConstraintsx11.gridy = 5;
gridBagConstraintsx11.insets = new Insets(5,5,5,5);
cPane.add(jbnCancel, gridBagConstraintsx11);
jbnClear.addActionListener(this);
jbnSubmit.addActionListener(this);
jbnCancel.addActionListener(this);
public void actionPerformed (ActionEvent e){
if (e.getSource() == jbnClear){
clear();
else if (e.getSource() == jbnSubmit){
Submit();
else if (e.getSource() == jbnCancel){
cancel();
public void clear(){
userName1.setText("");
passWord1.setText("");
personsList.clear();
public void Submit(){
userName2=userName1.getText();
passWord2 = new String(passWord1.getPassword());
PersonInfo person = new PersonInfo(userName2, passWord2);
if(userName2.equals("") || passWord2.equals("")){
JOptionPane.showMessageDialog(null, "Please complete all fields.");
else
pDAO.loginPerson(person);
public void cancel(){
this.dispose();
{code}
Everything now compiles fine, and i get no runtime errors, but when i click the Login button on my Title page, nothing comes up. So this is where i am at now. Can anyone see my mistake?
cheers

A very simple example that shows concept without showing pretty well laid-out panels:
SimpleLoginMain.java: the main application that shows a login dialog on button press
import java.awt.Dimension;
import java.awt.Window;
import java.awt.Dialog.ModalityType;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class SimpleLoginMain extends JPanel
private JTextField nameTF = new JTextField(10);
private JTextField passwordTF = new JTextField(10);
public SimpleLoginMain()
    setPreferredSize(new Dimension(400, 300)); // so it's bigger than the login pane
    // make textfields in main panel non-editable, so that only the login dialog can change these
    nameTF.setEditable(false);
    passwordTF.setEditable(false);
    add(nameTF);
    add(passwordTF);
    JButton loginBtn = new JButton("Login");
    add(loginBtn);
    loginBtn.addActionListener(new LoginListener());
private class LoginListener implements ActionListener
    public void actionPerformed(ActionEvent arg0)
      SimpleLoginDlgPane dialogPane = new SimpleLoginDlgPane(); // create the login dialog JPanel
      // get parent JFrame as Window. Will use this when we create a JDialog on the line below.
      Window window = SwingUtilities.getWindowAncestor(SimpleLoginMain.this);
      JDialog dialog = new JDialog(window, "Login", ModalityType.APPLICATION_MODAL);
      // add the login dialog JPanel to the JDialog's content pane
      dialog.getContentPane().add(dialogPane);
      dialog.pack();
      dialog.setLocationRelativeTo(null); // center everything
      dialog.setVisible(true); // show as modal dialog box
      // This code only is called after dialog window has been closed
      if (dialogPane.isAccept()) // if presses the dialog's accept button
        // here get the data from the dialog panel and place in the main application
        nameTF.setText(dialogPane.getName());
        passwordTF.setText(dialogPane.getPassword());
// show everything in a thread-safe way
private static void createAndShowUI()
    JFrame frame = new JFrame("Simple Login");
    frame.getContentPane().add(new SimpleLoginMain());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
public static void main(String[] args)
    java.awt.EventQueue.invokeLater(new Runnable()
      public void run()
        createAndShowUI();
}SimpleLoginDlgPane.java: The login JPanel that is shown in a JDialog
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class SimpleLoginDlgPane extends JPanel
private static final String ACCEPT = "Accept"; // avoid silly spelling errors by using a constant
private JTextField nameTF = new JTextField(10);
private JPasswordField passwordPF = new JPasswordField(10);
private boolean accept = false; // is set to true only if the acceptBtn has been pressed
public SimpleLoginDlgPane()
    add(nameTF);
    add(passwordPF);
    JButton acceptBtn = new JButton(ACCEPT);
    add(acceptBtn);
    acceptBtn.addActionListener(new AcceptListener());
public String getName()
    return nameTF.getText();
public String getPassword()
    // I'm not sure of the correct/safe way to get this value
    return String.valueOf(passwordPF.getPassword());
public boolean isAccept()
    return accept;
private class AcceptListener implements ActionListener
    public void actionPerformed(ActionEvent e)
      if (e.getActionCommand().equals(ACCEPT))
        accept = true;
        // get the JDialog or JFrame that holds this JPanel
        Window window = SwingUtilities.getWindowAncestor(SimpleLoginDlgPane.this);
        window.dispose(); // and call dispose on it
}Edited by: Encephalopathic on Jun 14, 2008 9:20 AM

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        add(jScrollPane1, java.awt.BorderLayout.CENTER);
        jButton1.setText("ok");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
        add(jButton1, java.awt.BorderLayout.SOUTH);
        pack();
    /** Closes the dialog */
    private void closeDialog(java.awt.event.WindowEvent evt) {
        setVisible(false);
        dispose();
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        setVisible(false);
        dispose();
    // Variables declaration - do not modify
    private javax.swing.JLabel Jlbl;
    private javax.swing.JButton jButton1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextArea jTextArea1;
    // End of variables declaration
}My problem is that how can i set main window that is JApplet as parent to JDialog so that it should reside inside main window.
Any suggestion would be helpfull.
Thank you in advance.

hi,
I Got solution from following ;
[Open a JDialog from an JApplet|http://forums.sun.com/thread.jspa?forumID=31&threadID=654054]
But when I open the applet in browser and click button from applet to create JDialog, the dialog shown can be moved out side browser window (applet window). how is this happening ?
Your suggestion would definitely help.
Thank you

Change jFrame to be jDialog

I wrote a big application using mostly jFrames as pop up screens to collect data. I only realized now I should have used jDialogs instead. Is there a way to convert the jFrames to jDialog instead of writing all new??

question is - is there a way to convert a jFrame to be a jDialog?They are the same. You use either:
JFrame frame = new JFrame();
or
JDialog dialog = new JDialog();
They both use a content pane and you add components to the content pane the same way whether its a frame or a dialog.
So your question doesn't make sense. You go through the code and change JFrame to JDialog. That is the simplest way.
Of course it is not the best design as was stated in the first reply.

Own JDialog - works with java5, doesn't work with java6

Hello,
I'm working on map editor for a bigger project and I'm stuck with displaying my own JDialog (grrr...). I found out that problem occurs only with java6. See the screenshots below:
java5
http://student.agh.edu.pl/~kdzwinel/Projects/TrafficSim/MapEditor/good.jpg
java6
http://student.agh.edu.pl/~kdzwinel/Projects/TrafficSim/MapEditor/wrong.jpg
And some implementation details:
how do I create new dialog:
NewMapDialog dialog = new NewMapDialog(this);
dialog.setVisible(true);how dialog class looks like:
public class NewMapDialog extends JDialog implements ActionListener, ChangeListener
     NewMapDialog(Main owner)
          super(owner,"New map",true);
          this.setAlwaysOnTop(true);
          this.setSize(200, 280);
          this.setResizable(false);
          this.setLocationRelativeTo(owner);
          makeLayout();
     private void makeLayout()
          Container content = getContentPane();
          content.setLayout(new FlowLayout());
//(...) <- add stuff
}That is so simple that I'm really confused. I will appreciate some help.
Regards,
Konrad
Edited by: kdzwinel on Feb 5, 2008 6:23 PM

kdzwinel wrote:
Hm, creating my applications I extend JFrame, JPanel, JLabel all the time, what is wrong with extending JDialog?In this case your class contained two methods that were already defined to mean something completely different in the class you derived from. That's just one example of what can go wrong when you use inheritance. Had you used composition rather than inheritance (i.e. your class contained a JDialog rather than being a JDialog) this problem would never have happened.
Such an extension was quite natural for me to use because I was looking for this dialog to be modal. And I guess making JFrame modal is not so trivial.
You can make a modal JDialog without extending JDialog, so that's not a problem.
BTW, funny thing is that this 'mistaken' code worked just fine with java5 - I was confused by this fact so my first guess was that I messed something up with panes/layouts.Another reason you should be careful with inheritance: your program may break from implementation changes in the library code you are using and extending. Maybe Java 5 does not use those two methods when it "draws the dialog". Again, had you been using composition your program would not have been affected.
If you can, get your hands on a copy of "Effective Java" by Joshua Bloch, and read chapter 14 "Favor composition over inheritance". He explains this much better than I can.

Effect of super() in JDialog constructor on focusability/modality

Hello again,
this is a JFrame which calls a JDialog which calls a JDialog.
Using super(...) in the constructor of SecondDialog makes this dialog
unfocusable as long as FirstDialog is shown. Without super(...) one can freely
move between the dialogs.
Can somebody exlain what "super" does to produce this difference?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SuperConstructor extends JFrame {
public SuperConstructor() {
    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    setSize(300,300);
    setTitle("Super constructor");
    Container cp= getContentPane();
    JButton b= new JButton("Show dialog");
    b.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent evt) {
     new FirstDialog(SuperConstructor.this);
    cp.add(b, BorderLayout.SOUTH);
    setVisible(true);
public static void main(String args[]) {
    EventQueue.invokeLater(new Runnable() {
      public void run() {
     new SuperConstructor();
class FirstDialog extends JDialog {
    public FirstDialog(final Frame parent) {
      super(parent, "FirstDialog");
      setSize(200,200);
      setLocationRelativeTo(parent);
      setModalityType(Dialog.ModalityType.DOCUMENT_MODAL);
      JButton bNext= new JButton("Show next dialog");
      bNext.addActionListener(new ActionListener() {
     public void actionPerformed(ActionEvent evt) {
       new SecondDialog(parent, false);
      add(bNext, BorderLayout.SOUTH);
      setVisible(true);
int i;
class SecondDialog extends JDialog {
    public SecondDialog(Frame parent, boolean modal) {
      super(parent); // Makes this dialog unfocusable as long as FirstDialog is
shown
      setSize(200,200);
      setLocation(300,50);
      setModal(modal);
      setTitle("SecondDialog "+(++i));
      JButton bClose= new JButton("Close");
      bClose.addActionListener(new ActionListener() {
     public void actionPerformed(ActionEvent evt) {
       dispose();
      add(bClose, BorderLayout.SOUTH);
      setVisible(true);
}

nice day,
there are three areas of get potential problem
1/ FirstDialog helt pernament MODALITY, SecondDialog to have to same ...
2/ there isn't something about change Window focus (if Parent inside of EDT, then you alyway lost focus, meaning SecondDialog)
3/ constructor super inside class doesn't works, block move focus to the SecondDialog (and nonModal)
... but
4/ here is second coins_side [http://forums.sun.com/thread.jspa?messageID=11020377#11020377]
5/ in this form is my example returns similair result, isn't possible setWindow focus for visible JDialog (sure, remove Extend JDialog and create separate constuctor for JDialog, solve that)
6/ maybe I'm wrong
package JDialog;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
* Parent Modal Dialog. When in modal mode, this dialog
* will block inputs to the "parent Window" but will
* allow events to other components
* @see javax.swing.JDialog
public class PMDialog extends JDialog {
    private static final long serialVersionUID = 1L;
    private boolean modal = false;
    private WindowAdapter parentWindowListener;
    private Window owner;
    private JFrame blockedFrame = new JFrame("No blocked frame");
    private JFrame noBlockedFrame = new JFrame("Blocked Frame");
    public PMDialog() {
        noBlockedFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        noBlockedFrame.getContentPane().add(new JButton(new AbstractAction("Test button") {
            private static final long serialVersionUID = 1L;
            @Override
            public void actionPerformed(ActionEvent evt) {
                System.out.println("Non blocked button pushed");
                /*if (blockedFrame.isVisible()) {
                    noBlockedFrame.setVisible(false);
                } else {
                    blockedFrame.setVisible(true);
                noBlockedFrame.setVisible(true);
                blockedFrame.setVisible(true);
        noBlockedFrame.setSize(200, 200);
        noBlockedFrame.setVisible(true);
        blockedFrame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
        blockedFrame.getContentPane().add(new JButton(new AbstractAction("Test Button") {
            private static final long serialVersionUID = 1L;
            @Override
            public void actionPerformed(ActionEvent evt) {
                final PMDialog pmd = new PMDialog(blockedFrame, "Partial Modal Dialog", true);
                pmd.setSize(200, 100);
                pmd.setLocationRelativeTo(blockedFrame);
                pmd.getContentPane().add(new JButton(new AbstractAction("Test button") {
                    private static final long serialVersionUID = 1L;
                    @Override
                    public void actionPerformed(ActionEvent evt) {
                        System.out.println("Blocked button pushed");
                        pmd.setVisible(false);
                        blockedFrame.setVisible(false);
                        noBlockedFrame.setVisible(true);
                pmd.setDefaultCloseOperation(PMDialog.DISPOSE_ON_CLOSE);
                pmd.setVisible(true);
                System.out.println("Returned from Dialog");
        blockedFrame.setSize(200, 200);
        blockedFrame.setLocation(300, 0);
        blockedFrame.setVisible(false);
    public PMDialog(JDialog parent, String title, boolean isModal) {
        super(parent, title, false);
        initDialog(parent, title, isModal);
    public PMDialog(JFrame parent, String title, boolean isModal) {
        super(parent, title, false);
        initDialog(parent, title, isModal);
    private void initDialog(Window parent, String title, boolean isModal) {
        owner = parent;
        modal = isModal;
        parentWindowListener = new WindowAdapter() {
            @Override
            public void windowActivated(WindowEvent e) {
                if (isVisible()) {
                    System.out.println("Dialog.getFocusBack()");
                    getFocusBack();
    private void getFocusBack() {
        Toolkit.getDefaultToolkit().beep();
        super.setVisible(false);
        super.pack();
        super.setLocationRelativeTo(owner);
        super.setVisible(true);
        //super.toFront();
    @Override
    public void dispose() {
        owner.setEnabled(true);
        owner.setFocusableWindowState(true);
        super.dispose();
    @Override
    @SuppressWarnings("deprecation")
    public void hide() {
        owner.setEnabled(true);
        owner.setFocusableWindowState(true);
        super.hide();
    @Override
    public void setVisible(boolean visible) {
        boolean blockParent = (visible && modal);
        owner.setEnabled(!blockParent);
        owner.setFocusableWindowState(!blockParent);
        super.setVisible(visible);
        if (blockParent) {
            System.out.println("Adding listener to parent ...");
            owner.addWindowListener(parentWindowListener);
            try {
                if (SwingUtilities.isEventDispatchThread()) {
                    System.out.println("EventDispatchThread");
                    EventQueue theQueue = getToolkit().getSystemEventQueue();
                    while (isVisible()) {
                        AWTEvent event = theQueue.getNextEvent();
                        Object src = event.getSource();
                        if (event instanceof ActiveEvent) {
                            ((ActiveEvent) event).dispatch();
                        } else if (src instanceof Component) {
                            ((Component) src).dispatchEvent(event);
                } else {
                    System.out.println("OUTSIDE EventDispatchThread");
                    synchronized (getTreeLock()) {
                        while (isVisible()) {
                            try {
                                getTreeLock().wait();
                            } catch (InterruptedException e) {
                                break;
            } catch (Exception ex) {
                ex.printStackTrace();
                System.out.println("Error from EDT ... : " + ex);
        } else {
            System.out.println("Removing listener from parent ...");
            owner.removeWindowListener(parentWindowListener);
            owner.setEnabled(true);
            owner.setFocusableWindowState(true);
    @Override
    public void setModal(boolean modal) {
        this.modal = modal;
    public static void main(String args[]) {
        PMDialog pMDialog = new PMDialog();
}

JTextField.select(int, int) not working in modal JDialog

Hi
I have discovered something peculiar. When I have a JDialog, and it is modal, then the select method of any JTextfield will surely fail. (Only tested on win32)
What the owner is does not matter (even null will give the same result). I made a JFrame for your convenience.
import javax.swing.*;
public class MyDialog extends JDialog
     private JTextField     tf     = new JTextField("not selected >selected< not selected");
     public static void main(String[] args)
          JFrame f = new JFrame("Some parent frame");
          f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          f.setVisible(true);
          new MyDialog(f);
     public MyDialog(JFrame parent)
          super(parent, "Child dialog", /*Selecct modality*/ true);
          // super();
          super.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
          super.add(this.tf);
          super.pack();
          super.setLocation(0, 50);
          super.setVisible(true);
          // Selection does not work when dialog is modal.
          this.tf.select(14, 22);
          this.tf.requestFocus();
}I did not find a bug in the database concerning this.
Did I do something wrong, or should I post this as a bug?

1) Please do not dredge posts that are months or years old. If you have something important to say, create your own thread.
2) If you have the same problem, then use the same solution.
3) If this doesn't work, then show your problem: show your code. We don't want to see all of it, but rather you should condense your code into the smallest bit that still compiles, has no extra code that's not relevant to your problem, but still demonstrates your problem, in other words, an SSCCE (Short, Self Contained, Correct (Compilable), Example). For more info on SSCCEs please look here:
http://homepage1.nifty.com/algafield/sscce.html
Also, when posting your code, please use code tags so that your code will be well-formatted and readable. To do this, either use the "code" button at the top of the forum Message editor or place the tag [code] at the top of your block of code and the tag [/code] at the bottom, like so:
[code]
// your code block goes here.
[/code]

Regarding listener on component in JFrame!!!!!

I am making JFrame having a JPanel added to its North
now in this JPanel i have JButton .
Now i m adding key listener to the JPanel
the problem is when i put focus on button and press any key
the key pressed method is not called
however i read that if button is not registered with listener then the event is dispacthed to its upper hierarchy and so looks for panel to be listened but here nothing is happened
why????????????????
i am confused
let me know whats the problem
thanks in advance
upasna

Hi,
In the new (not very new) event model the events is not propagated
to its parents. So to solve your problem simply add a listener to you Button
instead to your Panel
Hope this help

Frame icon for JDialog

Hi all,
I have a JDialog which is passed an instance of JFrame as parent component in its constructor.
The problem is that if i set the dialog as non resizable, the icon that appears in title bar(top left corner) goes.
It is visible only when the dialog is kept resizable.
Further the dialog is a modal dialog.
Please help,
Regards,
vikalp setya
[email protected]

To work around the bug, add this to your JDialog
      addComponentListener(new ComponentAdapter() {               // need this to prevent window resizing
         public void componentResized(ComponentEvent e) {          // can't use setResizable(false) because then the icon in the title bar is gone
            if (size==null) return; // must be set elsewhere when JDialog is visible
            setSize(size); // restore the original size of JDialog
      });;o)
V.V.

Making JFrame a parent of JDialog

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