Visibilty of Internal frame in a parent JFrame when it maximize

i'm working projects on GUI MDI Form.So i've a problem that when we maximize the internal frame
it should go back to Menu bar of parent frame MDI or title bar of perent frame MDI. Minimisable button and maxim button and closed button should be appear on the back of component where'r the internal going .
means we can operate the internal frame minimise and close.
So if anyone who worked on that please help me..............................................

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Similar Messages

How to get Internal frames as well as a background image in a JFrame?

Hi All,
Here's my problem. I have a JFrame with a background image that I got by overridding the paintComponent() method of a JPanel and setting as the contentPane of a JFrame. Works great.
Now what I want is to use internal frames with this Frame a la JInternalFrame classes. But you need to create a JDesktopPane object and set this as the contentPane of the JFrame to get internal frames to work, right? Is there a way for me to have my cake and eat it so I get both internal frames and a background image? Thanks!

Hmmm,
so simple, why didn't I think of that? Damn Mondays!
thanks very much!

Calling MDI parent from Internal Frame

Hello,
I have an InternalFrame that needs to access methods contained within its MDI parent window. So far, to acheive this, I can only think of creating a method within the InternalFrame that accepts the MDI instance (see below). Is there a better way to do this?
Thanks in advance for your input!
PG
class MDIParent
InternalFrame internalFrame = new InternalFrame();
internalFrame.setParent(this);
class InternalFrame
public void setParent(MDIParent instance)
mdiParent = instance;
// now I can call methods in MDIParent using variable 'mdiParent'
}

Hi
Yes you can call an internalFrame from an other
make sure when you run your application to make visible only
one internalFrame (let say internalFrame1) and the other ones to visible(false)
...........jInternalFrame1.setVisible(true);
...........jInternalFrame2.setVisible(false);
...........jInternalFrame3.setVisible(false);
...........jInternalFrame4.setVisible(false);
(Because all the jInternalFrames are initialy activated or iconifyed and you can not navigate
through them programatically.)
from there in jInternalFrame1 you add an event to call an other jinternalFrame
...........jInternalFrame1.setVisible(false); // if you want to come back from jInternalFrame2
...........jInternalFrame2.setVisible(true);
there you will see the internal frame visible
I had the same problems before.
Hope this will help you.

Internal Frames problem

Hi,
I am writing a piece of code where I want to able to choose from a menu a screen that displays multiple graphs (using Internal frames.) I am using cardlayout to bring up the various options I choose from the menu. I have simplified my program as much as possible but I still seem to be getting the same error
Exception in thread "main" java.lang.IllegalArgumentException: adding a window to a container .......
I know I shouldn't be adding a window to a container but I can't see how I can change my code so it has the functionality I desire.
Here is the code I am using
import java.awt.*;
import javax.swing.*;
public class Test extends JFrame
     public Test()
         JPanel card1 = new JPanel();
         card1.add(new InternalFrameDemo());
          getContentPane().add(card1);
    public static void main(String[] args)
          Test frame = new Test();
          frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
          frame.setSize(200, 200);
          frame.setLocationRelativeTo( null );
          frame.setVisible(true);
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class InternalFrameDemo extends JFrame
    JDesktopPane desktop;
    static final int xOffset = 30, yOffset = 30;
    private JLabel graph1;
    private String Graph1;
    public InternalFrameDemo() {
        super("InternalFrameDemo");
        //Make the big window be indented 50 pixels from each edge
        //of the screen.
        int inset = 50;
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        setBounds(inset, inset,
                  screenSize.width - inset*2,
                  screenSize.height - inset*2);
        //Set up the GUI.
        desktop = new JDesktopPane(); //a specialized layered pane
        createFrame(); //create first "window"
        setContentPane(desktop);
        //Make dragging a little faster but perhaps uglier.
        desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
    //Create a new internal frame.
    protected void createFrame() {
        MyInternalFrame frame = new MyInternalFrame();
        frame.setVisible(true);
        desktop.add(frame);
        try {
            frame.setSelected(true);
        } catch (java.beans.PropertyVetoException e) {}
    //Quit the application.
    protected void quit() {
        System.exit(0);
   public void MyInternalFrame() {
     System.out.println("graph1");
     graph1 = new JLabel("",
                   new ImageIcon("../images/Graph1.jpg"),
                   JLabel.CENTER);
     getContentPane().add(graph1);
     //...Then set the window size or call pack...
     setSize(500,550);
}If anyone could point me in the right direction it would be great. Thanks in advance!

But I actually do not understand what that card layout thing is all about. If you want to hide/show internal frames you can simply use setVisible() and setSelected() like examplified below (I did put all code in the same file for my convenince). I have put a text in the label so that you can see that it is replaced. Using aJLabel to show an image is however a little bit weird.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
class MyInternalFrame extends JInternalFrame
private JLabel graph1;
public MyInternalFrame(String text)
    graph1 = new JLabel(text,
                        new ImageIcon("../images/Graph1.jpg"),
                        JLabel.CENTER);
    getContentPane().add(graph1);
    setSize(500,550);
public class InternalFrameDemo extends JFrame
private JDesktopPane desktop;
private final MyInternalFrame[] frames;
public InternalFrameDemo()
    super("InternalFrameDemo");
    frames = new MyInternalFrame[3];
    //Make the big window be indented 50 pixels from each edge of the screen.
    int inset = 50;
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    setBounds(inset, inset,
              screenSize.width - inset*2,
              screenSize.height - inset*2);
    //Set up the GUI.
    desktop = new JDesktopPane(); //a specialized layered pane
    setContentPane(desktop);
    frames[0] = createFrame("Hello world!");
    frames[1] = createFrame("Hello again, world!");
    frames[2] = createFrame("Goodbye cruel world!");
    desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
    setSize(500, 500);
    Thread animThread = new Thread()
        public void run()
          for (int i = 0; i < frames.length; ++i)
            final int frameId = i;
            SwingUtilities.invokeLater(new Runnable()
                public void run()
                  // Hide frame that is showing.
                  if (frameId != 0)
                    frames[frameId - 1].setVisible(false);
                  System.out.println("Replacing image: " + frameId);
                  frames[frameId].setVisible(true);
                  try
                    frames[frameId].setSelected(true);
                  catch (java.beans.PropertyVetoException exc)
                    exc.printStackTrace();
            try
              Thread.sleep(3000);
            catch (InterruptedException exc)
              exc.printStackTrace();
    animThread.start();
//Create a new internal frame.
protected MyInternalFrame createFrame(String text)
    MyInternalFrame frame = new MyInternalFrame(text);
    desktop.add(frame);
    return frame;
public static void main(String[] args)
    JFrame frame = new InternalFrameDemo();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
}Using lazy initialization where you postpone the creation of an internal frame until it is actually shown would be an improvement.
The setVisible/Selected() call can of course be triggered by something else in your application.
Note that changes of swing components shall be made in the EDT.

Openinig internal frames by clicking menuitems

Hi,
I have been trying to open internal frames by clicking menu items but
have not been able to do so because menuitems support only action listeners and not all mouse event listeners.
Actually I wanted the event to return the frame n which the event has occured
e.g., event,getframe(), so that I could create an internal frame in the same frame.
But such kind of function is unavailable.
Kindly suggest something...the code is given below (it works perfectly)..it need a text file from which the menuitems are read. This is also given below:
import javax.swing.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import java.io.*;
import javax.swing.plaf.metal.*;
import javax.swing.*;
import javax.swing.undo.*;
class Action extends JFrame
     ActionListener FListener = new ActionListener()
           public void actionPerformed(ActionEvent event)
              {System.out.println("Menu item " + event.getActionCommand( ) +" of File Menu was pressed.");}
    ActionListener EListener = new ActionListener()
           public void actionPerformed(ActionEvent event)
              {System.out.println("Menu item " + event.getActionCommand( ) +" of Edit Menu was pressed.");}
    ActionListener VListener = new ActionListener()
           public void actionPerformed(ActionEvent event)
              {System.out.println("Menu item " + event.getActionCommand( ) +" of View Menu was pressed.");}
    ActionListener TListener = new ActionListener()
           public void actionPerformed(ActionEvent event)
              {System.out.println("Menu item " + event.getActionCommand( ) +" of Tools Menu was pressed.");}
    ActionListener HListener = new ActionListener()
           public void actionPerformed(ActionEvent event)
              {System.out.println("Menu item " + event.getActionCommand( ) +" of Help Menu was pressed.");}
     /*     protected class MyUndoableEditListener implements UndoableEditListener
              protected UndoManager undo = new UndoManager();
              public void undoableEditHappened(UndoableEditEvent e)
             //Remember the edit and update the menus
             undo.addEdit(e.getEdit());
             undoAction.updateUndoState();
             redoAction.updateRedoState();
      class framecreator extends JFrame
           public JFrame CreateFrame(JMenuBar m)
         JDesktopPane jdp= new JDesktopPane();
          JFrame.setDefaultLookAndFeelDecorated(true);
        JFrame frame = new JFrame("PEA");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(jdp);
        jdp.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
        frame.setJMenuBar(m);
        frame.pack();
        frame.setVisible(true);
        frame.setSize(600,600);
        frame.setLocation(100,100);
        return frame;
      class internalframecreator extends JFrame
         public JInternalFrame CreateInternalFrame(JFrame f)
          Container cp= f.getContentPane();
          JInternalFrame jif = new JInternalFrame("internal frame",true,true,true,true);
         cp.add(jif);
         jif.pack();
         jif.setVisible(true);
         jif.setSize(300,300);
         jif.setLocation(80,80);
         return jif;
class menucreator
     public String[] filereader()
          String[] menuitems=new String[21];
          int i=0,j=0;
          String record = null;
               for(int h=0;h<21;h++){ menuitems[h]=null;}
           try {
                FileReader fr = new FileReader("projectconfig2.txt");
                 BufferedReader br = new BufferedReader(fr);
                     while ( (record=br.readLine()) != null )
                       StringTokenizer st = new StringTokenizer(record,"\n");
                         while (st.hasMoreTokens())
                      menuitems= st.nextToken();
     System.out.println(menuitems[i]);
i++;
               /* StringTokenizer st1 = new StringTokenizer(record,"\n");
     while (st1.hasMoreTokens())
     while ( (record=br.readLine()) != null )
     StringTokenizer st2 = new StringTokenizer(record,":");
     while (st2.hasMoreTokens())
     menuitems[i][j]= st2.nextToken();
     System.out.println(menuitems[i][j]);
          j++;
     i++;
          } catch(IOException e)
     System.out.println("Error reading file");
     return (menuitems);
     public JMenuBar CreateMenu(Action a, String menuitems[])
JMenuBar mb = new JMenuBar();
JMenu fileB = new JMenu(menuitems[0]);
JMenu editB = new JMenu(menuitems[8]);
JMenu viewB = new JMenu(menuitems[11]);
JMenu toolsB = new JMenu(menuitems[14]);
JMenu helpB = new JMenu(menuitems[18]);
mb.add(fileB);
mb.add(editB);
mb.add(viewB);
mb.add(toolsB);
mb.add(helpB);
JMenuItem newpolicyB = new JMenuItem(menuitems[1]);
newpolicyB.addActionListener(a.FListener);
//newpolicyB.addUndoableEditListener(new MyUndoableEditListener());
JMenuItem openB = new JMenuItem(menuitems[2]);
openB.addActionListener(a.FListener);
JMenuItem saveB = new JMenuItem(menuitems[3]);
saveB.addActionListener(a.FListener);
JMenuItem saveasB = new JMenuItem(menuitems[4]);
saveasB.addActionListener(a.FListener);
JMenuItem printxmlB = new JMenuItem(menuitems[5]);
printxmlB.addActionListener(a.FListener);
JMenuItem printreadablepolicyB = new JMenuItem(menuitems[6]);
printreadablepolicyB.addActionListener(a.FListener);
JMenuItem exitB = new JMenuItem(menuitems[7]);
exitB.addActionListener(a.FListener);
JMenuItem undoB = new JMenuItem(menuitems[9]);
undoB.addActionListener(a.EListener);
JMenuItem redoB = new JMenuItem(menuitems[10]);
redoB.addActionListener(a.EListener);
JMenuItem xmlB = new JMenuItem(menuitems[12]);
xmlB.addActionListener(a.VListener);
JMenuItem readablepolicyB = new JMenuItem(menuitems[13]);
readablepolicyB.addActionListener(a.VListener);
JMenuItem validateB = new JMenuItem(menuitems[15]);
validateB.addActionListener(a.TListener);
JMenuItem signandpublishB = new JMenuItem(menuitems[16]);
signandpublishB.addActionListener(a.TListener);
JMenuItem optionsB = new JMenuItem(menuitems[17]);
optionsB.addActionListener(a.TListener);
JMenuItem pemanualB = new JMenuItem(menuitems[19]);
pemanualB.addActionListener(a.HListener);
JMenuItem aboutB = new JMenuItem(menuitems[20]);
aboutB.addActionListener(a.HListener);
fileB.add(newpolicyB);
fileB.add(openB);
fileB.add(saveB);
fileB.add(saveasB);
fileB.add(printxmlB);
fileB.add(printreadablepolicyB);
fileB.add(exitB);
editB.add(undoB);
editB.add(redoB);
viewB.add(xmlB);
viewB.add(readablepolicyB);
toolsB.add(validateB);
toolsB.add(signandpublishB);
toolsB.add(optionsB);
helpB.add(pemanualB);
helpB.add(aboutB);
mb.setSize(300,200);
mb.setVisible(true);
return mb;
public class project
public static void main(String args[])
          Action a =new Action();
          framecreator fc=new framecreator();
     menucreator mc=new menucreator();
     internalframecreator ifc= new internalframecreator();
     ifc.CreateInternalFrame(fc.CreateFrame(mc.CreateMenu(a,mc.filereader())));
The text file called projectconfig2.txt
File
New Policy
Open...
Save
Save As...
Print XML
Print Readable Policy
Exit
Edit
Undo
Redo
View
XML
Readable Policy
Tools
Validate
Sign & Publish
Options
Help
PE Manual
About

The problem is that you are adding the JInternalFrame to the JFrame's contentPane when it should be added to the JDesktopPane. See your code ...
public JInternalFrame CreateInternalFrame( JFrame f )
     Container cp = f.getContentPane();
     JInternalFrame jif = new JInternalFrame("internal frame",true,true,true,true);
     cp.add( jif );

Custom internal frames

Hello,
I have written some custom internal frames, along with their UI's, title panes, and desktop icons. Everything seems to work fine when I'm in JBuilder and I use the "run" command, but when I compile the program and run it as a batch file, my internal frames appear as gray boxes that can't be moved or resized.
package KComponent;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import Theme.*;
import java.io.*;
import javax.swing.border.*;
public class KInternalFrame extends JInternalFrame {
private JLabel titleLabel;
private String title;
public static Color titleColor = Color.white;
public static Color titleBarColor = Theme.DARK;
private KButton maximize, minimize, normalize;
private static final String PATH = "pics" + File.separator;
public KInternalFrame(String title) {
    super(title, true, false, true, true);
    this.title = title;
    this.titleColor = titleColor;
    this.titleBarColor = titleBarColor;
    //getContentPane().add(content, BorderLayout.CENTER);
    //setContentPane(content);
    //LineBorder line = new LineBorder(titleBarColor, 2);
    //setBorder(line);
    setBorder(BorderFactory.createRaisedBevelBorder());
    this.getDesktopIcon().setUI(new KDesktopIconUI(title, titleBarColor, titleColor));
    setUI(new KInternalFrameUI(this));
package KComponent;
import javax.swing.plaf.basic.*;
import javax.swing.*;
import java.awt.*;
import Theme.*;
public class KInternalFrameUI extends BasicInternalFrameUI {
public KInternalFrameUI(JInternalFrame frame) {
    super(frame);
protected void installDefaults(){
      Icon frameIcon = frame.getFrameIcon();
      frame.setFrameIcon(null);
      /* enable the content pane to inherit background color from its
         parent by setting its background color to null. Fixes bug#
         4268949. */
      JComponent contentPane = (JComponent) frame.getContentPane();
      if (contentPane != null) {
        Color bg = contentPane.getBackground();
      else {
        Color bg = null;
      //LookAndFeel.installBorder(frame, "InternalFrame.border");
protected JComponent createNorthPane(JInternalFrame w) {
    titlePane = new KInternalFrameTitlePane(w, w.getTitle(), Theme.DARK, Color.white);
    return titlePane;
package KComponent;
import javax.swing.plaf.basic.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
import Theme.*;
public class KInternalFrameTitlePane extends BasicInternalFrameTitlePane implements ActionListener {
private JInternalFrame frame;
private final String PATH = "pics" + File.separator;
private KButton maxButton;
private KButton minButton;
private KButton normButton;
private JLabel titleLabel;
private File maxIcon = new File(PATH, "maximize.gif");
private File maxOver = new File(PATH, "maximize_rollover.gif");
private File minIcon = new File(PATH, "minimize.gif");
private File minOver = new File(PATH, "minimize_rollover.gif");
private File norIcon = new File(PATH, "normal.gif");
private File norOver = new File(PATH, "normal_rollover.gif");
String title;
Color activeTitle;
Color activeTitleText;
Color inactiveTitle;
Color inactiveTitleText;
public KInternalFrameTitlePane(JInternalFrame frame, String title, Color activeTitle, Color activeTitleText) {
    super(frame);
    this.frame = frame;
    this.title = title;
    this.activeTitle = activeTitle;
    this.activeTitleText = activeTitleText;
    //this.inactiveTitle = inactiveTitle;
    //this.inactiveTitleText = inactiveTitleText;
    installTitlePane();
public void installTitlePane() {
    titleLabel = new JLabel(" " + title + " ");
    titleLabel.setFont(new Font("verdana", Font.PLAIN, 11));
    titleLabel.setForeground(activeTitleText);
    titleLabel.setBorder(null);
    titleLabel.setOpaque(false);
    File icon = new File(PATH, "maximize.gif");
    File rollover = new File(PATH, "maximize_rollover.gif");
    maxButton = new KButton(icon, rollover, rollover, false);
    maxButton.setOpaque(false);
    maxButton.setToolTipText("Maximize window");
    maxButton.setActionCommand("maximize");
    //maxButton.addActionListener(this);
    icon = new File(PATH, "minimize.gif");
    rollover = new File(PATH, "minimize_rollover.gif");
    minButton = new KButton(icon, rollover, rollover, false);
    minButton.setOpaque(false);
    minButton.setToolTipText("Minimize window");
    minButton.setActionCommand("minimize");
    //minButton.addActionListener(this);
    icon = new File(PATH, "normal.gif");
    rollover = new File(PATH, "normal_rollover.gif");
    normButton = new KButton(icon, rollover, rollover, false);
    normButton.setOpaque(false);
    normButton.setToolTipText("Normalize window");
    normButton.setActionCommand("normal");
    //normButton.addActionListener(this);
    JPanel buttonHeader = new JPanel(new GridLayout(1, 3, 0, 0));
    buttonHeader.setOpaque(false);
    buttonHeader.add(minButton);
    buttonHeader.add(normButton);
    buttonHeader.add(maxButton);
    JPanel titlePane = new JPanel(new BorderLayout());
    titlePane.setBackground(activeTitle);
    titlePane.add(titleLabel, BorderLayout.WEST);
    titlePane.add(buttonHeader, BorderLayout.EAST);
    setBackground(activeTitle);
    setLayout(new BorderLayout());
    //add(titleLabel, BorderLayout.WEST);
    //add(buttonHeader, BorderLayout.EAST);
    add(titlePane, BorderLayout.CENTER);
    //installDefaults();
    createActions();
    enableActions();
    //createActionMap();
    assembleSystemMenu();
    createButtons();
protected void createButtons() {
      minButton.addActionListener(iconifyAction);
      minButton.setActionCommand("minimize");
      minButton.addActionListener(this);
      maxButton.addActionListener(maximizeAction);
      maxButton.setActionCommand("maximize");
      maxButton.addActionListener(this);
      normButton.addActionListener(restoreAction);
      normButton.setActionCommand("normal");
      normButton.addActionListener(this);
      //setButtonIcons();
public void setButtonIcons() {}
public void actionPerformed(ActionEvent e) {
    String command = e.getActionCommand();
    if (command.equals("maximize")) {
      maxButton.setEnabled(false);
      minButton.setEnabled(true);
    else if (command.equals("minimize")) {
      //maxButton.setEnabled(true);
      //minButton.setEnabled(false);
    else if (command.equals("normal")) {
      maxButton.setEnabled(true);
      minButton.setEnabled(true);
package KComponent;
import javax.swing.plaf.basic.BasicDesktopIconUI;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
import javax.swing.border.*;
public class KDesktopIconUI extends BasicDesktopIconUI {
private final String PATH = "pics" + File.separator;
private File norIcon = new File(PATH, "normal.gif");
private File norOver = new File(PATH, "normal_rollover.gif");
JComponent iconPane;
String title;
Color activeTitle;
Color activeTitleText;
KButton norButton;
MouseInputListener mouseInputListener;
public KDesktopIconUI(String title, Color activeTitle, Color activeTitleText) {
    this.title = title;
    this.activeTitle = activeTitle;
    this.activeTitleText = activeTitleText;
protected void installComponents() {
      frame = desktopIcon.getInternalFrame();
      norButton = new KButton(norIcon, norOver, norOver, false);
      norButton.setOpaque(true);
      norButton.setBackground(activeTitle);
      iconPane = new JPanel(new BorderLayout());
      JLabel jlTitle = new JLabel(" " + title + " ");
      jlTitle.setFont(new Font("verdana", Font.PLAIN, 11));
      jlTitle.setForeground(activeTitleText);
      jlTitle.setBackground(activeTitle);
      jlTitle.setOpaque(true);
      iconPane.add(jlTitle, BorderLayout.CENTER);
      iconPane.add(norButton, BorderLayout.EAST);
      desktopIcon.setLayout(new BorderLayout());
      desktopIcon.add(iconPane, BorderLayout.CENTER);
      desktopIcon.setBackground(activeTitle);
      desktopIcon.setForeground(activeTitleText);
      iconPane.setBorder(BorderFactory.createRaisedBevelBorder());
      desktopIcon.setBorder(null);
protected void installListeners() {
      mouseInputListener = createMouseInputListener();
      desktopIcon.addMouseMotionListener(mouseInputListener);
      desktopIcon.addMouseListener(mouseInputListener);
      norButton.addMouseListener(new MouseAdapter() {
        public void mousePressed(MouseEvent e) {
          deiconize();
public Dimension getMinimumSize(JComponent c) {
      return iconPane.getMinimumSize();
public Dimension getMaximumSize(JComponent c){
      return iconPane.getMaximumSize();
public Dimension getPreferredSize(JComponent c) {
      JInternalFrame iframe = desktopIcon.getInternalFrame();
      Border border = iframe.getBorder();
      int w2 = 157;
      int h2 = 18;
      //if(border != null)
          //h2 += border.getBorderInsets(iframe).bottom +
            //    border.getBorderInsets(iframe).top;
      return new Dimension(w2, h2);
protected void uninstallComponents() {
      desktopIcon.setLayout(null);
      desktopIcon.remove(iconPane);
package KComponent;
import javax.swing.*;
import java.awt.*;
import Theme.*;
import javax.swing.plaf.metal.*;
public class KDesktop extends JDesktopPane {
ImageIcon icon;
boolean isWatermark;
JInternalFrame gb, proj, stat, cal;
boolean gbOpen, projOpen, statOpen, calOpen;
public KDesktop(boolean isWatermark) {
    this.isWatermark = isWatermark;
    icon = Theme.getBackground();
    setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
public void setBackgroundImage(ImageIcon i) {
    icon = i;
public ImageIcon getBackgroundImage() {
    return icon;
public void paintComponent(Graphics g) {
    super.paintComponent(g);
    if (!isWatermark) {
      if (getWidth() > icon.getIconWidth() || getHeight() > icon.getIconHeight()){
        g.drawImage(icon.getImage(), 0,0, getWidth(), getHeight(), null);
      else {
        if (getProportionalHeight(getWidth()) < getHeight()) {
          g.drawImage(icon.getImage(), 0, 0,
                      getProportionalWidth(getHeight()), getHeight(), null);
        else
          g.drawImage(icon.getImage(), 0,0,
                      getWidth(), getProportionalHeight(getWidth()), null);
    else {
      int w = icon.getIconWidth();
      int h = icon.getIconHeight();
      if (w == '\u0000' || h == '\u0000') {
        super.paint(g);
      else {
        int currX = 0;
        int currY = 0;
        boolean keepPainting = true;
        while (keepPainting) {
          if (currX < (getWidth()+w/2)) {
            g.drawImage(icon.getImage(), currX, currY, null);
            currX += w;
          else if (currY < (getHeight()+h/2)) {
            currX = 0;
            currY += h;
            g.drawImage(icon.getImage(), currX, currY, null);
          else keepPainting = false;
public int getProportionalHeight(int width) {
    double percentage = (double)width/icon.getIconWidth();
    return (int)(percentage*icon.getIconHeight());
public int getProportionalWidth(int height) {
    double percentage = (double)height/icon.getIconHeight();
    return (int)(percentage*icon.getIconWidth());
}Any ideas? I don't see how everything could work fine within the JBuilder environment and then screw up when I compile the code.
Thanks for any help.

And this is how I call up the UI from my main function:
displayFrame.setUI(new MyInternalFrameUI(intFrame));Thanks!

How do I only allow 1 internal frame to be added?

Could you pls show me how can I do this, I need some code to learn how this code work.
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Test1a extends JFrame
     private JLabel label1;
//     private JLabel label2;
     private JLabel label3;
     private JLabel label4;
     private JLabel label5;
     private JDesktopPane theDesktop;
     public Test1a()
          super("TESTING JLABEL");
          setLayout(new BorderLayout(5, 5));
        JMenuBar bar = new JMenuBar();
      JMenu addMenu = new JMenu( "Add" );
      JMenuItem newFrame = new JMenuItem( "Internal Frame" );
      addMenu.add( newFrame );
      bar.add( addMenu );
      setJMenuBar( bar );
       theDesktop = new JDesktopPane();
      add( theDesktop, BorderLayout.CENTER );
      newFrame.addActionListener(
         new ActionListener()
            // display new internal window
            public void actionPerformed( ActionEvent event )
               // create internal frame
               JInternalFrame frame = new JInternalFrame("Internal Frame", true, true, true, true);
               MyJPanel panel = new MyJPanel();
               frame.add( panel, BorderLayout.CENTER );
               frame.pack(); // set internal frame to size of contents
               theDesktop.add( frame );
               frame.setVisible( true );
          label1= new JLabel ();
          label1.setText("Label 1");
          add(label1, BorderLayout.WEST);
     //     label2= new JLabel ("Label 2", SwingConstants.CENTER);
     //   add(label2, BorderLayout.CENTER);
          label3= new JLabel ();
          label3.setText("Label 3");
          add(label3, BorderLayout.EAST);
          label4= new JLabel ("Label 4", SwingConstants.CENTER);
          add(label4, BorderLayout.NORTH);
          label5= new JLabel ("Label 5", SwingConstants.CENTER);
          add(label5, BorderLayout.SOUTH);
=============================================
import java.awt.*;
import javax.swing.*;
// class to display an ImageIcon on a panel
class MyJPanel extends JPanel
   private ImageIcon imageIcon;
   // load image
   public MyJPanel()
      imageIcon = new ImageIcon("yellowflowers.png");
   // display imageIcon on panel
   public void paintComponent( Graphics g )
      super.paintComponent( g );
      imageIcon.paintIcon( this, g, 0, 0 );
   public Dimension getPreferredSize()
      return new Dimension( imageIcon.getIconWidth(), imageIcon.getIconHeight() );
========================================
import javax.swing.*;
public class Test1b
     public static void main (String args[])
          Test1a test1a = new Test1a();
          test1a.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          test1a.setSize(800, 600);
          test1a.setVisible(true);
}

You where given an answer in your original posting:
http://forum.java.sun.com/thread.jspa?threadID=5146301

Getting the Parent JFrame or JDialog

I am trying to get the parent JFrame or JDialog so I can change the cursor. Right now I am doing it in a stupid way by doing this:
private void changeCursorQuestion(){
          JFrame frame=(JFrame) getParent().getParent().getParent().getParent().getParent().getParent().getParent();
          Cursor cursor=new Cursor(Cursor.HAND_CURSOR);
          frame.setCursor(cursor);
     }//end changeCursorQuestionBut is there an easier and of course better way of getting the frame or jdialog that a panel is in?

I am trying to get the parent JFrame or JDialog so I can change the cursor. You can change the cursor of the JPanel ( in fact any Container) so why use that getParent() thing....
Also, if you want to have quick refrence to JFrame object from JPanel, extend JPanel to make a new class and have a refrence to that JFrame/JDialog in that class, that way you can access it quickly.
Thanks!

Modal Internal Frames and JCombos

Hi,
I'm trying to create a modal internal frame as suggested in Sun's TechTip:
http://developer.java.sun.com/developer/JDCTechTips/2001/tt1220.html
All I need is to block the input for the rest of the GUI, I don't care about real modality (the setVisible() call returns immediately).
I need to have a JComboBox in my internal frame. It turns out that under JDK1.4.0/1.4.1 the list for the combo is visible only with the Windows Look And Feel, while in every other JDK version it's not visible, except for the portion falling out of the internal frame.
The code to verify this follows. Does anybody know how to fix this? I've opened a bug for it, but I was wondering if someone can help in the forum...
Run the application passing "Windows" or "CDE/Motif", click on "open" and play with the combo to observe the result.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class Modal {
static class ModalAdapter
extends InternalFrameAdapter {
Component glass;
public ModalAdapter(Component glass) {
this.glass = glass;
// Associate dummy mouse listeners
// Otherwise mouse events pass through
MouseInputAdapter adapter =
new MouseInputAdapter(){};
glass.addMouseListener(adapter);
glass.addMouseMotionListener(adapter);
public void internalFrameClosed(
InternalFrameEvent e) {
glass.setVisible(false);
public static void main(String args[]) {
System.out.println("Installed lookAndFeels:");
UIManager.LookAndFeelInfo[] lafInfo = UIManager.getInstalledLookAndFeels();
for(int i=0; i<lafInfo.length; i++) {
System.out.println(lafInfo.getName());
String lookAndFeel = null;
if (args.length>0)
lookAndFeel = args[0];
initLookAndFeel(lookAndFeel);
final JFrame frame = new JFrame(
"Modal Internal Frame");
frame.setDefaultCloseOperation(
JFrame.EXIT_ON_CLOSE);
final JDesktopPane desktop = new JDesktopPane();
ActionListener showModal =
new ActionListener() {
public void actionPerformed(ActionEvent e) {
// Manually construct a message frame popup
JOptionPane optionPane = new JOptionPane();
optionPane.setMessage("Hello, World");
optionPane.setMessageType(
JOptionPane.INFORMATION_MESSAGE);
// JInternalFrame modal = optionPane.
// createInternalFrame(desktop, "Modal");
                    JInternalFrame modal = new JInternalFrame("test", true, true, true);
JPanel jp = (JPanel )modal.getContentPane();
          JComboBox jcb = new JComboBox(new String[]{"choice a", "choice b"});
jp.setLayout(new BorderLayout());
          jp.add(jcb,BorderLayout.NORTH);
          jp.add(new JTextArea(),BorderLayout.CENTER);
// create opaque glass pane
JPanel glass = new JPanel();
glass.setOpaque(false);
// Attach modal behavior to frame
modal.addInternalFrameListener(
new ModalAdapter(glass));
// Add modal internal frame to glass pane
glass.add(modal);
// Change glass pane to our panel
frame.setGlassPane(glass);
// Show glass pane, then modal dialog
modal.setVisible(true);
glass.setVisible(true);
System.out.println("Returns immediately");
JInternalFrame internal =
new JInternalFrame("Opener");
desktop.add(internal);
JButton button = new JButton("Open");
button.addActionListener(showModal);
Container iContent = internal.getContentPane();
iContent.add(button, BorderLayout.CENTER);
internal.setBounds(25, 25, 200, 100);
internal.setVisible(true);
Container content = frame.getContentPane();
content.add(desktop, BorderLayout.CENTER);
frame.setSize(500, 300);
frame.setVisible(true);
private static void initLookAndFeel(String lookAndFeel) {
String lookAndFeelClassName = null;
UIManager.LookAndFeelInfo[] lafInfo = UIManager.getInstalledLookAndFeels();
for(int i=0; i<lafInfo.length; i++) {
if (lafInfo[i].getName().equals(lookAndFeel)) {
lookAndFeelClassName = lafInfo[i].getClassName();
if (lookAndFeelClassName == null)
System.err.println("No class found for lookAndFeel: "+ lookAndFeel);
try {
UIManager.setLookAndFeel(lookAndFeelClassName);
} catch (ClassNotFoundException e) {
System.err.println("Couldn't find class for specified look and feel:"
+ lookAndFeel);
System.err.println("Did you include the L&F library in the class path?");
System.err.println("Using the default look and feel.");
} catch (UnsupportedLookAndFeelException e) {
System.err.println("Can't use the specified look and feel ("
+ lookAndFeel
+ ") on this platform.");
System.err.println("Using the default look and feel.");
} catch (Exception e) {
System.err.println("Couldn't get specified look and feel ("
+ lookAndFeel
+ "), for some reason.");
System.err.println("Using the default look and feel.");
e.printStackTrace();

Hi,
Had exactly the same problem. Seems there are plenty of similar problems all related to the glass pane, so have solved the problem here by putting the event-blocking panel onto the MODAL_LAYER of the layered pane, rather than replacing the glass pane. Otherwise pretty much the same technique - you may need a property change listener to track changes in the size of the layered pane
something like ...
layer = frame.getLayeredPane();
glass.setSize (layer.getSize()); // will need to track size
glass.add (modal);
layer.add(glass, JLayeredPane.MODAL_LAYER, 0);
I've modified the original examples so the frames can be re-used so you may have to play around with the example a bit
Hope it helps
cheers.

A Internal frame problem: Please help me

How can you add a panel to internal frame and show it. I add a image buffer to a panel and then I want to add that panel to internal frame which exists in a main frame. Please help me with code snippet as I am unable to it since morning and struck with my progress in my work. I will be thanki ful/
regards,
Ravi.

Have a look at the code I took from the excellent FREE java swing book you can get here http://www.manning.com/sbe/
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
public class CommonLayouts extends JFrame {
public Integer LAYOUT_FRAME_LAYER = new Integer(1);
public CommonLayouts() {
super("Common Layout Managers");
setSize(500, 460);
JDesktopPane desktop = new JDesktopPane();
getContentPane().add(desktop);
JInternalFrame fr1 =
new JInternalFrame("FlowLayout", true, true);
fr1.setBounds(10, 10, 150, 150);
Container c = fr1.getContentPane();
c.setLayout(new FlowLayout());
c.add(new JButton("1"));
c.add(new JButton("2"));
c.add(new JButton("3"));
c.add(new JButton("4"));
desktop.add(fr1, 0);
fr1.show();
JInternalFrame fr2 =
new JInternalFrame("GridLayout", true, true);
fr2.setBounds(170, 10, 150, 150);
c = fr2.getContentPane();
c.setLayout(new GridLayout(2, 2));
c.add(new JButton("1"));
c.add(new JButton("2"));
c.add(new JButton("3"));
c.add(new JButton("4"));
desktop.add(fr2, 0);
fr2.show();
JInternalFrame fr3 =
new JInternalFrame("BorderLayout", true, true);
fr3.setBounds(330, 10, 150, 150);
c = fr3.getContentPane();
c.add(new JButton("1"), BorderLayout.NORTH);
c.add(new JButton("2"), BorderLayout.EAST);
c.add(new JButton("3"), BorderLayout.SOUTH);
c.add(new JButton("4"), BorderLayout.WEST);
desktop.add(fr3, 0);
fr3.show();
JInternalFrame fr4 = new JInternalFrame("BoxLayout - X",
true, true);
fr4.setBounds(10, 170, 250, 80);
c = fr4.getContentPane();
c.setLayout(new BoxLayout(c, BoxLayout.X_AXIS));
c.add(new JButton("1"));
c.add(Box.createHorizontalStrut(12));
c.add(new JButton("2"));
c.add(Box.createGlue());
c.add(new JButton("3"));
c.add(Box.createHorizontalGlue());
c.add(new JButton("4"));
desktop.add(fr4, 0);
fr4.show();
JInternalFrame fr5 = new JInternalFrame("BoxLayout - Y",
true, true);
fr5.setBounds(330, 170, 150, 200);
c = fr5.getContentPane();
c.setLayout(new BoxLayout(c, BoxLayout.Y_AXIS));
c.add(new JButton("1"));
c.add(Box.createVerticalStrut(10));
c.add(new JButton("2"));
c.add(Box.createGlue());
c.add(new JButton("3"));
c.add(Box.createVerticalGlue());
c.add(new JButton("4"));
desktop.add(fr5, 0);
fr5.show();
JInternalFrame fr6 =
new JInternalFrame("SpringLayout", true, true);
fr6.setBounds(10, 260, 250, 170);
c = fr6.getContentPane();
c.setLayout(new SpringLayout());
c.add(new JButton("1"), new SpringLayout.Constraints(
Spring.constant(10),
Spring.constant(10),
Spring.constant(120),
Spring.constant(70)));
c.add(new JButton("2"), new SpringLayout.Constraints(
Spring.constant(160),
Spring.constant(10),
Spring.constant(70),
Spring.constant(30)));
c.add(new JButton("3"), new SpringLayout.Constraints(
Spring.constant(160),
Spring.constant(50),
Spring.constant(70),
Spring.constant(30)));
c.add(new JButton("4"), new SpringLayout.Constraints(
Spring.constant(10),
Spring.constant(90),
Spring.constant(50),
Spring.constant(40)));
c.add(new JButton("5"), new SpringLayout.Constraints(
Spring.constant(120),
Spring.constant(90),
Spring.constant(50),
Spring.constant(40)));
desktop.add(fr6, 0);
fr6.show();
desktop.setSelectedFrame(fr6);
public static void main(String argv[]) {
CommonLayouts frame = new CommonLayouts();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);

Adding a "Page" effect to an Internal Frame

Hi all,
This topic is in the 2D thread but i have possibly used the wrong forum.
I am developing a gui that uses an internal frames as a user workspace.
The internal frame has a canvas on it an i was intending to add 2D objects to the canvas . EG a UML editor.
I want the canvas(Do i need a canvas or may i add 2D objects directly to the frame, or use a jpanel to keep all the components swing?) to look similar to a word/ visio application
where there is an A4/ letter /A3... Page on the internal Frame. If the user creates a 'New' project a new InternalFrame object is created with the "blank" document waiting for a creative touch ;)
and goto begining...
I have the GUI upp and running so far but can find any ideas on how to implement the "Word Doc" type internal look.
I susspect i am correct in saying that i can use scale to "Zoom" in and out of the document.
any suggestions would be most welcome.
Regards,
Graham

Here is a working sample.
Only 2 classes are left, the Destop class was useless.
See how actions are managed (I implemented the "New" function)
I leave you the imagination for the rest...
GUIMainFrame.java:
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JToolBar;
public class GUIMainFrame extends JFrame {
   public JMenuBar menuBar = new JMenuBar();
   public JToolBar toolbar = new JToolBar();
   public JDesktopPane desktop = new JDesktopPane();
   public GUIMainFrame() {
      super("UML database Design Editor");
      initComponents();
      this.setName("GUIMain");
   private JMenu createMenu(String title, int nbitems) {
      JMenu menu = new JMenu(title);
      for (int i=0; i<nbitems; i++) {
         JMenuItem item = new JMenuItem("option "+i);
         menu.add(item);
      return menu;
   private JButton createButton(Action action) {
      JButton button = new JButton(action);
      return button;
   private void initComponents() {
      setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
      menuBar.add(createMenu("File", 5));
      menuBar.add(createMenu("Edit", 3));
      menuBar.add(createMenu("Help", 1));
      setJMenuBar(menuBar);
      toolbar.add(createButton(new DesktopAction("new")));
      toolbar.add(createButton(new DesktopAction("open")));
      toolbar.add(createButton(new DesktopAction("save")));
      this.getContentPane().add(toolbar, BorderLayout.NORTH);
      this.getContentPane().add(desktop, BorderLayout.CENTER);
      this.setSize(400,400);
      this.setVisible(true);
   public static void main(String[] args) {
      new GUIMainFrame();
   // Manages actions sent to the application
   private void doAction(String name) {
       if (name.equals("new")) {
          Project project = new Project();
          desktop.add(project);
          project.toFront();
          project.setVisible(true);
       else if (name.equals("open")) {
       else if (name.equals("save")) {
   // Class defining the actions to send to the application
   private class DesktopAction extends AbstractAction {
      public DesktopAction(String name) {
         super(name, new ImageIcon(name + "16.gif"));
      /* (non-Javadoc)
       * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
      public void actionPerformed(ActionEvent event) {
         // the action is only redispatched to the application
         doAction(event.getActionCommand());
Project.java:
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;
public class Project extends JInternalFrame {
   static int projectCount = 0, projectX = 20, projectY = 20;
   /** Creates a new instance of Project */
   public Project() {
      super("Project: " + (++projectCount), true,   //resizable
               true,   //closable
               true,   //maximizable
               true); //iconifiable
      JPanel p = new JPanel();
      p.setOpaque(true);
      p.setBackground(Color.WHITE);
      p.setPreferredSize(new Dimension(200, 200));
      this.setLocation(projectX, projectY);
      this.setContentPane(p);
      this.pack();
      projectX += 20;
      if (projectX >= 220) {
         projectX= 20;
         projectY += 20;
}Regards.

Getting the size of an internal frame?

Hi allm
I want to be able to get the size of an internal frame. I have set the size of the main JFrame to that of Windows by calling Toolkit.getScreenSize(); But i can't seem to find an equivalent for internal frames.
Basically I have two components in the internal frame that I want to have equal width. I was going to find out the size of the internal frame and then half it and applay a horizontal strut to each component.
If there is a better way of doing it i'm open to suggestions but any help at all is much appreciated
Thanks
Dylan
BorderLayout border = new BorderLayout();
         content.setLayout(border);
         Box left = Box.createVerticalBox();
         left.add(Box.createHorizontalStrut(400));
         JPanel Create = new JPanel();
             Create.setBorder(new TitledBorder (new EtchedBorder(), "Create Database"));
             left.add(Create);
             Box right = Box.createVerticalBox();
             right.add(Box.createHorizontalStrut(400));
             JPanel Help = new JPanel();
             Help.setBorder(new TitledBorder (new EtchedBorder(), "Help"));
             right.add(Help);
             content.add(left, BorderLayout.CENTER);
             content.add(right, BorderLayout.CENTER);

The situation is that I have a class that has about 80
instance fields of basic data types. But it was
getting overly complicated. As a number of these
fields related to year and day data I tried to
re-write with GregorianCalendar instead.
There are in the region of 45,000 instance of my clas
being held in an array, however when I tried to use my
modified class (with the Calendar fields replacing the
basic data types) I kept running into OutOfMemoryError
after about 25,000 instances were created. So I
figured that the GregorianCalendar class must be
eating up my memory. Was intrigued, but couldn't find
out how to calculate the size of my new class.
Hmmm, serialize it you say? Ok, I'll try that.ok don't do that ;)
ummm i was giving advice assuming (incorrectly i turns out) that you were trying to see how much space the serialized object would take up when written to disk or over a network etc.
this does not appear to be your problem.
so here are my new more informed suggestions.
1) if you were going to write out the "data" parts of your object so
it could be re-created what would they be. i'm thinking you could
just boil it all down maybe to a long as in Date.getTime(); then
you could have a long[] array with 45,000 slots. this should take up far less memory than having myObject[] with 45,000 slots. then you
could have one actual object that you insert the data into to play
around with. this may not be the idealists solution but if you have a
lot of objects you may not want to carry around all the excess
stuff.
2) as an aside you say you tried to re-write the GregorianCalendar...
have your tried extending it or extending Calendar. the idea of
extending other non-final classes is you can provide your own
implementation of some things or add totally new methods without having
to re-write an existing class.
just some ideas...

Canvas on the Internal Frame overlap the Menus.!!!

hi friends
i have added canvas on the internal frame(contentpane).
when internal frame appears on the screen menus are being overlapped.
it means if i open the menu they will be hide behind canvas and can not be seen.
plzz guide me what to do?

This is a typical problem when mixing Swing (JFrame) components with AWT components (Canvas). Make sure you stick to only one of these GUI packages when implementing your own gui.
Have a look at the java tutorial.
http://java.sun.com/docs/books/tutorial/uiswing/painting/overview.html
Manuel Amago.

How can I use internal frames with buttons to call others internal frames?

Hello.
I'm building a MDI-application using JFrames and several JInternalFrames, but I have problems.
A JFrame has JMenuBar with JMenu and JMenuItem. One of these, call the first JInternal that has its interface. In this interface has a button that call other type (a class extension of JInternalFrame) JInternalFrame.
When I clicked button happen a exception (java.lang.NullPointer).
What happening?
Help me, please.

What i usually do is to give my desktop to my internal frames. So within the internalframe, you can use your desktop and add other internal frames to it.
The code should look something like the following.
desktop = your JDesktopPane
MyInternalFrame = an InternalFrame
AnotherMyInternalFrame = another InternalFrame
public class MyInternalFrame extends JInternalFrame implements ActionListener
private JButton jb = new JButton("Launch");
private JLayeredPane desktop = null;
public MyInternalFrame(JLayeredPane desktop)
    this.desktop = desktop;
    getContentPane().add(jb);
    jb.addActionListener(this);
public void actionPerformed(ActionEvent ae)
    if (ae.getSource() == jb)
      desktop.add(new AnotherMyInternalFrame(desktop),JLayeredPane.DEFAULT_LAYER);
}

How to make Internal Frame on Focus

Hi All,
i have an application where in i have a JInternalFrame within in A JFrame.
Queries:
1.I want to make JInternalFrame focused,(without clicking on any portoion of Internal Frame) once i run the apllication(java Demo)
2.i want to fix the JInternal Frame.(Non movable)
//Demo.java
import java.io.*;
import java.lang.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
public class Demo extends JFrame implements ActionListener {
static JDesktopPane desk;
String labelstr="Test ";
JPanel contentpane;
JLabel titlelabel;
public Demo() {
          setTitle("Swing Test");
                contentpane=(JPanel)getContentPane();
                contentpane.setLayout(new BorderLayout());
                desk=new JDesktopPane();
                desk.setBackground(Color.gray);
                contentpane.add("Center",desk);
                titlelabel=new JLabel(labelstr);
                titlelabel.setForeground(Color.black);
                titlelabel.setBorder(new BevelBorder(BevelBorder.LOWERED));
                getContentPane().add(titlelabel,BorderLayout.SOUTH);
          public void actionPerformed(ActionEvent e) {
             public static void main(String args[]) {
                try {
                  UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
                  //UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                 }catch(Exception e) {
                                           System.out.println("Error loading L&F:"+e);
                                           JOptionPane.showMessageDialog(null,e);
                JFrame frame=new Demo();
                frame.setSize(800,600);
                frame.setVisible(true);
                  InternalFr jif=new InternalFr();
                  jif.start();
                frame.addWindowListener(new CloseWindow());
     class CloseWindow extends WindowAdapter {
         public void windowClosing(WindowEvent we) {
             Window w=we.getWindow();
             w.dispose();
             System.exit(0);
      }//InternalFr.java
import java.io.*;
     import java.net.*;
     import java.lang.*;
     import java.awt.*;
     import java.awt.event.*;
     import javax.swing.*;
     import javax.swing.border.*;
     import javax.swing.text.*;
     public class InternalFr extends JInternalFrame {
         JLabel jlName, jlPass;
         static JTextField jtName,jtPass;
             JButton submit,cancel;
        public InternalFr() {
          super( "InternalFr");
          Icon img=new ImageIcon("Neticon.gif");
          setFrameIcon(img);
          JPanel contentpane=(JPanel)getContentPane();
           contentpane.setLayout(null);
          JPanel mainpanel=new JPanel();
          mainpanel.setLayout(null);
          mainpanel.setBounds(0,0,290,180);
          jlName=new JLabel("Username   :");
          jlName.setBounds(20,20,180,20);
          jlName.setForeground(Color.black);
          jtName=new JTextField();
          jtName.setBounds(150,20,100,20);
          mainpanel.add(jtName);
          mainpanel.add(jlName);
          jlPass=new JLabel("Password   :");
          jlPass.setBounds(20,50,180,20);
          jlPass.setForeground(Color.black);
          jtPass=new JTextField();
          jtPass.setBounds(150,50,100,20);
          mainpanel.add(jlPass);
          mainpanel.add(jtPass);
          JPanel buttonpanel=new JPanel();
          buttonpanel.setLayout(null);
          buttonpanel.setBounds(30,90,215,30);
          buttonpanel.setBorder(new EtchedBorder(EtchedBorder.RAISED));
          submit=new JButton("Submit");
          submit.setMnemonic('O');
          submit.setBounds(5,5,100,20);
          buttonpanel.add(submit);
          submit.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
             if(ae.getSource()==submit) {
        cancel=new JButton("Cancel");
          cancel.setMnemonic('C');
          cancel.setBounds(110,5,100,20);
          buttonpanel.add(cancel);
          cancel.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent ae) {
                  Object obj=ae.getSource();
                 if(obj==cancel){
                      System.exit(0);
       contentpane.add(buttonpanel);
       contentpane.add(mainpanel);
    public void start() {
         InternalFr at=new InternalFr();
         at.setSize(290,180);
        at.setLocation(220,150);
        at.setVisible(true);
        Demo.desk.add(at);
}Thanks
Mohan

To give focus to an internal frame, do the following (where iFrame is your internal frame):try {
    iFrame.setIcon( false ); // In case it is minimized
    iFrame.moveToFront();     // Make sure it is in front
    iFrame.requestFocus();    // Ask for focus
    iFrame.setSelected( true ); // Select it
} catch( java.beans.PropertyVetoException pve ) {
}

Visibilty of Internal frame in a parent JFrame when it maximize

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