Maximizing JFrame on Linux OS

This is the same topic as in this thread
http://forum.java.sun.com/thread.jspa?threadID=734904&tstart=0
thanks

Dear Akshay,
When using a Linux OS, in transaction DC20 a separate frontend type and a path for processing originals in according with Linux OS specifications must be defined.
In addition, the users must then select this front end types before they display an original. They can do this in the "Extras" menu with the menu command "Change frontend type". For this change it is important that the "HOSTNAME" variable is maintained for the MAC computer. On Windows computers, you can maintain this in the system control panel. This HOSTNAME value is then entered for the new frontend types and in future the user should then always use the new frontend type.
Best regards,
Christoph

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Maximize undecorated JFrame on linux

Hello every one!
I have a problem with maximizing undecorated window on all Linux OS. When I try to maximize my jFrame, it maximized for all screen size and cover task bar.
How calculate screen bounds insets on linux? It's possible at all?
JFrame jFrame = new JFrame();
jFrame.setUndecorated(true);
jFrame.setExtendedState(MAXIMIZED_BOTH);
jFrame.setVisible(true);

Strange. I once had the opposite problem on Windows...
According to [this post|http://forums.sun.com/thread.jspa?messageID=10803082#10803082] , the following should return the size of the desktop screen, save for the task bar if any:
GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds()You could then explicitly set the frame's bounds to this value. However I would assume that's already what setExtendedState(MAXIMIZED_BOTH) does...
Edited by: jduprez on Apr 29, 2010 9:34 AM

Maximized JFrame obscuring task bar

I have an application that obscures the windows taskbar when it is maximized (using the JFrame's own maximize button - NOT programmatically). The same happens when this.setExtendedState(JFrame.MAXIMIZED_BOTH) is called.
J2SE 1.4.0 in windows 2000 is the environment (from what have read, maximize should work well in 1.4). I can create a brand new JFrame and mostly it works - is there some undocumented property that is causing it to maximize to the fullscreen instead of the usable screen?
Thanks in advance.

I was hoping that there was a way that made sure the JVM itself would do it (it works most of the time) - such a simple but important thing to end users should NOT require JNI code. Maximising on at least windows and macintosh (and most linux flavours) is pretty well defined - anyone that says it is a platform specific feature is just wrong - it can apply to any GUI system at least in some form.

Disable mouse or get fullscreen jframe in linux

I am trying to create a login screen that will grant a user access to a particular application. For the login screen, I would like the ability to make the jframe run at fullscreen. I am able to do this on windows, but can't duplicate it on ubuntu linux. Since I am unable to get the code below to work on linux, maybe someone knows another way to get the same effect, or would it be possible to turn off the use of the mouse, not only on the jframe, but on the system itself?
Thanks for the help.
public static void main(String[] args) {
// initialize the Graphic device to default one
        final GraphicsDevice myDevice = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
// create the frame
        final JFrame test = new JFrame("Login Screen");
// set recomended attributes
        test.setResizable(false);
        test.setUndecorated(true);
// test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // we don't really need this because no mouse close is provided
        test.addKeyListener(new KeyAdapter() {
            @Override
            public void keyReleased(KeyEvent e) {
                super.keyReleased(e);
// code to kill off other events such as ALT-F4 on windows should go here
// lets provide a way out for now
                if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
                    myDevice.setFullScreenWindow(null);
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                    System.exit(0);
       System.out.println("before full screen");
// query for supported
        if (myDevice.isFullScreenSupported()) {
            System.out.println("full screen supported");
            try {
                myDevice.setFullScreenWindow(test);
            } catch (Exception e) {
// if something goes wrong kill the window get back to desktop
                myDevice.setFullScreenWindow(null);
                e.printStackTrace();
    }

Hi,
I am not an expert and am trolling this site hoping to find the answer to my problem. However, I think that I might know the answer to this one.
Open a site that has a flash application in it (like a you tube video). Right click on the flash window, select settings, and click the check box that selects "Enable hardware acceleration". Doing this should improve the speed of video playback.
Of course, it has done nothing for me since upgrading to Flash version 10.1, but it might work better for you.
William

Maximized JFrame

Hello!
I'm wondering how can I launch JFrame already maximized ?
jdk1.3.1
I was told that in jdk1.4 there is special method for this operation.

Hello!
I'm wondering how can I launch JFrame already
maximized ?
jdk1.3.1
I was told that in jdk1.4 there is special method for
this operation.Not directly possible in 1.3.1. If you do a forum search you'll find two workarounds: via screensize and using robot.

Maximized Screen in Linux Java (GraphicsEnvironment)

How do I maximized my Frame in Linux Environment??? Since there is no GraphicsEnvironment class available... Please Help me in this problem...

Hi ,
I have checked this will not work on Linux.
i.e. the call
setMaximizedState(Frame.MAXIMIZED_BOTH);
does NOT work in Linux(RHEL 4.X).
Can you please help me how to achieve the "MaximizedScreen" during the coming up of the UI in Linux?
Thanks,
-Bhaskar.

Maximizing JFrames

I've been looking around the API and I haven't found a way to maximize a JFrame programmatically. The best I've done is figure out the screen size and setSize it, manually, but it's sill shows a maximize button. Anybody with any ideas? Or is this simply not possible?

Try using Toolkit...
Toolkit theKit = window.getToolkit();
Dimension wndSize = theKit.getScreenSize();
window.setSize(wndSize.width, wndSize.height);
where window is a JFrame object...
hope this helps...

JFrame (extended) state, iconified/maximized/normal question

Greetings and salutations,
I've been removing some rough edges from my last application and I noticed the
following: before an application quits every location/size of the top level components
is written to a file. When the application starts again everything is read back in
again and the application shows itself just as it was before it closed the last time.
There's one little quirck though:
A JFrame can be in one of three states when an application quits:
1) iconified; nothing is wrong here, i.e. the application comes back on in the same
iconified state and after de-iconification the JFrame shows up the same as
before the previous quiting.
2) 'normal': same as above: the JFrame shows up identical as before quiting
the application the previous time.
3) maximized: the new incarnation shows up as a maximized JFrame, but after
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the entire screen.
Before quiting I save the bounds, the state and the extended state of a JFrame
and reinstate these values after a new incarnation of the application. I think I've
tried all 2^3 == 8 possible permutations of this all, but option 3) keeps giving
me trouble, i.e. the bounds don't work after 'demaximalization'.
Ideas anyone?
kind regards,
Jos

Here's a test program for people who want to experiment around a bit, but are reluctant to create a test class:import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class Test extends JFrame {
    public Test () {
        setDefaultCloseOperation (WindowConstants.DISPOSE_ON_CLOSE);
        setTitle ("Test");
        WindowInfo windowInfo;
        try {
            windowInfo = read ();
        } catch (Exception exception) {
            System.err.println ("couldn't read window.info");
            windowInfo = new WindowInfo ();
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        setSize (windowInfo.size);
        setExtendedState (windowInfo.extendedState);
        addWindowListener (new WindowAdapter () {
            public void windowClosing (WindowEvent event) {
                try {
                    write (new WindowInfo (getLocation (), getSize (), getExtendedState ()));
                } catch (Exception exception) {
                    System.err.println ("couldn't write window.info");
        setVisible (true);
    public static void main (String... parameters) {
        new Test ();
    private WindowInfo read () throws ClassNotFoundException, IOException {
        ObjectInputStream in = null;
        try {
            in = new ObjectInputStream (new FileInputStream ("window.info"));
            return (WindowInfo) in.readObject ();
        } finally {
            if (in != null) {
                try {
                    in.close ();
                } catch (IOException exception) {}
    private void write (WindowInfo windowInfo) throws IOException {
        ObjectOutputStream out = null;
        try {
            out = new ObjectOutputStream (new FileOutputStream ("window.info"));
            out.writeObject (windowInfo);
        } finally {
            if (out != null) {
                try {
                    out.close ();
                } catch (IOException exception) {}
    private class WindowInfo implements Serializable {
        public Point location;
        public Dimension size;
        public int extendedState;
        public WindowInfo () {
            size = new Dimension (600, 400);
            Dimension screenSize = Toolkit.getDefaultToolkit ().getScreenSize ();
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        public WindowInfo (Point location, Dimension size, int extendedState) {
            this.location = location;
            this.size = size;
            this.extendedState = extendedState;
}Note that I fooled around myself a bit too.

Making components NOT resizable, forcing certain components to be resized

Basic setup -
A maximized JFrame with BorderLayout, a JPanel added to the contentPane in location BorderLayout.WEST, and another container in BorderLayout.EAST (not that it should matter much).
In the JPanel in the western side, I have it set up with a BoxLayout going down along the Y axis, and in order, I have a JPanel (with a few JLabels inside), a JPanel with a JLayeredPane that uses GridLayout, and a blank JPanel to fill up space (remember, the parent frame is maximized).
What happens is that my JPanel with the JLayeredPane gets stretched (and distorted) out to the bottom of the frame, when what I want is that the empty JPanel gets stretched and fills up the empty space.
Is there a way to "lock" the layered pane's size so that it doesn't get stretched? Which layout should I use, or how can I make the JPanel take up the empty space? I suppose I could set the empty panel's preferred height to Integer.MAX_VALUE, but that seems like a rather messy solution.
Also... sometimes when I click on the JLayeredPane (which is a gridlayout of JPanels) and I remove a component from one of the JPanels, the whole layout gets shifted over and really distorted (not stretched, but jumbled). I've narrowed the problem down to something to do with validation/revalidate. Would anyone happen to have an idea of what's going on?
Thanks

I had already tried using glue, but it did nothing so I switched over to the filler JPanel, but that obviously didn't help much, but wonderfully enough, once I set the JPanel with the JLayeredPane to have a FlowLayout instead of a BorderLayout, glue worked!
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Linux / Gnome - problem with moving JFrame ?

I have a swing application which runs fine on Windows. Yesterday I tried it on a Fedora Linux (latest version) with Gnome, running Java 1.5.0_02 and I noticed the following weird problem. When you try to drag a JFrame window by the title bar to move it, it always maximizes it! When you bring it back to regular size, you see that the window was actually moved, but after that it was maximized, as if you double-clicked the title bar. It only happens with Java windows, all other X11 applications behave normally.
Anybody else have the same problem?

Btw, it only happens if you specify that you want JFrame and JDialog decorated:
setDefaultLookAndFeelDecorated(true)
As much as I like the new 1.5 Swing decorations I guess I will have to stick to no decorations under Linux.

JFrame which does not allow resizing (maximizing, minimizng)

I want to develop a login frame which does not allow resizing (maximizing, minimizing as this does not make sense) and with 2 fields, JTextField and JPasswordField.
The frame is developed but has the usual resizing handles.
How to do?
Many tks for any information.
John Pashley

Don't use a JFrame. Also, don't expect code like this again; I did it for fun.
It requires your modification.
* Title: Login Screen
* Description: Login Screen
* Class: Login ScreenLoginScreen
* Copyright: who cares
* Company: who cares
* @author who cares
* @version who cares
import java.awt.*;
import java.awt.event.*;
import java.net.URL;
import java.util.Vector;
import java.io.File;
import javax.swing.*;
public class LoginScreen extends JDialog implements ActionListener, FocusListener
 private JTextField name;
 private JPasswordField password;
 private JButton loginButton;
 private JButton cancelButton;
 private JDialog thisDialog = this;
 private ImageIcon splashImage;
 private String appTitle;
 private int logCounter;
 public LoginScreen()
 super();
 this.toFront();
 setTitle("Login");
 addWindowListener(new WindowAdapter()
 public void windowClosing(WindowEvent e)
 System.exit(0);
 getContentPane().setLayout(new BorderLayout());
 splashImage = new ImageIcon( getClass().getResource("images" + File.separator + "image.jpg")) );
 getContentPane().add(new JLabel(splashImage), "North");
 getContentPane().add(makeLoginPanel(), "Center");
 getContentPane().add(makeButtonPanel(), "South");
 pack();
 setResizable(false);
 setLocationRelativeTo(null);
 setVisible(true);
 * make login panel
 private JPanel makeLoginPanel()
 JPanel loginPanel = new JPanel();
 JLabel label;
 loginPanel.setBorder(BorderFactory.createEmptyBorder(20, 20, 0, 20));
 GridBagLayout gbl = new GridBagLayout();
 GridBagConstraints gbc = new GridBagConstraints();
 loginPanel.setLayout(gbl);
 gbc.weightx = 1.0;
 gbc.fill = GridBagConstraints.HORIZONTAL;
 gbc.insets = new Insets(0, 5, 10, 5);
 gbc.gridx = 0;
 gbc.gridy = 0;
 label = new JLabel("Login Name:", SwingConstants.LEFT);
 gbl.setConstraints(label, gbc);
 loginPanel.add(label);
 gbc.gridx = 1;
 name = new JTextField("insider", 10);
 name.addFocusListener(this);
 gbl.setConstraints(name, gbc);
 loginPanel.add(name);
 gbc.gridx = 0;
 gbc.gridy = 1;
 label = new JLabel("Password:", SwingConstants.LEFT);
 gbl.setConstraints(label, gbc);
 loginPanel.add(label);
 gbc.gridx = 1;
 password = new JPasswordField("insider",10);
 password.addFocusListener(this);
 gbl.setConstraints(password, gbc);
 loginPanel.add(password);
 return loginPanel;
 * make button panel
 private JPanel makeButtonPanel()
 JPanel buttonPanel = new JPanel();
 buttonPanel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
 //make LogIn button
 loginButton = new JButton("Login");
 loginButton.setActionCommand("Login");
 buttonPanel.add(loginButton);
 rootPane.setDefaultButton(loginButton);
 loginButton.addActionListener(this);
 this.getRootPane().setDefaultButton(loginButton);
 //make Cancel button
 cancelButton = new JButton("Cancel");
 cancelButton.setActionCommand("Cancel");
 buttonPanel.add(cancelButton);
 cancelButton.addActionListener(this);
 this.addKeyListener(new KeyAdapter()
 public void keyReleased(KeyEvent e)
 if(e.getKeyCode() == KeyEvent.VK_ESCAPE)
 cancelButton.doClick();
 return buttonPanel;
 * Action handler for login and cancel buttons
 public void actionPerformed(ActionEvent e)
 JButton btn = (JButton) e.getSource();
 if (btn.getActionCommand().equals("Login"))
 // Because login() process happens before swing process (above),
 // force it to happen "later"
 SwingUtilities.invokeLater(new Runnable()
 public void run()
 login(); //create this method, okay?!
 else if (btn.getActionCommand().equals("Cancel"))
 System.exit(0);
 * Focus gained handler for username and password buttons
 public void focusGained(FocusEvent e)
 JTextField tf = (JTextField) e.getSource();
 tf.selectAll();
 * Focus lost handler for username and password buttons
 public void focusLost(FocusEvent e) {}
 private void showErrorMessage(String message, String header)
 JOptionPane.showMessageDialog(getContentPane(),
 message, header,
 JOptionPane.ERROR_MESSAGE);
 * This method controls the cursor for login window. If isWait is set to
 * true, dialog's cursor is set to Cursor.WAIT_CURSOR. If isWait is set
 * to false, the cursor is set ta Deafult.
 * While the window is in WAIT mode, this method will also disable Login
 * and Cancel buttons to ensure the user does not accidently request
 * a cancel while loging in or launching a second login.
 private void setWaitCursor(boolean isWait)
 /* In order to disable login and cancel buttons while logging in to the
 application, this method will temporarely change action commands and
 reset them when login process failed to give user another chance.
 Note: Disabling the buttons by calling setEnabled(false) did not work
 since login() method is called from an action event handler and the
 process will not be released to AWT until login method is complete.
 if (isWait)
 this.getGlassPane().setCursor(new Cursor(Cursor.WAIT_CURSOR));
 this.getGlassPane().setVisible(true);
 loginButton.setActionCommand("none");
 cancelButton.setActionCommand("none");
 else
 this.getGlassPane().setCursor(Cursor.getDefaultCursor());
 this.getGlassPane().setVisible(false);
 loginButton.setActionCommand("Login");
 cancelButton.setActionCommand("Cancel");
} //end loginscreen

How to bring a JFrame up maximized?

if you have a class like this:
public class myClass extends JFrame {
//some components
public myClass() {
//add some components
setVisible(true);
how can you make this JFrame to appear maximized?
SJG

There may be another way, but try this:
this.setSize(new Dimension((int)screenSize.getWidth(), (int)screenSize.getHeight() );

JFrame icon won't change in linux

In windows, I'm able to change my JFrame's icon with the setIconImage(Image) but doing the same thing on linux (Gnome) does nothing. Is this a bug or is there something else I need to do to change an icon in a JFrame?

In windows, I'm able to change my JFrame's iconwith
the setIconImage(Image) but doing the same thingon
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JFrame maximizing - non deterministic behaviour

Hi there,
I wonder why in the following code the componentResized Method gets a JFrame instance wthich's extended state is MAX_BOTH and the componentMoved Method NORMAL.
Does someone have an explanation or an work around for storing the last position of the JFrame (to store in preferences in order to load them again).
Here is a minimal example.
import javax.swing.JFrame;
* @author Karlheinz Toni
public class Test {
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             * (non-Javadoc)
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             * (non-Javadoc)
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}I would be greatful to any help ;)
Sincerely
Charly

I was playing with exactly this kind of thing last night and discovered that the order you get the events isn't really guaranteed. I solved this by using a swing Timer to wait for 1 second of inactivity before querying the Frame and updating the user preferences. Here's the chopped down version of my code:
I register a GeometryTracker object as a ComponentListener and a WindowStateListener in the frame to be monitored.
This all seems to work quite well, but I'm still seeing differences between windows and OS-X for example. (on OS-X the maximized state doesn't seem to correlate with reality. If anyone knows of a trick I'd love to see it.
Thanks and I hope this helps!
Cheers,
Seve
import javax.swing.Timer;
public class GeometryTracker
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    private Preferences framePrefs;
    private int         frameState = 0;
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    private Timer       updateTimer;
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Jframe titlebar is not visible on linux.

Hi all,
I am developing a GUI application in java for Linux platform. And while i execute my code on linux then the title bar (which contains information about page in left and minimize,maximize and close button in right) is not visible. While it is visible when i put the same code on windows.
On linux Jinternal frame instance is showing title bar but Jframe instace is not and that is a problem for my main GUI window.
Please help me how to make titlebar visible on linux or what i am doing wrong.
Thanks in advance.
Note: I am accesing linux terminal thrugh Xstart(An xterm based interface).
Edited by: Mavens on May 20, 2008 9:09 AM

Can you test whether the display is the same on a Linux box accessed directly (rather than through the remote client)?
Can you post sample code? Details about your flavor, window manager, etc.?

Maximizing JFrame on Linux OS

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