How to make a JFrame Modal in Swing java

Question

I have created one GUI in which I have used a JFrame  How should I make it Modal

User · Accepted Answer

Your best bet is to use a JDialog instead of a JFrame if you want to make the window modal. Check out details on the introduction of the Modality API in Java 6 for info. There is also a tutorial.

Here is some sample code which will display a JPanel panel in a JDialog which is modal to Frame parentFrame. Except for the constructor, this follows the same pattern as opening a JFrame.

final JDialog frame = new JDialog(parentFrame, frameTitle, true);
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);

Edit: updated Modality API link & added tutorial link (nod to @spork for the bump).

User · Answer

This static utility method shows a modal JFrame by secretly opening a modal JDialog  too  I used this successfully and with proper behavior on Windows 7  8  and 10-with-multiple-desktops   It s a nice example for the very rarely used feature of local classes   import javax swing    import java awt Dialog  import java awt Dimension  import java awt Frame  import java awt event WindowAdapter  import java awt event WindowEvent           class declaration          Shows an already existing JFrame as if it were a modal JDialog  JFrames have the upside that they can be    maximized      lt p gt     A hidden modal JDialog is  shown  to effect the modality      lt p gt     When the JFrame is closed  this method s listener will pick up on that  close the modal JDialog  and remove the    listener        made by dreamspace-president com        param window the JFrame to be shown     param owner  the owner window  can be null      throws IllegalArgumentException if argument  window  is null     public static void showModalJFrame final JFrame window  final Frame owner         if  window    null            throw new IllegalArgumentException              window setModalExclusionType Dialog ModalExclusionType APPLICATION EXCLUDE       window setVisible true       window setAlwaysOnTop true        final JDialog hiddenDialogForModality   new JDialog owner  true       final class MyWindowCloseListener extends WindowAdapter            Override         public void windowClosed final WindowEvent e                window dispose                hiddenDialogForModality dispose                         final MyWindowCloseListener myWindowCloseListener   new MyWindowCloseListener        window addWindowListener myWindowCloseListener        final Dimension smallSize   new Dimension 80  80       hiddenDialogForModality setMinimumSize smallSize       hiddenDialogForModality setSize smallSize       hiddenDialogForModality setMaximumSize smallSize       hiddenDialogForModality setLocation -smallSize width   2  -smallSize height   2       hiddenDialogForModality setVisible true       window removeWindowListener myWindowCloseListener

User · Answer

If you re prepared to use a JDialog instead of a JFrame  you can set the ModalityType to APPLICATION MODAL   This provides identical behaviour to your typical JOptionPane   import java awt event ActionEvent  import javax swing    import java awt    import java awt event ActionListener   public class MyDialog extends JFrame    public MyDialog         setBounds 300  300  300  300       setDefaultCloseOperation JFrame EXIT ON CLOSE       setVisible true       setLayout new FlowLayout         JButton btn   new JButton  TEST        add btn       btn addActionListener new ActionListener                    Override         public void actionPerformed ActionEvent e                showDialog                         private void showDialog           JDialog dialog   new JDialog this  Dialog ModalityType APPLICATION MODAL         OR  you can do the following          JDialog dialog   new JDialog          dialog setModalityType Dialog ModalityType APPLICATION MODAL        dialog setBounds 350  350  200  200       dialog setVisible true      public static void main String   args         new MyDialog

User · Answer

As others mentioned  you could use JDialog  If you don t have access to the parent frame or you want to freeze the hole application just pass null as a parent   final JDialog frame   new JDialog  JFrame null  frameTitle  true   frame setModal true   frame getContentPane   add panel   frame setDefaultCloseOperation WindowConstants DISPOSE ON CLOSE   frame pack    frame setVisible true

User · Answer

Create a new JPanel form Add your desired components and code to it     YourJPanelForm stuff   new YourJPanelForm    JOptionPane showMessageDialog null stuff  Your title here bro  JOptionPane PLAIN MESSAGE      Your modal dialog awaits

User · Answer

There s a bit of code that might help   import java awt Component  import java awt event ActionEvent  import java awt event ActionListener  import java awt event WindowAdapter  import java awt event WindowEvent   import javax swing JFrame  import javax swing JMenu  import javax swing JMenuBar  import javax swing JMenuItem   public class ModalJFrame extends JFrame        Object currentWindow   this       public ModalJFrame                  super            super setTitle  Main JFrame            super setSize 500  500           super setResizable true           super setLocationRelativeTo null            JMenuBar menuBar   new JMenuBar            super setJMenuBar menuBar            JMenu fileMenu   new JMenu  File            JMenu editMenu   new JMenu  Edit             menuBar add fileMenu           menuBar add editMenu            JMenuItem newAction   new JMenuItem  New            JMenuItem openAction   new JMenuItem  Open            JMenuItem exitAction   new JMenuItem  Exit            JMenuItem cutAction   new JMenuItem  Cut            JMenuItem copyAction   new JMenuItem  Copy            JMenuItem pasteAction  new JMenuItem  Paste             fileMenu add newAction           fileMenu add openAction           fileMenu addSeparator            fileMenu add exitAction            editMenu add cutAction           editMenu add copyAction           editMenu addSeparator            editMenu add pasteAction            newAction addActionListener new ActionListener                         public void actionPerformed ActionEvent arg0                                 JFrame popupJFrame   new JFrame                     popupJFrame addWindowListener new WindowAdapter                                           public void windowClosing WindowEvent e                                                       Component  currentWindow  setEnabled true                                                                      Component  currentWindow  setEnabled false                   popupJFrame setTitle  Pop up JFrame                    popupJFrame setSize 400  500                   popupJFrame setAlwaysOnTop true                   popupJFrame setResizable false                   popupJFrame setLocationRelativeTo getRootPane                     popupJFrame setVisible true                   popupJFrame setDefaultCloseOperation JFrame HIDE ON CLOSE                                      exitAction addActionListener new ActionListener                         public void actionPerformed ActionEvent arg0                                System exit 0                                       public static void main String   args             ModalJFrame myWindow   new ModalJFrame            myWindow setDefaultCloseOperation JFrame EXIT ON CLOSE           myWindow setVisible true

User · Answer

The only code that have worked for me  childFrame setAlwaysOnTop true    This code should be called on the main parent frame before making the child modal frame visible  Your child modal frame should also have this code  parentFrame setFocusableWindowState false   this mainFrame setEnabled false

User · Answer

What I ve done in this case is  in the primary jframe that I want to keep visible  for example  a menu frame   I deselect the option focusableWindowState in the property window so It will be FALSE  Once that is done  the jframes I call don  t lose focus until I close them

User · Answer

You can create a class that is passed a reference to the parent JFrame and holds it in a JFrame variable  Then you can lock the frame that created your new frame    parentFrame disable       Some actions  parentFrame enable

User · Answer

not sure the contetns of your JFrame  if you ask some input from users  you can use JOptionPane  this also can set JFrame as modal              JFrame frame   new JFrame                String bigList     new String 30                for  int i   0  i  lt  bigList length  i                    bigList i    Integer toString i                              JOptionPane showInputDialog                      frame                        Select a item                         The List                        JOptionPane PLAIN MESSAGE                      null                      bigList                       none

User · Answer

As far as I know  JFrame cannot do Modal mode  Use JDialog instead and call setModalityType Dialog ModalityType type  to set it to be modal  or not modal

User · Answer

just replace JFrame to JDialog in class  public class MyDialog extends JFrame    delete JFrame and write JDialog   and then write setModal true   in constructor  After that you will be able to construct your Form in netbeans and the form becomes modal

User · Answer

The most simple way is to use pack   method before visualizing the JFrame object  here is an example   myFrame frm   new myFrame    frm pack    frm setVisible true

[java] How to make a JFrame Modal in Swing java

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