Close JFrame

hi all,
i have a JFrame. on that frame i put a JTabbedPane. on this pane i add a JPanel. and on this panel there is a JButton "exit". when this button is clicked, a JDialog opens that asks the user if he really wants to quit. when the user clicks "yes", i would like the frame to close, without using the System.exit() command (since the frame is opened from another JFrame, and that one isn't supposed to shut down).
does any of you know how to do that? thanks a lot people!

thanks woodi,
i know that i could use these methods, but the problem is i cannot tell the program which frame to close; since i'm using:
JFrame --> JTabbedPane --> JPanel --> JButton --> JDialog
how to tell the JDialog that i want to distroy the JFrame?

Similar Messages

Close JFrame by press JButton

i wonder how to close JFrame...
i know that DeafultCloseOperation... to this for me by pressing X...
but how can i close the JFrame by pressing JButton...
what do i have to do?
to create new Event to do this or what?
thx
cya

You can just call dispose();
             btnClose.addActionListener(
                        new ActionListener()
                               // pass query to tthe frame
                             public void actionPerformed( ActionEvent event )
                                 dispose();
                             } // end actionPerformed
                         } // end ActionListener inner class
                      ); // end call to addActionListener

Question on not to close JFrame when close button is clicked

Hi All,
Good Morning
I have frame created like:
JFrame frame=new JFrame();When we give
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);The above statement closes the frame but i want the same frame to be hidden in the statusbar.So can any one help me in providing any built in method if there or else how to do it??
Thanks in advance.
regards,
Viswanadh

but i want the same frame to be hidden in the statusbar.Thats what the "minimize" button is for. Don't mix the functionality of the two buttons.

To close JFrame over a JDialog

Hi,
I am facing a slight problem. Say I have a code like under
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class abc extends JDialog implements ActionListener
     JPanel jp1 = new JPanel();
     JButton ok1 = new JButton("OK");
     public abc()
          this.getContentPane().setLayout(new BorderLayout());
          this.getContentPane().add(jp1,BorderLayout.CENTER);
          jp1.add(ok1);
          ok1.addActionListener(this);
          ok1.setActionCommand("ok1");
     public void actionPerformed(ActionEvent e)
          if (e.getActionCommand().equals("ok"))
               System.out.println("Inside action performed method");
          else if (e.getActionCommand().equals("ok1"))
          JFrame j1 = new JFrame();
          JPanel jp2 = new JPanel();
          JButton btn1 = new JButton("OK");
          j1.getContentPane().add(jp2);
          jp2.add(btn1);
          btn1.addActionListener(this);
          btn1.setActionCommand("ok");
          j1.show();
          j1.pack();
          j1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
public static void main(String args[])
          abc ABC = new abc();
          ABC.show();
          ABC.pack();
Now here in this code the line
j1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
closes the application itself. What I want is only the JFrame closes while the main Dialog stills stays in context.
Can someone help with me how I can achieve the same.
Regards.
Anand

There is a dialog it has a OK button. When I click the OK button a frame opens with another OK1 button in it.
Now if I click the "x" sign of the frame it should be disposed without doing anything. frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE)But if I click the OK1 button then also the frame should be disposed but
after doing something other processing corresponding to the OK1 button.
OK1.addActionListener( new ActionListener() {
    public void actionPerformed(ActionEvent e) {
          // do processing
         frame.setVisible(false);
         // add this if you want to remove the frame from memory and recreate it when it needs to be opened
         frame.dispose();
})>
And within all this the parent(JDialog) and the child(JFrame) should be modal.A JFrame unfortunately cannot be modal, so you shd use a JDialog instead.
ICE

Close JFrame in Netbeans

Hello,
I have a java application in NetBeans. I have been using Netbean absolut layout. I didn´t create JFrame class variable at all, instead using:Ok is a button
ok.setFont(new java.awt.Font("Arial", 0, 10));
ok.setToolTipText("ok");
ok.setLabel("ok");
ok.setMargin(new java.awt.Insets(2, 2, 2, 2));
getContentPane().add(ok, new org.netbeans.lib.awtextra.AbsoluteConstraints(160, 150, 60, 20));
ok.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
okPerformed(evt);
I don´t want to use System.exit(0); because it will shut down whole system. In order to use dispose method, I created a JFrame class variable in beginning of the class, but it doesn´t work.
JFrame frame = new JFrame();
public void okPerformed (java.awt.event.ActionEvent evt){
this.frame.dispose();
Can anyone help me?
Thanks

hello,
Thanks for replying my message so fast.
I tried, but it still doesn´t work. I am using netbeans absolute Layout. It doesn´t really have frame. Here is my code
public class tt extends JFrame{
JFrame frame = new JFrame();
JTextField text1= new JTextField(20);
JButton ok = new JButton();
public tt throws Exception
setSize(400,300);
setTitle("tt");
getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
text1.setFont(new java.awt.Font("Arial",0,12));
text1.setBounds(5, 8, 5, 5);
text1.setEditable(true);
getContentPane().add(text1, new org.netbeans.lib.awtextra.AbsoluteConstraints(230, 30, 100, 20));
ok.setFont(new java.awt.Font("Arial", 0, 10));
ok.setToolTipText("ok");
ok.setLabel("ok");
ok.setMargin(new java.awt.Insets(2, 2, 2, 2));
getContentPane().add(ok, new org.netbeans.lib.awtextra.AbsoluteConstraints(160, 150, 60, 20));
ok.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
okPerformed(evt);
setVisible(true);
public void okPerformed (java.awt.event.ActionEvent evt){
setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
Thanks

Algo and close JFrame question

Just a question. Basically, this is just my main method:
    public static void main(String[] args) {
        //Launch window ==============================================
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                game.launchFrame();
        //============================================================
    }It launches the frame of my game, which is a domino game. There's a bunch of code there (done), and at the end of a game, it asks whether the user wants to play another game, or quit the program. Quitting the program means just using System.exit(0).
But what about if the user wants to play another game? I was thinking to just close the frame and launch another one. So I put "isEnd = true" if the user wants another game, and modified the main method:
        while (isEnd == false){
        //Launch window ==============================================
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                game.launchFrame();
        //============================================================
        }But it's totally flawed. It repeatedly tries to launch the same frame, so it's messy as hell.
What do you guys suggest so the program can start a new game?

so...
we have the frame -> "DominoFrame.java"
we have the GUI builder -> "MyDominoGUIBuilder.java"
we have the class for storing domino -> "DominoStorage.java"
and the Domino classes -> "DominoSet.java" , "Domino.java", etc...
when you launch the app in DominoFrame, MyDominoGUIBuilder uses a new DominoStorage
to initialize and manage the Domino game...
when you wanna start a new game, you can "destroy" the DominoStorage and creating
a new one and call the MyDominoGUIBuilder to create a new game, etc...

Questions about close a JFrame

1) Creat a new JFrame frm1 to show a login page
2) when user entered username & password, and clicked "OK" button, the program will check it's authority. when passed, I want to open a new JFrame and close the login frame.
but I couldn't close the login page, and i found nothing on close JFrame on JFrame's API, except
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
maybe the usage about JFrame totally wrong. please give me some help. thank you!

Hy
On clicking the Login Button, u should validate the authorization.
Eg:- If authorisation success then 1 , else 0.
so if 1 means.
this.dispose();
newFrame.setVisible(true);
if authorization 0 means,
show some message using JOptionPane.showMessageDialog(...);
and let the cursor be in the first field.

JFrame opening multiple times - strange bug

Hi there
I'm having this problem whereby a window (a JFrame) is opened multiple times - it works as follows:
- I've got one JFrame which is opened via a button in my main JFrame (I'll call it JFrame 1)
- A second one is opened from within the first in a similar way (JFrame 2)
- The first time one opens JFrame 1 one can open and close JFrame 2 fine as many times as one wants
- But when one closes JFrame 1 (this with JFrame 2 closed) and then reopens it (JFrame 1) and then clicks the button to open JFrame 2, JFrame 2 then opens twice - except one of them contains no components while the other contains everything it is meant to
- The same thing happens as many times as I close JFrame 1 - except that when it is closed again JFrame 2 opens 3 times, then 4 and so on
This is what I have for JFrame 1 (the actionlistener in the main window just calls showDebateRound(int roundID):
public void showDebateRound(int roundID) {
        JFrame roundWindow=new JFrame("Round Draw");
        roundWindow.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        showRoundTitle.setFont(new java.awt.Font("Dialog", 1, 18));
        showRoundText.setColumns(20);
        showRoundText.setEditable(false);
        showRoundText.setRows(5);
        showRoundScroller.setViewportView(showRoundText);
        //showRoundPrint.setEnabled(false);
        //work out the title
        showRoundTitle.setText("Round: "+getRoundTitle(roundID));
        //work out the draw output
        showRoundTexts = "Motion: "+round[roundID].getMotion()+"\n\n";
        for (int i=0;i<debateCount;i++) {
            if (debate.getRoundID()==roundID) {
showRoundTexts=showRoundTexts+"Prop: "+team[debate[i].getTeamOneID()].getTeamName()+"\nOpp: "+team[debate[i].getTeamTwoID()].getTeamName()+"\n\n";
showRoundText.setText(showRoundTexts);
//layout
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(roundWindow.getContentPane());
roundWindow.getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(showRoundScroller, javax.swing.GroupLayout.DEFAULT_SIZE, 410, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(showRoundTitle)
.addComponent(showRoundDrawLabel))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 78, Short.MAX_VALUE)
.addComponent(showRoundPrint)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(ShowRoundEnterResults)))
.addContainerGap())
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(showRoundTitle)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(showRoundDrawLabel))
.addGroup(layout.createSequentialGroup()
.addGap(31, 31, 31)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(ShowRoundEnterResults)
.addComponent(showRoundPrint))))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(showRoundScroller, javax.swing.GroupLayout.DEFAULT_SIZE, 226, Short.MAX_VALUE)
.addContainerGap())
roundWindow.pack();
roundWindow.setVisible(true);
//debate round only actionlisteners
ShowRoundEnterResults.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
enterResults();
}JFrame 2 is constructed in the same way as JFrame 1
Does anyone have any idea why this could be happening? I can post more code if need be. Thanks.

hiding the form is probably more efficient than creating a new one each timeI rather think OP's both hiding the form and creating a new one each time.
I would really like to know why it is not workingYeah, so would I.But where's the code that brings up the second JFrame? the actionListener.actionPerformed of the button that opens it?
Better still, post a SSCCE limited to the minimum code that shows the problem.
{color:#0000ff}http://homepage1.nifty.com/algafield/sscce.html{color}
db

How to stop threads, process, streams when closing a (internal) JFrame?

Dear all,
I read a Javaworld article about Runtime.exec(), which will output the process outputs and error outputs to either a file or System.out. Now I want to practice it by outputing the process output/error to a Swing JTextArea. It works fine if the process ends successfully.
My problem is that I want to stop all the output threads and clear all the streams when user click close JFrame button before the process finished. The code is shown below. Note that this frame is poped up by a click from another main frame. ( it is not exiting the main Swing application). This happened when I want to kill a process when it is running.
I tried to implements a WindowListener and add
public void windowClosing(WindowEvent e) to the JFrame.
Inside this method I used process.destroy() and errorGobbler = null, outputGobbler = null, or outputGobbler.interrupt(), errorGobbler.interrupt(). But all these seems does not work. Sometimes thread was not stopped, sometimes process was not destroyed (because the stream was still print out something), sometimes the error stream was not successfully closed - by printing out interruptted by user error message.
How can I make sure all the underlying streams and threads, including the PrintStream in StreamGobbler class are closed?
Again this Frame could be a Dialog or InternalFrame, i.e, when I close the frame, the main frame does not exit!
import java.util.*;
import java.io.*;
class StreamGobbler extends Thread
    InputStream is;
    String type;
    OutputStream os;
    StreamGobbler(InputStream is, String type, JTextArea out)
        this(is, type, null, out);
    StreamGobbler(InputStream is, String type, OutputStream redirect, JTextArea out)
        this.is = is;
        this.type = type;
        this.os = redirect;
    public void run()
        try
            PrintWriter pw = null;
            if (os != null)
                pw = new PrintWriter(os);
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            String line=null;
            while ( (line = br.readLine()) != null)
                if (pw != null)
                    pw.println(line);
                out.append(type + ">" + line);
            if (pw != null)
                pw.flush();
        } catch (IOException ioe)
            ioe.printStackTrace();
public class Test extends JFrame
    private JTextArea output;
    private StreamGobbler outputGobbler;
    private StreamGobbler errorGobbler;
    public Test (String file)
        super();
        output = new JTextArea();
        try
            FileOutputStream fos = new FileOutputStream(file);
            Runtime rt = Runtime.getRuntime();
            Process proc = rt.exec("java jecho 'Hello World'");
            errorGobbler = new
                StreamGobbler(proc.getErrorStream(), "ERROR", out);
            outputGobbler = new
                StreamGobbler(proc.getInputStream(), "OUTPUT", fos, out);
            errorGobbler.start();
            outputGobbler.start();
            int exitVal = proc.waitFor();
            output.append("ExitValue: " + exitVal);
            fos.flush();
            fos.close();
        } catch (Throwable t)
            t.printStackTrace();
     setSize(400,400);
     show();
}Thanks !

Thread.interrupt() doesn't stop a thread. You'll have to read the API for more specifics. You could use something like interrupt to force interruption of the thread for the reason of checking the terminating case though. I believe you would want to use this in the case where operations can take a long time.
Setting your reference to the thread to be null won't stop the thread since it's running. You just lose your reference to it.
I believe once the thread stops running your streams will be closed, but possibly not cleanly. Someone who has more knowledge of threads might be able to answer this better, but I would generally say clean up after yourself especially if you are writting out data.

Trying to pass and object variable to a method

I have yet another question. I'm trying to display my output in succession using a next button. The button works and I get what I want using test results, however what I really want to do is pass it a variable instead of using a set number.
I want to be able to pass the object variables myProduct, myOfficeSupplies, and maxNumber to method actionPerformed so they can be in-turn passed to the displayResults method which is called in the actionPerformed method. Since there is no direct call to actionPerformed because it is called within one of the built in methods, I can't tell it to receive and pass those variables. Is there a way to do it without having to pass them through the built-in methods?
import javax.swing.JToolBar;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import java.net.URL;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Panel extends JPanel implements ActionListener
     protected JTextArea myTextArea;
     protected String newline = "\n";
     static final private String FIRST = "first";
     static final private String PREVIOUS = "previous";
     static final private String NEXT = "next";
     public Panel( Product myProduct, OfficeSupplies myOfficeSupplies, int maxNumber )
             super(new BorderLayout());
          int counter = 0;
             //Create the toolbar.
             JToolBar myToolBar = new JToolBar( "Still draggable" );
             addButtons( myToolBar );
             //Create the text area used for output.
             myTextArea = new JTextArea( 450, 190 );
             myTextArea.setEditable( false );
             JScrollPane scrollPane = new JScrollPane( myTextArea );
             //Lay out the main panel.
             setPreferredSize(new Dimension( 450, 190 ));
             add( myToolBar, BorderLayout.PAGE_START );
             add( scrollPane, BorderLayout.CENTER );
          myTextArea.setText( packageData( myProduct, myOfficeSupplies, counter ) );
          setCounter( counter );
     } // End Constructor
     protected void addButtons( JToolBar myToolBar )
             JButton myButton = null;
             //first button
             myButton = makeNavigationButton( FIRST, "Display first record", "First" );
             myToolBar.add(myButton);
             //second button
             myButton = makeNavigationButton( PREVIOUS, "Display previous record", "Previous" );
             myToolBar.add(myButton);
             //third button
             myButton = makeNavigationButton( NEXT, "Display next record", "Next" );
             myToolBar.add(myButton);
     } //End method addButtons
     protected JButton makeNavigationButton( String actionCommand, String toolTipText, String altText )
             //Create and initialize the button.
             JButton myButton = new JButton();
                 myButton.setActionCommand( actionCommand );
             myButton.setToolTipText( toolTipText );
             myButton.addActionListener( this );
               myButton.setText( altText );
             return myButton;
     } // End makeNavigationButton method
         public void actionPerformed( ActionEvent e )
             String cmd = e.getActionCommand();
             // Handle each button.
          if (FIRST.equals(cmd))
          { // first button clicked
                      int counter = 0;
               setCounter( counter );
             else if (PREVIOUS.equals(cmd))
          { // second button clicked
               counter = getCounter();
                  if ( counter == 0 )
                    counter = 5; // 5 would be replaced with variable maxNumber
                    setCounter( counter );
               else
                    counter = getCounter() - 1;
                    setCounter( counter );
          else if (NEXT.equals(cmd))
          { // third button clicked
               counter = getCounter();
               if ( counter == 5 ) // 5 would be replaced with variable maxNumber
                    counter = 0;
                    setCounter( counter );
                  else
                    counter = getCounter() + 1;
                    setCounter( counter );
             displayResult( counter );
     } // End method actionPerformed
     private int counter;
     public void setCounter( int number ) // Declare setCounter method
          counter = number; // stores the counter
     } // End setCounter method
     public int getCounter() // Declares getCounter method
          return counter;
     } // End method getCounter
     protected void displayResult( int counter )
          //Test statement
//                 myTextArea.setText( String.format( "%d", counter ) );
          // How can I carry the myProduct and myOfficeSupplies variables into this method?
          myTextArea.setText( packageData( product, officeSupplies, counter ) );
             myTextArea.setCaretPosition(myTextArea.getDocument().getLength());
         } // End method displayResult
     * Create the GUI and show it. For thread safety,
     * this method should be invoked from the
     * event dispatch thread.
     public void createAndShowGUI( Product myProduct, OfficeSupplies myOfficeSupplies, int maxNumber )
             //Create and set up the window.
             JFrame frame = new JFrame("Products");
             frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
             //Add content to the window.
             frame.add(new Panel( myProduct, myOfficeSupplies, maxNumber ));
             //Display the window.
             frame.pack();
             frame.setVisible( true );
         } // End method createAndShowGUI
     public void displayData( Product myProduct, OfficeSupplies myOfficeSupplies, int maxNumber )
          JTextArea myTextArea = new JTextArea(); // textarea to display output
          JFrame JFrame = new JFrame( "Products" );
          // For loop to display data array in a single Window
          for ( int counter = 0; counter < maxNumber; counter++ ) // Loop for displaying each product
               myTextArea.append( packageData( myProduct, myOfficeSupplies, counter ) + "\n\n" );
               JFrame.add( myTextArea ); // add textarea to JFrame
          } // End For Loop
          JScrollPane scrollPane = new JScrollPane( myTextArea ); //Creates the JScrollPane
          JFrame.setPreferredSize(new Dimension(350, 170)); // Sets the pane size
          JFrame.add(scrollPane, BorderLayout.CENTER); // adds scrollpane to JFrame
          JFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); // Sets program to exit on close
          JFrame.setSize( 350, 170 ); // set frame size
          JFrame.setVisible( true ); // display frame
     } // End method displayData
     public String packageData( Product myProduct, OfficeSupplies myOfficeSupplies, int counter ) // Method for formatting output
          return String.format( "%s: %d\n%s: %s\n%s: %s\n%s: %s\n%s: $%.2f\n%s: $%.2f\n%s: $%.2f\n%s: $%.2f",
          "Product Number", myOfficeSupplies.getProductNumber( counter ),
          "Product Name", myOfficeSupplies.getProductName( counter ),
          "Product Brand",myProduct.getProductBrand( counter ),
          "Number of Units in stock", myOfficeSupplies.getNumberUnits( counter ),
          "Price per Unit", myOfficeSupplies.getUnitPrice( counter ),
          "Total Value of Item in Stock is", myOfficeSupplies.getProductValue( counter ),
          "Restock charge for this product is", myProduct.restockingFee( myOfficeSupplies.getProductValue( counter ) ),
          "Total Value of Inventory plus restocking fee", myOfficeSupplies.getProductValue( counter )+
               myProduct.restockingFee( myOfficeSupplies.getProductValue( counter ) ) );
     } // end method packageData
} //End Class Panel

multarnc wrote:
My instructor has not been very forthcoming with assistance to her students leaving us to figure it out on our own.Aren't they all the same! Makes one wonder why they are called instructors. <sarcasm/>
Of course it's highly likely that enough information was imparted for any sincere, reasonably intelligent student to actually figure it out, and learn the subject in the process.
And if everything were spoonfed, how would one grade the performance of the students? Have them recite from memory
public class HelloWorld left-brace
indent public static void main left-parenthesis String left-bracket right-bracket args right-parenthesis left-brace
And everywhere that Mary went
The lamb was sure to go
db

Create button to implement windowClosed event

I am wondering if it is possible to create a button on a forum that would act the same as the X button in the window.
or if there is another way that i can let my parent frame, that created this new frame, know that the child frame has been closed so that the parent frame can carry on as normal until the next child frame is created.

ok, i don't think i made my issue clear, but i might be designing this a poor way so let me know.
my parent frame creates another frame, and listens for it to close
        JFrame edit;
        if ( frame not open ) {
            edit = new Edit_Applicator("Edit Applicator",380, 500, true);
            edit.setAlwaysOnTop(true);
            edit.addWindowListener(new java.awt.event.WindowAdapter() {
                public void windowClosed(WindowEvent winEvt) {
                    do thing;
        }then when i close the child i want it to be able to tell the parent that it has closed. if they click on the X my current method works perfect. however, i want to create an exit button on the child frame that will let the parent frame know it has closed as well.
i have created the button and the actionlistener for the button, but i'm not sure how to get the button to close the same way that the X button closes the frame, and have the windowlistener in the parent "hear" that the child closed.

Swing to Xml

Hi to all...
Is there any tool is available for Xml to Java for constructing GUI design in XML.
That is
GUI generating engine for Java applications. Graphical User Interfaces are described in XML documents that are parsed at runtime and rendered into javax.swing objects.

Post a small example program demonstrating your problem. The following demo works for me.
import java.awt.*;
import java.beans.*;
import java.io.*;
import javax.swing.*;
public class MyPanel extends JPanel {
    public MyPanel() {
        add(new JLabel("this is a test"));
    public static void main(String[] args) throws IOException {
        MyPanel panel = new MyPanel();
        File file = new File("Test.xml");
        XMLEncoder e = new XMLEncoder(new BufferedOutputStream(new FileOutputStream(file)));
        e.writeObject(panel);
        e.close();
        XMLDecoder d = new XMLDecoder(new BufferedInputStream(new FileInputStream(file)));
        Object result = d.readObject();
        d.close();
        JFrame f = new JFrame("Test");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add((Component) result);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
}On a separate note, why create a JPanel subclass if you aren't overriding any methods?

How can I stop a JFrame from closing when clicking the close button.

I need to display a dialog when a user attempts to close my app, giving them the option to close, minimize or cancel. How can I stop the form from closing after the user makes his selection? I have the folllowing code, but my form still closes after selecting an option:
private void formWindowClosing(java.awt.event.WindowEvent evt) {
        //An array of Strings to be used a buttons in a JOptionDialog
        String[] options = {"Close", "Minimize", "Cancel"};
        //Determines what the user wants to do
        int result = JOptionPane.showOptionDialog(null, "What to you want to do? Close the application, minimize or cancel?", "Please select an option...", 0, JOptionPane.QUESTION_MESSAGE, null, options, options[0]);
       //Determines what to do, depending on the user's choice
        if (result == 0) {
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        } else if (result == 1) {
            //Minimize the application
            this.setState(Frame.ICONIFIED);
    }Any help would be much appreciated!

import java.awt.event.*;
import javax.swing.*;
public class test extends JFrame {
     public static void main( String[] args ) {
          new test();
     public test() {
          setSize( 200, 200 );
          //the next line makes the JFrame not close
          setDefaultCloseOperation( JFrame.DO_NOTHING_ON_CLOSE );
          //now add a listener that does the trick
          addWindowListener( new WindowAdapter() {
                    public void windowClosing( WindowEvent e ) {
                         //ask the user and do whatever you wish
          setVisible( true );
}

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How do I close a JFrame using a JButton to trigger the event? I want to dispose of the frame.
thanks

I think this peace of code should do it for you:
public class MyFrame extends JFrame{
private MyFrame() {
this.setTitle("MyFrame");
Container contentPane = this.getContentPane();
contentPane.setLayout(new BorderLayout());
// Close the application using a JButton.
JButton closeButton = new JButton("Close");
closeButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
System.exit(0);
contentPane.add(closeButton, BorderLayout.SOUTH);
// Close the application using the JFrame.
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);

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how can i disable the close and minimize button of the Jframe?

to disable minimize
setResizeable(false);
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setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

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