Swing program execution flow

Hi,
I'm writing a Java program using Swing components.
In a part of this program I call a method that opens a window.
main
codeA
openWindowMethod();
codeB
Is there a way to stop codeB until window opened with openWindowMethod has been closed?
I don't want icodeB to start before I have closed window opened with openWindowMethod()!
Thanx

Check javax.swing.JDialog
If used correctly will block untill it is closed:
javax.swing.JDialog diag = new javax.swing.JDialog(someFrame, someTitle, true);
diag.setLocationRelativeTo(null);
diag.setVisible(true);By setting modal=true processing will block awaiting this dialog's demise.....
You can add a JPanel with various buttons, options etc to the dialog prior to showing...
NB! If you are looking to catch events on the dialog, add ActionListeners etc PRIOR to the
setVisible() call......
:)

Similar Messages

Program execution during RIMODAC2..will it always reach to cif user exit

Hello ,
We are implementing cif user exit for Purchase Order at R3 side to capture additional date field. So logic to capture additional date field is put in user exit CIFPUR01. We have RIMODAC2 background job for Purchase order running on daily basis.
if there is no change in standard Purchase Order objects. When RIMODAC2 is executed for purchase order Integration models ..will program execution still always reach to R3 user exit part of the program irrespective of if any change in standard purchase order object has happened or not.
Will appreciate your answer.
Thank you
Best Regards
Nilesh Patil

Nilesh,
I am no longer sure I understand the question.
RIMODAC2 activates the model. Once a model is activated, if someone changes certain specific fields in an R/3 object, then these changes are sent to SCM, either immediately or via change pointers. All this happens irrespective of IM userexits.
If this same field in this same object is changed in R/3, and a userexit also has been implemented, the userexit will execute according to its design, performing whatever task it has been programmed to do.
If you create and implement a userexit, it begins working at that moment in time that it is installed. Data that flowed across 'yesterday' to SCM is not affected. Data that flows across 'tomorrow' will be affected. Data in R/3 will usually only flow across to SCM if there is some kind of triggering event, usually a database 'change' transaction (e.g., ME22N for POs) The mere act of installing a userexit will not generally affect existing data on either side. The userexit only affects data that flows across the IM. Unchanged records in the R/3 database will generally not be sent to SCM by the IM, and will not be subject to userexit processing.
It is not generally the responsibility of a functional consultant to explain the workings of a userexit to a technical consultant. It is enough that the functional identifies the userexit, and specifies the business requirement in as much detail as possible. The developer is then responsible for carrying out the coding. Technicals are generally expected to be competent enough to determine from the userexit docs, and from the surrounding code, how a userexit works. They can also raise a message to SAP. In the end, it is all just ABAP, although userexit implementations can be quite challenging. SAP seldom provides enough details in their documentation. Once the Technical has finalized the code, Functional and Technical together then perform unit testing, before passing the mods to users for integration testing.
If your client's coders are unable to manage the task, perhaps they should engage your company to provide technical expertise, as well as functional expertise.
Best Regards,
DB49

Interrupting program execution

Hello, I want to interrupt/stop my program execution when a certain button is clicked. I want to implement the cancellation button in another GUI which is independent of the parent GUI that contains my running thread. However, when i invoke "Thread.currentThread().interrupt()" to cancel, it doesn't seem to work, and neither does "Thread.currentThread().stop()" of which I understand stop is deprecated. Any help will be appreciated.

call setEnabled(false) on the enclosing window. Maybe I'm over-simplifying things, but it could work in certain situations. For e.g.,
import java.awt.BorderLayout;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class SetEnabledTest {
private static void createAndShowUI() {
    final WindowOne winOne = new WindowOne();
    JFrame frame = new JFrame("SetEnabledTest");
    frame.getContentPane().add(winOne.getMainPanel());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
public static void main(String[] args) {
    java.awt.EventQueue.invokeLater(new Runnable() {
      public void run() {
        createAndShowUI();
class WindowOne {
private static final String DISABLED = "Disabled";
private static final String DISABLE = "Disable for 5 seconds";
protected static final int DISABLE_TIME = 5000;
private JPanel mainPanel = new JPanel();
private JButton controllerBtn = new JButton(DISABLE);
public WindowOne() {
    controllerBtn.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        final Window win = SwingUtilities.getWindowAncestor(mainPanel);
        if (controllerBtn.getText().equals(DISABLE)) {
          controllerBtn.setText(DISABLED);
          win.setEnabled(false);
          new Timer(DISABLE_TIME, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
              win.setEnabled(true);
              controllerBtn.setText(DISABLE);
              ((Timer)e.getSource()).stop();
          }).start();
    JPanel bottomPanel = new JPanel();
    bottomPanel.add(controllerBtn);
    JPanel topPanel = new JPanel();
    topPanel.add(new JTextField(10));
    topPanel.add(new JButton("Button"));
    mainPanel.setLayout(new BorderLayout());
    mainPanel.add(topPanel, BorderLayout.NORTH);
    mainPanel.add(bottomPanel, BorderLayout.SOUTH);
public void setEnabled(boolean enabled) {
    Window win = SwingUtilities.getWindowAncestor(mainPanel);
    win.setEnabled(enabled);
public JPanel getMainPanel() {
    return mainPanel;
}Edited by: Encephalopathic on Mar 12, 2010 3:11 PM

Keyboard-lock of swing program on Linux box

We are developing swing program on Linux, and we often meet keyboard-lock issues.
I try to simplify some of them to small programs, and still meet keyboard-lock.
Here I post two programs to show the error:
//---first ----------------------------------------------
package test;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class KeyLock extends JFrame {
JPanel contentPanel = new JPanel();
JPanel wizardToolPan = new JPanel();
JButton btnBack = new JButton("Back");
JButton btnNext = new JButton("Next");
JButton btnAbout = new JButton("About");
public static final String aboutMsg =
 "<html> This program will help to find keyboard lock problems, two way to reproduce: " +
 "1 - press Alt+N to navigate next, and don't release keys untill there are no more next page, " +
 "then try Alt+B to navigate back and also don't release keys untill page 0, " +
 "repeat Alt+N and Alt+B again and again, keyboard will be locked during navigating. " +
 "2 - press Alt+A in main window, it will popup an about dialog, " +
 "then press down space key and don't release, " +
 "the about dialog will be closed and opened again and again, " +
 "keyboard will be locked sooner or later." +
 "</html>";
public KeyLock() {
 this.setDefaultCloseOperation(EXIT_ON_CLOSE);
 this.setTitle("Keyboard lock test");
 getContentPane().setLayout(new BorderLayout());
 btnBack.setMnemonic('B');
 btnBack.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 KeyLock.this.goBack(e);
 btnNext.setMnemonic('N');
 btnNext.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 KeyLock.this.goNext(e);
 btnAbout.setMnemonic('A');
 btnAbout.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 JOptionPane.showMessageDialog(KeyLock.this, aboutMsg, "About", JOptionPane.INFORMATION_MESSAGE);
 contentPanel.setLayout(new BorderLayout());
 contentPanel.setPreferredSize(new Dimension(400, 250));
 contentPanel.setMinimumSize(new Dimension(400, 250));
 wizardToolPan.setLayout(new FlowLayout());
 wizardToolPan.add(btnBack);
 wizardToolPan.add(btnNext);
 wizardToolPan.add(btnAbout);
 this.getContentPane().add(contentPanel, java.awt.BorderLayout.CENTER);
 this.getContentPane().add(wizardToolPan, java.awt.BorderLayout.SOUTH);
 this.setSize(400, 300);
 this.createContentPanels();
 this.showCurrent();
private Vector<JPanel> slides = new Vector<JPanel>();
private int current = 0;
private void createContentPanels() {
 for (int j = 0; j < 20; ++j) {
 JPanel p = new JPanel(new FlowLayout());
 p.add(new JLabel("Page: " + j));
 p.add(new JTextField("Page: " + j + ", input something here", 20));
 p.add(new JTextField("Page: " + j + ", input something here", 20));
 p.add(new JTextField("Page: " + j + ", input something here", 20));
 p.add(new JLabel("Input something in password box:"));
 p.add(new JPasswordField(20));
 p.add(new JCheckBox("Try click here, focus will be here."));
 p.add(new JRadioButton("Try click here, focus will be here."));
 slides.add(p);
public void showCurrent() {
 if (current < 0 || current >= slides.size())
 return;
 JPanel p = slides.get(current);
 this.contentPanel.add(p, java.awt.BorderLayout.CENTER);
 this.pack();
 Component[] comps = p.getComponents();
 if (comps.length > 0) {
 comps[0].requestFocus(); // try delete this line
 this.repaint();
public void goNext(ActionEvent e) {
 if (current + 1 >= slides.size())
 return;
 this.contentPanel.remove(slides.get(current));
 current++;
 sleep(100);
 this.showCurrent();
public void goBack(ActionEvent e) {
 if (current <= 0)
 return;
 this.contentPanel.remove(slides.get(current));
 current--;
 sleep(100);
 this.showCurrent();
public static void sleep(int millis) {
 try {
 Thread.sleep(millis);
 } catch (Exception e) {
 e.printStackTrace();
public static void main(String[] args) {
 KeyLock wizard = new KeyLock();
 wizard.setVisible(true);
}The first program will lead to keyboard-lock in RHEL 4 and red flag 5, both J2SE 5 and 6.
//---second -----------------------------------------
package test;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class KeyFocusLost extends JFrame {
private JButton btnPopup = new JButton();
private JTextField jTextField1 = new JTextField();
private JPasswordField jPasswordField1 = new JPasswordField();
private JPanel jPanel1 = new JPanel();
private JScrollPane jScrollPane3 = new JScrollPane();
private JTree jTree1 = new JTree();
private JButton btnAbout = new JButton("About");
public static final String aboutMsg =
 "<html> This program is used to find keyboard focus lost problem. " +
 "Click 'popup' button in main window, or select any node in the tree and press F6, " +
 "a dialog popup, and click ok button in the dialog, " +
 "keyboard focus will lost in main window." +
 "</html>";
public KeyFocusLost() {
 this.setDefaultCloseOperation(EXIT_ON_CLOSE);
 this.setTitle("Keyboard focus test");
 getContentPane().setLayout(null);
 btnPopup.setBounds(new Rectangle(33, 482, 200, 35));
 btnPopup.setMnemonic('P');
 btnPopup.setText("Popup and lost focus");
 btnPopup.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 PopupDialog dlg = new PopupDialog(KeyFocusLost.this);
 dlg.setVisible(true);
 btnAbout.setBounds(new Rectangle(250, 482, 100, 35));
 btnAbout.setMnemonic('A');
 btnAbout.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 JOptionPane.showMessageDialog(KeyFocusLost.this, aboutMsg, "About", JOptionPane.INFORMATION_MESSAGE);
 jTextField1.setText("Try input here, and try input in password box below");
 jTextField1.setBounds(new Rectangle(14, 44, 319, 29));
 jPasswordField1.setBounds(new Rectangle(14, 96, 319, 29));
 jPanel1.setBounds(new Rectangle(14, 158, 287, 291));
 jPanel1.setLayout(new BorderLayout());
 jPanel1.add(new JLabel("Select any node in the tree and press F6."), java.awt.BorderLayout.NORTH);
 jPanel1.add(jScrollPane3, java.awt.BorderLayout.CENTER);
 jScrollPane3.getViewport().add(jTree1);
 Object actionKey = "popup";
 jTree1.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_F6, 0), actionKey);
 jTree1.getActionMap().put(actionKey, new AbstractAction() {
 public void actionPerformed(ActionEvent e) {
 PopupDialog dlg = new PopupDialog(KeyFocusLost.this);
 dlg.setVisible(true);
 this.getContentPane().add(jTextField1);
 this.getContentPane().add(jPasswordField1);
 this.getContentPane().add(jPanel1);
 this.getContentPane().add(btnPopup);
 this.getContentPane().add(btnAbout);
public static void main(String[] args) {
 KeyFocusLost keytest = new KeyFocusLost();
 keytest.setSize(400, 600);
 keytest.setVisible(true);
static class PopupDialog extends JDialog {
 private JButton btnOk = new JButton();
 public PopupDialog(Frame owner) {
 super(owner, "popup dialog", true);
 setDefaultCloseOperation(DISPOSE_ON_CLOSE);
 this.getContentPane().setLayout(null);
 btnOk.setBounds(new Rectangle(100, 100, 200, 25));
 btnOk.setMnemonic('O');
 btnOk.setText("OK, then focus lost");
 btnOk.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 PopupDialog.this.getOwner().toFront();
 try {
 Thread.sleep(100); // try delete this line !!!
 } catch (Exception ex) {
 ex.printStackTrace();
 PopupDialog.this.dispose();
 this.getContentPane().add(btnOk);
 this.getRootPane().setDefaultButton(btnOk);
 this.setSize(400, 300);
}The second program will lead to keyboard-focus-lost in RHEL 3/4 and red flag 4/5, J2SE 5, not in J2SE 6.
And I also tried java demo program "SwingSet2" in red flag 5, met keyboard-lock too.
I guess it should be some kind of incompatibleness of J2SE with some Linux platform. Isn't it?
Please help, thanks.

Hi.
I have same problems on Ubuntu with Java 6 (all versions). I would like to use NetBeans or IntelliJ IDEA but it is not possible due to keyboard locks.
I posted this bug
https://bugs.launchpad.net/ubuntu/+bug/174281
before I found some info about it:
http://forums.java.net/jive/thread.jspa?messageID=189281
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6506617
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6568693
I don't know from which part this bug comes, but I wonder why it isn't fixed yet. Does anybody else use NetBeans or IntelliJ IDEA on linux with Java 6 ?
(I cannot insert link :\ )

Error while running Swing program on FreeBSD

Hi,
I am trying to run simple swing program "helloworld"
but while executing it gives following error on FreeBSD
Exception in thread "main" java.lang.UnsatisfiedLinkError:
/usr/local/linux-sun-jdk1.4.2/jre/lib/i386/libawt.so: libXp.so.6:
cannot open shared object file: No such file or directory
 at java.lang.ClassLoader$NativeLibrary.load(Native Method)
 at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1560)
 at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1477)
 at java.lang.Runtime.loadLibrary0(Runtime.java:788)
 at java.lang.System.loadLibrary(System.java:834)
 at sun.security.action.LoadLibraryAction.run(LoadLibraryAction.java:50)
 at java.security.AccessController.doPrivileged(Native Method)
 at sun.awt.NativeLibLoader.loadLibraries(NativeLibLoader.java:38)
 at sun.awt.DebugHelper.<clinit>(DebugHelper.java:29)
 at java.awt.EventQueue.<clinit>(EventQueue.java:80)
 at javax.swing.SwingUtilities.invokeLater(SwingUtilities.java:1170)
 at JPanels.main(JPanels.java:29)
Should i install XFree86-libs package on FreeBsd
configuration
FreeBSD 4.10-BETA (GENERIC)
I am using following packages
linux-sun-jdk-1.4.2.04 Sun Java Development Kit 1.4 for Linux
linux_base-8-8.0_4 Base set of packages needed in Linux mode (only for i386)
linux_devtools-8.0_1 Packages needed for doing development in Linux mode
libtool-1.3.5_1 Generic shared library support script
gmake-3.80_1 GNU version of 'make' utility
automake-1.4.5_9 GNU Standards-compliant Makefile generator (legacy version
GCC 2.95.4
gdb 4.18
ld 2.12.1 supported emulation elf_i386
regards
Man479

This is not really a Swing question. You should install the library which satisfies the lookup of libXp.so.6 .
I quess the jre for this platform is compiled against this version. Looks to me like some X related library, maybe google can resolve a solution/package to install?
Greetz

Concurrent program execution Error

i have genrated a simple report and copied to linux server,could any on help me how to resolve the error.Eventhough I was Getting the output.
ERROR:
Program exited with status 1
Concurrent Manager encountered an error while running Oracle*Report for your concurrent request 4349601.
Review your concurrent request log and/or report output file for more detailed information.

I have copied the message from the logfile itself for complete reference,plz look in to the following error
ERROR
+-----------------------------
| Starting concurrent program execution...
+-----------------------------
APPLLCSP Environment Variable set to :
Current NLS_LANG and NLS_NUMERIC_CHARACTERS Environment Variables are :
American_America.UTF8
Enter Password:
Report Builder: Release 10.1.2.0.2 - Production on Wed Jun 4 16:36:01 2008
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Start of log messages from FND_FILE
End of log messages from FND_FILE
Program exited with status 1
Concurrent Manager encountered an error while running Oracle*Report for your concurrent request 4349601.
Review your concurrent request log and/or report output file for more detailed information.
Executing request completion options...
Output is not being printed because:
The print option has been disabled for this report.
Finished executing request completion options.
Concurrent request completed
Current system time is 04-JUN-2008 16:36:02
---------------------------------------------------------------------------

Date format changes in the middle of a program execution

In my C code I have a series of select statements.
When I first get a session to the database I use the following command to set the date format
alter session set nls_date_format = 'MM/DD/YYYY HH24:MI:SS'
It works fine for a few queries. After a while during the program execution I see that the date format changes to 'DD-MON-YY' format. This results in a series of error in my code because I expect the date format to always be in the 'MM/DD/YYYY HH24:MI:SS' format.
Any idea why the date format should change all of a sudden in the middle of the program execution.

I second the idea that you should always use TO_DATE and TO_CHAR if you want to reliably convert between dates and strings.
Without seeing your code, it is hard to say why your date format is changing, but the most likely reason is that you are changing users somewhere in the code. For example:
SQL> show user
USER is "OPS$ORACLE"
SQL> SELECT sysdate FROM dual;
SYSDATE
11-JUL-2003
SQL> ALTER SESSION SET nls_date_format='dd-Mon-yyyy hh24:mi:ss';
Session altered.
SQL> SELECT sysdate FROM dual;
SYSDATE
11-Jul-2003 10:15:12
SQL> connect jtest/test
Connected.
SQL> SELECT sysdate FROM dual;
SYSDATE
11-JUL-2003TTFN
John

Running a Swing program from another program

I'm having what is most likely newbie problems since I'm relatively new to Swing programming. Basically my situation is this: I've got a program that looks at its command line parameters and either runs through a series of actions or presents a Swing GUI to allow the user to step through the actions one by one.
My problem is that I bascially don't know how to call (instantiate, declare, etc.) the GUI from my Java code. I tried implementing the GUI class with a runnable interface, but evertime I try to invoke the start on the interface I'm getting an error. I have a feeling I'm just missing something. The Swing GUI works fine if I call it on its own so it's the code the invokes it from the small command line processor that I'm goofing up somehow.
So to recap, I have a small Java app that I'm trying to call a GUI that I've built and can't seem to get the code right.
Any pointers to examples or explanation on how to accomplish the above are welcome.
Thanks,
Ed

That the "2" is printed out immediately is as expected, but I don't understand why the JVM exits. The following is, AFAIK, a trimmed down version of what you are doing, and if you run it you'll see that the frame remains until you close it manually:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
public class ShowFrame {
    public static void main(String[] args) {
        AppFrame gui = new AppFrame();
        gui.run();
    private static class AppFrame extends JFrame implements Runnable {
        public AppFrame() {
            setDefaultCloseOperation(EXIT_ON_CLOSE);
            JButton btn = new JButton("Close");
            btn.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    AppFrame.this.dispose();
            getContentPane().add(btn);
            pack();
            setLocationRelativeTo(null);
        public void run() {
            System.out.println("1");
            this.setVisible(true);
            System.out.println("2");
}Maybe someone else can shed some light over your problem...

Remote Program Execution

Dear Sir,
I have following problem and very desperately looking for the solution .
I have 9ias installed on window-2000 server and on this machine JSP/Servlet is also running .
There is another Unix server also having Oracle 7.3.4 and Pro*C installed .
My requirement is that on receiving a web client request , the invoked JSP must also execute a C program on the unix machine ( the execution of C program creates a text output file on the unix machine ) and after completion of C program execution the output text file must be available to JSP . As a final result of JSP execution this output text file must be returned to WEB Client .
Please guide me how to go about this .
Thanks and Regards
B V Mittal

Call your C program like this from your controller servlet
Process p = Runtime.getRuntime().exec("c.exe");
BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
Then read from your generated file and populate whatever you need into a bean.

How do I insert or delete a row in tree during program execution ?

Trying to understand how to edit/modify a tree control during program execution, specifically if I want to add a row or delete a row.
Thanks

Hi dwjef,
Go through this.I think by going through this you we will get an idea of how to achieve what you are trying.
https://decibel.ni.com/content/docs/DOC-20747
Thanks as kudos only

How do I pinpoint the program execution?

Hi all,
I am wondering how to pinpoint the program's execution point? I have a problem with all of the loops not stopping properly. I hit the "Hilight Program execution" and it went to one loop, that is, it appeared greyed out, but I can't figure out which case it's stuck in. Is there a way to find the exact *point* of execution?
Thanks,
Jason

You can use breakpoints. The program will pause as soon as it hit the breakpoint. To add breakpoints, right-click in the place where you want it and set it. You can also set probes. The probes activate as soon as the information is available. Then you can be creative with the highlight execution, breakpoints and probes. You can have a fairly good idea on how your program is executing.
Otherwise, try posting your code or an image of your code so we can try to figure out what is going on.
www.vartortech.com

Placing a telnet session within a java swing program

I was wondering if there was a way to maybe anchor a telnet session into a JPanel within a Java Swing program. Most of my users end up running a telnet session while using my Swing Program and I was hoping to find a way to bring the two together. If this is possible could someone point me in the right direction (like an online resource) that might show me how to do this.

You could use sockets and a TextArea and build your own simple telnet application.
Socket tutorial: http://java.sun.com/docs/books/tutorial/networking/sockets/index.html

Regarding Execution flow in webdynpro component

Hi all,
I am confused regarding the execution flow.
we have "component controller" and "view controller" in a webdynpro component.
I have written some code in "wdDoInit" of "component controller" and in "wdDoInit" of "view controller" and in "wdDoModifyView" of "view controller" .
If I do "Deploy and Run " the application , Which one is executed first ,I mean how is the code processed ,where the control reaches first?
Thanks in advance.

In a web dynpro application there is always a interface view specified.
This interface view is associated with a window. The window has set of views with one as default view.
When Web Dynpro application is launched, the window is instantiated via interface view specified. The window after instantiation is rendered on the brower/some other UI client.
The window when instantiated will instantiate the default view also. So wdDoInit of view controller will be called now. Now if navigation happens to some other view in the window that particular view has to be instantiated. So the wdDoInit of that view will be called then.
Is your question answered ?
Regards,
Ashwani Kr Sharma

Swing program - how to increase the size

Hi Friends,
I have made a simple swing program and it works fine.But I am not able to make the size(width,height) of the panel.Can someone please tell me how can i do that.Here's some part of my code...
public class Test extends JPanel
                             implements ActionListener {
    //instance variable declared here
    public Test() {
        super(new BorderLayout());
        //code for buttons,labels etc
        JPanel buttonPanel = new JPanel(); //use FlowLayout
        add(buttonPanel, BorderLayout.PAGE_START);
    public void actionPerformed(ActionEvent e) {
        //lots of code
     * Create the GUI and show it. For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("Test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Create and set up the content pane.
        JComponent newContentPane = new Test();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
}Thanks for your help.

OK sorry for that,in future i will post it in the right place.I tried doing this but didn't worked:
       JPanel buttonPanel = new JPanel(); //use FlowLayout
       // buttonPanel.setSize(300, 300);I was followin the FileChooserDemo example from this link:
http://java.sun.com/docs/books/tutorial/uiswing/components/examples/index.html#FileChooserDemo
And they used the pack there....now can you help please.

Compiling .java files during program execution.

I have a program that read events in from a file and creates custom Event objects (which extend Thread) from this information, and then later the events are activated depending on the timing information that was provided in the file. Everything works great however, I would like to add the ability to include custom Events in the file that the events are read from. I would like the program to take that java code information and produce a class file that can be used during the programs execution. What classes can help me do this and are there any examples that anybody knows of, of something like this?

I wonder if anyone has ever tried to do this before...
http://onesearch.sun.com/search/developers/index.jsp?col=devforums&qp_name=Java+Programming&qp=forum%3A31&qt=dynamic+compilation+compile+runtime

Swing program execution flow

Similar Messages

Maybe you are looking for