Fit JButtons in a JFrame

Hy, I am actually creating a Graphical Programming Language Appln and I am facing some problems.
My source code is found below. Here is my problem:
I have inserted some buttons have been inserted in the Main panel until both scroll bar appear,
what I want is that when I click on the button label "Fit", a new window opens,
where it shows the buttons which have been fitted in that window, without any scrollbar.How to do that?
Please send me the code for solving this problem. Its very very urgent.Here are my Code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import javax.swing.tree.*;
import java.io.*;
public class MainDesktop extends JFrame implements ActionListener {
JSplitPane splitPane = new JSplitPane();
JPanel mainPane = new JPanel();
JScrollPane mainScrollPane = new JScrollPane();
Container contentPane = getContentPane();
public MainDesktop() {
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
//Adding the ToolBar to the main window
JToolBar toolBar = new JToolBar();
myToolBar(toolBar);
contentPane.add(toolBar, BorderLayout.NORTH);
//create a list of button and add them to a pane
JButton bgButton = new JButton("Begin");
JButton rdButton = new JButton("Read");
JButton wrButton = new JButton("Write");
JButton efButton = new JButton("If-Else");
JButton ifButton = new JButton("End-If");
JButton wlButton = new JButton("While-Loop");
JButton flButton = new JButton("For-Loop");
JButton elButton = new JButton("End-Loop");
JButton swButton = new JButton("Switch");
JButton arButton = new JButton("Arithmetic");
JButton enButton = new JButton("End");
bgButton.setActionCommand("Begin");
rdButton.setActionCommand("Read");
wrButton.setActionCommand("Write");
efButton.setActionCommand("If-Else");
ifButton.setActionCommand("End-If");
wlButton.setActionCommand("While-Loop");
flButton.setActionCommand("For-Loop");
elButton.setActionCommand("End-Loop");
swButton.setActionCommand("Switch");
arButton.setActionCommand("Arithmetic");
enButton.setActionCommand("End");
bgButton.addActionListener(this);
rdButton.addActionListener(this);
wrButton.addActionListener(this);
efButton.addActionListener(this);
ifButton.addActionListener(this);
wlButton.addActionListener(this);
flButton.addActionListener(this);
elButton.addActionListener(this);
swButton.addActionListener(this);
arButton.addActionListener(this);
enButton.addActionListener(this);
JPanel toolPane = new JPanel();
toolPane.setLayout(new GridLayout(15,0));
toolPane.add(bgButton);
toolPane.add(rdButton);
toolPane.add(wrButton);
toolPane.add(efButton);
toolPane.add(ifButton);
toolPane.add(wlButton);
toolPane.add(flButton);
toolPane.add(elButton);
toolPane.add(swButton);
toolPane.add(arButton);
toolPane.add(enButton);
//Create a pane for the drawing area and add scroll pane to it
mainPane.setLayout(new FlowLayout());
mainScrollPane = new JScrollPane(mainPane);
mainScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
mainScrollPane.setHorizontalScrollBarPolicy (JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
mainScrollPane.setLayout(new ScrollPaneLayout());
//Create a split pane with the two scroll panes in it
splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,toolPane, mainScrollPane);
splitPane.setOneTouchExpandable(true);
splitPane.setDividerLocation(100);
splitPane.setPreferredSize(new Dimension(1000, 650));
getContentPane().add(splitPane);
protected void myToolBar(JToolBar toolBar) {
//Fit button
JButton fitButton = new JButton("Fit");
fitButton.setToolTipText("Fit Flowchart to drawing area");
fitButton.setActionCommand("Fit");
fitButton.addActionListener(this);
toolBar.add(fitButton);
public void actionPerformed(ActionEvent e) {
String cmd = e.getActionCommand();
if (cmd.equals("Fit")) {
//fit flowchart to drawing area
if (cmd.equals("Delete")) {
//Delete a node from flowchart
//Action command for the list of button from the toolbox
if (cmd.equals("Begin")) {
dragbutton drag = new dragbutton();
mainPane.add(drag);
if (cmd.equals("Read")) {
dragbutton drag = new dragbutton();
mainPane.add(drag);
if (cmd.equals("Write")) {
dragbutton drag = new dragbutton();
mainPane.add(drag);
if (cmd.equals("If-Else")) {
dragbutton drag = new dragbutton();
mainPane.add(drag);
if (cmd.equals("End-If")) {
dragbutton drag = new dragbutton();
mainPane.add(drag);
if (cmd.equals("While-Loop")) {
dragbutton drag = new dragbutton();
mainPane.add(drag);
if (cmd.equals("For-Loop")) {
dragbutton drag = new dragbutton();
mainPane.add(drag);
if (cmd.equals("End-Loop")) {
dragbutton drag = new dragbutton();
mainPane.add(drag);
if (cmd.equals("Switch")) {
dragbutton drag = new dragbutton();
mainPane.add(drag);
if (cmd.equals("Arithmetic")) {
dragbutton drag = new dragbutton();
mainPane.add(drag);
//mainPane.repaint();
if (cmd.equals("End")) {
dragbutton drag = new dragbutton();
mainPane.add(drag);
//mainPane.repaint();
class dragbutton extends JButton implements DragGestureListener, DragSourceListener {
public dragbutton() {
super("Begin");
DragSource dragSource = DragSource.getDefaultDragSource();
dragSource.createDefaultDragGestureRecognizer(this,DnDConstants.ACTION_COPY_OR_MOVE,this);
public void dragGestureRecognized(DragGestureEvent e) {
e.startDrag(DragSource.DefaultCopyDrop,
new StringSelection(null),this);
public void dragDropEnd(DragSourceDropEvent e) {}
public void dragEnter(DragSourceDragEvent e) {}
public void dragExit(DragSourceEvent e) {}
public void dragOver(DragSourceDragEvent e) {}
public void dropActionChanged(DragSourceDragEvent e) {}
public static void main(String [] args) {
MainDesktop mainWindow = new MainDesktop();
mainWindow.setTitle("Graphical Programming Language");
mainWindow.setSize(700, 600);
mainWindow.setVisible(true);

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//Sets the background colour to a dark blue colour
main.setBackground (Color.black);
//Makes the container visible
setVisible (true);
public void paint (Graphics g)
super.paint (g);
g.setColor (Color.white);
if (label == "MainMenu")
for (int x = 0 ; x <= 50 ; ++x)
g.setColor (Color.white);
g.setFont (new Font ("Arial", Font.BOLD, x));
g.drawString ("T R A P P E D", 100, 125);
d.delay (10);
if (x != 50)
g.setColor (Color.black);
g.drawString ("T R A P P E D", 100, 125);
if (label == "Entrance")
l.Entrance ("ONE", g);
label = "LevelOne";
if (label == "LevelOne")
l.LevelOne (g, levelOne, gbc);
label = "";
public static void main (String[] args)
// calls the program
User_Interface application = new User_Interface ();
application.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
} //End of Main Method
//Libraries
import java.awt.*;
import java.io.*;
import javax.swing.*;
import java.awt.event.*;
public class Levels extends Objects
private JFrame frame = new JFrame ();
//Sets location, size, and visiblity to the frame where the JOptionPane
//will be placed
frame.setLocation (600, 600);
frame.setSize (1, 1);
frame.setVisible (false);
public int xCord = 2;
public int yCord = 2;
public void LevelOne (Graphics g, JPanel one, GridBagConstraints gbc)
***Trying to add the button, doesn't appear. Tried adding to the container, and any JPanel i had created***
JButton button1 = new JButton ("TEST");
one.add (button1);
g.setColor (Color.white);
g.fillRect (500, 100, 200, 300);
g.setColor (Color.black);
g.drawRect (500, 100, 200, 300);
g.setFont (new Font ("Verdana", Font.BOLD, 25));
g.setColor (Color.black);
g.drawString ("LEVEL ONE", 525, 80);
//ROW ONE
counter = -80;
counter2 = 200;
for (int a = 1 ; a <= 7 ; ++a)
if (xCord < a && yCord == 0)
g.setColor (darkGray);
g.fillRect (xLoc + counter, yLoc - 80, 40, 40);
g.setColor (Color.black);
g.drawRect (xLoc + counter, yLoc - 80, 40, 40);
if (xCord > a - 1 && yCord == 0)
g.setColor (darkGray);
g.fillRect (xLoc + counter2, yLoc - 80, 40, 40);
g.setColor (Color.black);
g.drawRect (xLoc + counter2, yLoc - 80, 40, 40);
counter += 40;
counter2 += 40;
*****Theres 9 more rows, just edited out to save space****
int y = 100;
int x = 100;
for (int a = 0 ; a < 20 ; ++a)
g.setColor (Color.white);
g.fillRoundRect (x, y, 40, 40, 5, 5);
g.setColor (Color.black);
g.drawRoundRect (x, y, 40, 40, 5, 5);
y += 40;
if (a == 9)
x += 320;
y = 100;
x = 140;
y = 100;
for (int a = 0 ; a < 14 ; ++a)
g.setColor (Color.white);
g.fillRoundRect (x, y, 40, 40, 5, 5);
g.setColor (Color.black);
g.drawRoundRect (x, y, 40, 40, 5, 5);
x += 40;
if (a == 6)
x = 140;
y += 360;
g.setColor (Color.black);
g.drawRect (100, 100, 360, 400);
ImageIcon[] images = new ImageIcon [4];
images [0] = new ImageIcon ("arrow_left.gif");
images [1] = new ImageIcon ("arrow_up.gif");
images [2] = new ImageIcon ("arrow_down.gif");
images [3] = new ImageIcon ("arrow_right.gif");
int direction = -1;
*****This is where I tried to have the OptionPane show the directional buttons******
//frame.setVisible (true);
// direction = JOptionPane.showOptionDialog (frame, "Choose Your Path:", "Trapped", JOptionPane.YES_NO_CANCEL_OPTION,
// JOptionPane.QUESTION_MESSAGE,
// null,
// images,
// images [3]);
// if (direction == 0)
// if (xCord - 1 > 0)
// xCord -= 1;
// xLoc += 40;
// if (direction == 1)
// if (yCord - 1 > 0)
// yCord -= 1;
// yLoc += 40;
// if (direction == 2)
// if (yCord + 1 < 9)
// yCord += 1;
// yLoc -= 40;
// if (direction == 3)
// if (xCord + 1 < 13)
// xCord += 1;
// xLoc -= 40;
//LevelOne (g, one, gbc);
}

i tried adding a keylistener, that didn't work too well, i had tried to add it to a button and a textarea which i added to the 'one' frame, it didn't show up, and it didn't work. How would i go about changing the paint method so that it doesn't contain any logic? That's the only way I could think of getting the program to move forward in the game. Thanks.
//Libraries
import java.awt.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.text.*;
public class User_Interface extends JFrame
    static Levels l = new Levels ();
    static Delay d = new Delay ();
    private Container contentPane = getContentPane ();
    private JPanel main, levelOne;
    private String level;
    private CardLayout cc = new CardLayout ();
    private GridBagConstraints gbc = new GridBagConstraints ();
    private JPanel c = new JPanel ();
    private String label = "MainMenu";
    public User_Interface ()
        //Generates the User-Interface
        super ("Trapped");
        main = new JPanel ();
        GridBagLayout gbl = new GridBagLayout ();
        main.setLayout (gbl);
        c.setLayout (cc);
        // set_gbc (gbc, 2, 2, 5, 5, GridBagConstraints.NONE);
        c.add (main, "Main Page");
        contentPane.add (c, BorderLayout.CENTER);
        cc.show (c, "Main Page");
        levelOne = new JPanel ();
        levelOne.setLayout (new GridBagLayout ());
        levelOne.setBackground (Color.black);
        c.add (levelOne, "LevelOne");
        JMenuBar menu = new JMenuBar ();
        JMenu file = new JMenu ("File");
        JMenu help = new JMenu ("Help");
        JMenuItem about = new JMenuItem ("About");
        JMenuItem mainmenu = new JMenuItem ("Main Menu");
        mainmenu.addActionListener (
                new ActionListener ()
            public void actionPerformed (ActionEvent event)
                cc.show (c, "Main Page");
                label = "MainMenu";
        JMenuItem newGame = new JMenuItem ("New Game");
        newGame.addActionListener (
                new ActionListener ()
            public void actionPerformed (ActionEvent event)
                l.xCord = 2;
                l.yCord = 2;
                l.xLoc = 140;
                l.yLoc = 140;
                JPanel entrance = new JPanel ();
                entrance.setLayout (new FlowLayout ());
                c.add (entrance, "Entrance");
                label = "Entrance";
                level = "ONE";
                cc.show (c, "Entrance");
        JMenuItem loadgame = new JMenuItem ("Load Game");
        JMenuItem savegame = new JMenuItem ("Save Game");
        JMenuItem exit = new JMenuItem ("Exit");
        exit.addActionListener (
                new ActionListener ()
            public void actionPerformed (ActionEvent event)
                JFrame frame = new JFrame ();
                frame.setLocation (10, 10);
                JOptionPane.showMessageDialog (frame, "Come Back Soon!", "TRAPPED", JOptionPane.INFORMATION_MESSAGE);
                System.exit (0);
        file.add (about);
        file.add (mainmenu);
        file.add (newGame);
        file.add (loadgame);
        file.add (savegame);
        file.add (exit);
        menu.add (file);
        menu.add (help);
        setJMenuBar (menu);
        //Sets the size of the container (columns by rows)
        setSize (750, 550);
        //Sets the location of the container
        setLocation (10, 10);
        //Sets the background colour to a dark blue colour
        main.setBackground (Color.black);
        //Makes the container visible
        setVisible (true);
    public void paint (Graphics g)
        super.paint (g);
        g.setColor (Color.white);
        if (label == "MainMenu")
            for (int x = 0 ; x <= 50 ; ++x)
                g.setColor (Color.white);
                g.setFont (new Font ("Arial", Font.BOLD, x));
                g.drawString ("T    R    A    P    P    E    D", 100, 125);
                d.delay (10);
                if (x != 50)
                    g.setColor (Color.black);
                    g.drawString ("T    R    A    P    P    E    D", 100, 125);
        if (label == "Entrance")
            l.Entrance ("ONE", g);
            label = "LevelOne";
        if (label == "LevelOne")
            l.LevelOne (g, levelOne, gbc);
            label = "";
        //g.setColor (new Color
    public static void main (String[] args)
        // calls the program
        User_Interface application = new User_Interface ();
        application.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
    } //End of Main Method
//Libraries
import java.awt.*;
import java.io.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.ActionMap;
import javax.swing.plaf.*;
public class Levels extends Objects
    implements KeyListener
    //static final String newline = System.getProperty ("line.separator");
    JButton button;
    private JFrame frame = new JFrame ();
        //Sets location, size, and visiblity to the frame where the JOptionPane
        //will be placed
        frame.setLocation (600, 600);
        frame.setSize (1, 1);
        frame.setVisible (false);
    JButton button1;
    public int xCord = 2;
    public int yCord = 2;
    public void LevelOne (Graphics g, JPanel one, GridBagConstraints gbc)
    //    button = new JButton ("TEST");
    //    ButtonHandler handler = new ButtonHandler ();
     //   button.addActionListener (handler);
      // one.add (button);
        g.setColor (Color.white);
        g.fillRect (500, 100, 200, 300);
        g.setColor (Color.black);
        g.drawRect (500, 100, 200, 300);
        g.setFont (new Font ("Verdana", Font.BOLD, 25));
        g.setColor (Color.black);
        g.drawString ("LEVEL ONE", 525, 80);
        //ROW ONE
        counter = -80;
        counter2 = 200;
        for (int a = 1 ; a <= 7 ; ++a)
            if (xCord < a && yCord == 0)
                g.setColor (darkGray);
                g.fillRect (xLoc + counter, yLoc - 80, 40, 40);
                g.setColor (Color.black);
                g.drawRect (xLoc + counter, yLoc - 80, 40, 40);
            if (xCord > a - 1 && yCord == 0)
                g.setColor (darkGray);
                g.fillRect (xLoc + counter2, yLoc - 80, 40, 40);
                g.setColor (Color.black);
                g.drawRect (xLoc + counter2, yLoc - 80, 40, 40);
            counter += 40;
            counter2 += 40;
        int y = 100;
        int x = 100;
        for (int a = 0 ; a < 20 ; ++a)
            g.setColor (Color.white);
            g.fillRoundRect (x, y, 40, 40, 5, 5);
            g.setColor (Color.black);
            g.drawRoundRect (x, y, 40, 40, 5, 5);
            y += 40;
            if (a == 9)
                x += 320;
                y = 100;
        x = 140;
        y = 100;
        for (int a = 0 ; a < 14 ; ++a)
            g.setColor (Color.white);
            g.fillRoundRect (x, y, 40, 40, 5, 5);
            g.setColor (Color.black);
            g.drawRoundRect (x, y, 40, 40, 5, 5);
            x += 40;
            if (a == 6)
                x = 140;
                y += 360;
        g.setColor (Color.black);
        g.drawRect (100, 100, 360, 400);
        ImageIcon[] images = new ImageIcon [4];
        images [0] = new ImageIcon ("arrow_left.gif");
        images [1] = new ImageIcon ("arrow_up.gif");
        images [2] = new ImageIcon ("arrow_down.gif");
        images [3] = new ImageIcon ("arrow_right.gif");
        int direction = -1;
        //frame.setVisible (true);
        // direction = JOptionPane.showOptionDialog (frame, "Choose Your //\Path:", "Trapped", JOptionPane.YES_NO_CANCEL_OPTION,
        //         JOptionPane.QUESTION_MESSAGE,
        //         null,
        //         images,
        //         images [3]);
        // if (direction == 0)
        //     if (xCord - 1 > 0)
        //         xCord -= 1;
        //         xLoc += 40;
        // if (direction == 1)
        //     if (yCord - 1 > 0)
        //         yCord -= 1;
        //         yLoc += 40;
        // if (direction == 2)
        //     if (yCord + 1 < 9)
        //         yCord += 1;
        //         yLoc -= 40;
        // if (direction == 3)
        //     if (xCord + 1 < 13)
        //         xCord += 1;
        //         xLoc -= 40;
        one.addKeyListener (this);
        // one.add (button1);
        if (xCord == 1)
            LevelOne (g, one, gbc);
    /** Handle the key typed event from the text field. */
    public void keyTyped (KeyEvent e)
    /** Handle the key pressed event from the text field. */
    public void keyPressed (KeyEvent e)
        if (e.getSource () == "Up")
            JOptionPane.showMessageDialog (null, "Hi", "Hi", 0, null);
    /** Handle the key released event from the text field. */
    public void keyReleased (KeyEvent e)
        // displayInfo (e, "KEY RELEASED: ");
}

Image in a JFrame

I want to display an image (.jpg) in a JFrame.
How?
I'm using Containers and setBounds for the JButtons in the JFrame.

Hi,
By default a JFrame uses BorderLayout manager. You don't need to setBounds because the layout manager will override them anyway. If the JLabel is the only thing in the frame then the previous poster code will work correctly. If it doesn't display, then you are doing something different and you should show us some code and we can tell you what ...
Regards,
Manfred.

Jbutton to open a htm file in browser - simple question

not sure where to look for this, but its a simple question
I just want to get a jbutton (from a jFrame)to open a local htm page eg:
When pressing the button open:
C:\Documents and Settings\****\My Documents\profile.htm
- Open this with any browser
any pointers to look in the right direction, couldn't find it with search
I dont want to use a JEditorPane to display the htm, just open any browser
Edited by: Mr_Tuition on Dec 7, 2007 3:40 AM

I also wont be able to use it to open an local file which will be set up differently on each computer:
C:\\Documents and Settings\\***\\My Documents\\JavaProjX\\Preview\\profile.htmI want to use just: Preview\\profile.htm so it opens from the same location with different users, but
try { Process process = Runtime.getRuntime().exec("C:\\Program Files\\Internet Explorer\\IEXPLORE.EXE Preview\\profile.htm");}
catch(IOException e) { System.out.println("could open IE");}opens: http://preview/profile.htm (incorrect location)
I have just found I can use System.getProperty("user.dir"); to get the location of my program (i think)
Edited by: Mr_Tuition on Dec 7, 2007 4:25 AM

Problem Manipulating JFrames

Ok,
I'm currently trying to figure out what's going on with my code (see below). Basically, when you run the program, it builds and displays a options JFrame window. Once you click Ok, it closes the current window, prompts for necessary input, builds and displays an output window, and starts to process data. Ok, my code works great, but when I run the program and it comes time to output data to the output window, it doesn't update the window in real time as it's processing the data, it waits until the program is done executing and processing data, but if I cancel out the code that builds and displays the options window, it works fine and updates the output window as it's processing each value. I've tried several methods moving the code around, setting setVisible() at different times and whatnot. The only way I've gotthe output window to update in real time is commenting out the call to display the options window. I absolutely cannot figure out why this is occurring. Any help is greatly appreciated! Thanks!
import java.awt.event.*;
import java.io.*;
import java.net.*;
import javax.swing.*;
import javax.swing.filechooser.FileSystemView;
import java.awt.*;
import java.lang.*;
public class urlCheck extends JPanel implements ActionListener, ItemListener {
    static File outFile;
    static int countRec;
    static JButton okButton;
    static JFrame oframe;
    static JFrame frame;
    static JPanel panel;
    static JPanel opanel;
    static JScrollPane sp;
    static JLabel jl;
    static JTextArea jt;
    static JCheckBox netCheck;
    static JCheckBox orgCheck;
    static JCheckBox bizCheck;
    static boolean runNetCheck = false;
public static void main (String args[]) throws IOException {
      displayOptions();
      //Testing call...
      //mainCall();
public static void displayOptions(){
        FlowLayout fl = new FlowLayout();
        oframe = new JFrame("Options");
        opanel = new JPanel();
        opanel.setLayout(fl);
        //JCheckBox wwwCheck = new JCheckBox("Check www.");
        netCheck = new JCheckBox("Check .net");
        orgCheck = new JCheckBox("Check .org");
        bizCheck = new JCheckBox("Check .biz");
        okButton = new JButton("Ok");
        //opanel.add(wwwCheck);
        opanel.add(netCheck);
        opanel.add(orgCheck);
        opanel.add(bizCheck);
        opanel.add(okButton);
        oframe.add(opanel);
        oframe.setSize(400,100);
        oframe.setLocation(300,300);
        oframe.setVisible(true);
        oframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        okButton.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent evt) {
            oframe.setVisible(false);
            try {
              mainCall();
            catch (IOException f) {
        netCheck.addItemListener(new ItemListener() {
          public void itemStateChanged(ItemEvent e) {
            if (e.getStateChange() == 1) {
              runNetCheck = true;
public static void displayOutput() {
    frame = new JFrame("An Output Window");
    panel = new JPanel();
    jt = new JTextArea(19,25);
    sp = new JScrollPane(jt);
    jl = new JLabel();
    jl.setText("");
    panel.add(sp);
    panel.add(jl);
    frame.add(panel);
    frame.setSize(300,375);
    frame.setLocation(300,300);
    frame.setVisible(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
public static void mainCall() throws IOException {
    FileReader fr = new FileReader(getFile());
    FileWriter INUSE = new FileWriter(outFile.toString().substring(0,3)+"urls_notavailable.txt");
    FileWriter AVAIL = new FileWriter(outFile.toString().substring(0,3)+"urls_available.txt");
    BufferedReader br = new BufferedReader(fr);
    RandomAccessFile randFile = new RandomAccessFile(outFile,"r");
    FileReader fileRead = new FileReader(outFile);
    LineNumberReader lineRead = new LineNumberReader(fileRead);
    //Comment out when running displayOptions in main
    //displayOutput();
    getNumOfLines(randFile, lineRead, fileRead);
    String s;
    int i = 1;
    while ((s = br.readLine()) != null) {
      String domain = ".com";
      jt.append("Testing URL: " + "http://"+s+domain+"\n");
      jl.setText("Testing URL: " + i + " of " + countRec);
      if (runCheck(s,domain)) {
        INUSE.write(s+domain+"\n");
      else {
        AVAIL.write(s+domain+"\n");
      i++;
      if (runNetCheck) {
        domain = ".net";
      jt.append("Testing URL: " + "http://"+s+domain+"\n");
      jl.setText("Testing URL: " + i + " of " + countRec);
      if (runCheck(s,domain)) {
        INUSE.write(s+domain+"\n");
      else {
        AVAIL.write(s+domain+"\n");
      i++;
    fr.close();
    INUSE.close();
    AVAIL.close();
    jt.append("--Process Complete--");
    JOptionPane.showMessageDialog(null,"Created Files: "
+outFile.toString().substring(0,3)+"urls_available.txt &"
+outFile.toString().substring(0,3)+"urls_notavailable.txt","Output Files",JOptionPane.INFORMATION_MESSAGE);
public static File getFile() {
    final JFileChooser fc = new JFileChooser();
    fc.setDialogTitle("Open Line-Delimited Word Dictionary File");
    fc.setApproveButtonText("Open File");
    int returnVal = fc.showOpenDialog(null);
    outFile = fc.getSelectedFile();
    return outFile;
public static boolean runCheck(String address, String domain) {
     try {
    // Construct data
    String data = URLEncoder.encode("key1", "UTF-8") + "=" + URLEncoder.encode("value1", "UTF-8");
    data += "&" + URLEncoder.encode("key2", "UTF-8") + "=" + URLEncoder.encode("value2", "UTF-8");
    // Send data
    URL url = new URL("http://"+address+domain+":80");
    URLConnection conn = url.openConnection();
    conn.setDoOutput(true);
    OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
    wr.write(data);
    wr.flush();
    // Get the response
    BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    if (rd.ready()) { return false; }
    wr.close();
    rd.close();
    catch (Exception e) {
      return true;
    return false;
public static void getNumOfLines(RandomAccessFile randFile, LineNumberReader lineRead, FileReader fileRead) {
    try
        long lastRec=randFile.length();
        randFile.close();
        lineRead.skip(lastRec);
        countRec=lineRead.getLineNumber();
        if (runNetCheck) { countRec = countRec * 2; }
        jl.setText(String.valueOf(countRec));
        fileRead.close();
        lineRead.close();
    catch(IOException e)
public void actionPerformed(ActionEvent e) {
    public void itemStateChanged(ItemEvent e) {
}Edited by: Dave__ on Oct 7, 2008 9:40 AM

You've likely got a concurrency issue where a long-processing method is freezing Swing's EDT. Have you tried calling long-running processes in a background thread, such as by using a SwingWorker object?

JFrame (menubar) problem

Hi,
I have a JFrame with few JPanels on it ( those in turn have JButtons etc). JFrame has the ussual menubar ( set using setJMenuBar) . Menubar is not accessiable using <TAB> . All other items are. Any ideas?
Thank you in advence for any help.

Why do you want it to be accessible through pressing tab?
If you haven't noticed, you can't <TAB> your way to the menubar in any normal GUI application on any platform.

JButton not visible after use of Jpanel removeAll ..

Hi!
I'm having a calculator class that inherits JFrame. I need to add more buttons after setting an option from the (view) menu bar .. (from normal to scientific calculator). I needed to use the JPanel removeAll method and then add the normal buttons plus extra buttons. But the problem is, that the Buttons are only visible when I touch them with the mouse.
Does anybody know why? Thanks for your help!
See code below (still in construction phase):
Name: Hemanth. B
Original code from Website: java-swing-tutorial.html
Topic : A basic Java Swing Calculator
Conventions Used in Source code
     1. All JLabel components start with jlb*
     2. All JPanel components start with jpl*
     3. All JMenu components start with jmenu*
     4. All JMenuItem components start with jmenuItem*
     5. All JDialog components start with jdlg*
     6. All JButton components start with jbn*
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Calculator extends JFrame
implements ActionListener {
// Constants
final int NORMAL = 0;
final int SCIENTIFIC = 8;
final int MAX_INPUT_LENGTH = 20;
final int INPUT_MODE = 0;
final int RESULT_MODE = 1;
final int ERROR_MODE = 2;
// Variables
int displayMode;
int calcType = SCIENTIFIC;
boolean clearOnNextDigit, percent;
double lastNumber;
String lastOperator, title;
private JMenu jmenuFile, jmenuView, jmenuHelp;
private JMenuItem jmenuitemExit, jmenuitemAbout;
private JRadioButtonMenuItem jmenuItemNormal = new JRadioButtonMenuItem("Normal");
private JRadioButtonMenuItem jmenuItemScientific = new JRadioButtonMenuItem("Scientific");
private     ButtonGroup viewMenuButtonGroup = new ButtonGroup();
private JLabel jlbOutput;
private JButton jbnButtons[];
private JPanel jplButtons, jplMaster, jplBackSpace, jplControl;
* Font(String name, int style, int size)
Creates a new Font from the specified name, style and point size.
Font f12 = new Font("Verdana", 0, 12);
Font f121 = new Font("Verdana", 1, 12);
// Constructor
public Calculator(String title) {
/* Set Up the JMenuBar.
* Have Provided All JMenu's with Mnemonics
* Have Provided some JMenuItem components with Keyboard Accelerators
     //super(title);
     this.title = title;
     //displayCalculator(title);
}     //End of Contructor Calculator
private void displayCalculator (String title) {
     //add WindowListener for closing frame and ending program
     addWindowListener (
     new WindowAdapter() {
     public void windowClosed(WindowEvent e) {
     System.exit(0);
     //setResizable(false);
//Set frame layout manager
     setBackground(Color.gray);
     validate();
     createMenuBar();
     createMasterPanel();
     createDisplayPanel();
     clearAll();
     this.getContentPane().validate();
     requestFocus();
     pack();
     //getContentPane().
     setVisible(true);
private void createMenuBar() {
jmenuFile = new JMenu("File");
jmenuFile.setFont(f121);
jmenuFile.setMnemonic(KeyEvent.VK_F);
jmenuitemExit = new JMenuItem("Exit");
jmenuitemExit.setFont(f12);
jmenuitemExit.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_X,
                                        ActionEvent.CTRL_MASK));
jmenuFile.add(jmenuitemExit);
jmenuView = new JMenu("View");
jmenuFile.setFont(f121);
jmenuFile.setMnemonic(KeyEvent.VK_W);
jmenuItemNormal.setMnemonic(KeyEvent.VK_N);
viewMenuButtonGroup.add(jmenuItemNormal);
jmenuView.add(jmenuItemNormal);
jmenuItemScientific.setMnemonic(KeyEvent.VK_S);
viewMenuButtonGroup.add(jmenuItemScientific);
jmenuView.add(jmenuItemScientific);
if (jmenuItemNormal.isSelected() == false &&
jmenuItemScientific.isSelected() == false)
jmenuItemScientific.setSelected(true);
     jmenuHelp = new JMenu("Help");
     jmenuHelp.setFont(f121);
     jmenuHelp.setMnemonic(KeyEvent.VK_H);
     jmenuitemAbout = new JMenuItem("About Calculator");
     jmenuitemAbout.setFont(f12);
     jmenuHelp.add(jmenuitemAbout);
     JMenuBar menubar = new JMenuBar();
     menubar.add(jmenuFile);
     menubar.add(jmenuView);
     menubar.add(jmenuHelp);
     setJMenuBar(menubar);
     jmenuItemNormal.addActionListener(this);
     jmenuItemScientific.addActionListener(this);
     jmenuitemAbout.addActionListener(this);
     jmenuitemExit.addActionListener(this);
private void createDisplayPanel() {
     if (jlbOutput != null) {
     jlbOutput.removeAll();
     jlbOutput = new JLabel("0",JLabel.RIGHT);
     jlbOutput.setBackground(Color.WHITE);
     jlbOutput.setOpaque(true);
     // Add components to frame
     getContentPane().add(jlbOutput, BorderLayout.NORTH);
     jlbOutput.setVisible(true);
private void createMasterPanel() {
     if (jplMaster != null) {
     jplMaster.removeAll();
     jplMaster = new JPanel(new BorderLayout());
     createCalcButtons();
     jplMaster.add(jplBackSpace, BorderLayout.WEST);
     jplMaster.add(jplControl, BorderLayout.EAST);
     jplMaster.add(jplButtons, BorderLayout.SOUTH);
     ((JPanel)getContentPane()).revalidate();
     // Add components to frame
     getContentPane().add(jplMaster, BorderLayout.SOUTH);
     jplMaster.setVisible(true);
private void createCalcButtons() {
     int rows = 4;
     int cols = 5 + calcType/rows;
     jbnButtons = new JButton[31];
     // Create numeric Jbuttons
     for (int i=0; i<=9; i++) {
     // set each Jbutton label to the value of index
     jbnButtons[i] = new JButton(String.valueOf(i));
     // Create operator Jbuttons
     jbnButtons[10] = new JButton("+/-");
     jbnButtons[11] = new JButton(".");
     jbnButtons[12] = new JButton("=");
     jbnButtons[13] = new JButton("/");
     jbnButtons[14] = new JButton("*");
     jbnButtons[15] = new JButton("-");
     jbnButtons[16] = new JButton("+");
     jbnButtons[17] = new JButton("sqrt");
     jbnButtons[18] = new JButton("1/x");
     jbnButtons[19] = new JButton("%");
     jplBackSpace = new JPanel();
     jplBackSpace.setLayout(new GridLayout(1, 1, 2, 2));
     jbnButtons[20] = new JButton("Backspace");
     jplBackSpace.add(jbnButtons[20]);
     jplControl = new JPanel();
     jplControl.setLayout(new GridLayout(1, 2, 2 ,2));
     jbnButtons[21] = new JButton(" CE ");
     jbnButtons[22] = new JButton("C");
     jplControl.add(jbnButtons[21]);
     jplControl.add(jbnButtons[22]);
     //if (calcType == SCIENTIFIC) {
     jbnButtons[23] = new JButton("s");
     jbnButtons[24] = new JButton("t");
     jbnButtons[25] = new JButton("u");
     jbnButtons[26] = new JButton("v");
     jbnButtons[27] = new JButton("w");
     jbnButtons[28] = new JButton("x");
     jbnButtons[29] = new JButton("y");
     jbnButtons[30] = new JButton("z");
// Setting all Numbered JButton's to Blue. The rest to Red
     for (int i=0; i<jbnButtons.length; i++)     {
     //activate ActionListener
     System.out.println("add action listener: " + i);
     jbnButtons.addActionListener(this);
     //set button text font/colour
     jbnButtons[i].setFont(f12);
     jbnButtons[i].invalidate();
     if (i<10)
          jbnButtons[i].setForeground(Color.blue);
     else
          jbnButtons[i].setForeground(Color.red);
     // container for Jbuttons
     jplButtons = new JPanel(new GridLayout(rows, cols, 2, 2));
System.out.println("Cols: " + cols);
     //Add buttons to keypad panel starting at top left
     // First row
     // extra left buttons for scientific
     if (calcType == SCIENTIFIC) {
     System.out.println("Adding Scientific buttons");
     setSize(400, 217);
     setLocation(200, 250);
     jplButtons.add(jbnButtons[23]);
     jplButtons.add(jbnButtons[27]);
     } else {
     setSize(241, 217);
     setLocation(200, 250);
     for(int i=7; i<=9; i++)          {
     jplButtons.add(jbnButtons[i]);
     // add button / and sqrt
     jplButtons.add(jbnButtons[13]);
     jplButtons.add(jbnButtons[17]);
     // Second row
     // extra left buttons for scientific
     if (calcType == SCIENTIFIC) {
     System.out.println("Adding Scientific buttons");
     jplButtons.add(jbnButtons[24]);
     jplButtons.add(jbnButtons[28]);
     for(int i=4; i<=6; i++)     {
     jplButtons.add(jbnButtons[i]);
     // add button * and x^2
     jplButtons.add(jbnButtons[14]);
     jplButtons.add(jbnButtons[18]);
     // Third row
     // extra left buttons for scientific
     if (calcType == SCIENTIFIC) {
     System.out.println("Adding Scientific buttons");
     jplButtons.add(jbnButtons[25]);
     jplButtons.add(jbnButtons[29]);
     for( int i=1; i<=3; i++) {
     jplButtons.add(jbnButtons[i]);
     //adds button - and %
     jplButtons.add(jbnButtons[15]);
     jplButtons.add(jbnButtons[19]);
     //Fourth Row
     // extra left buttons for scientific
     if (calcType == SCIENTIFIC) {
     System.out.println("Adding Scientific buttons");
     jplButtons.add(jbnButtons[26]);
     jplButtons.add(jbnButtons[30]);
     // add 0, +/-, ., +, and =
     jplButtons.add(jbnButtons[0]);
     jplButtons.add(jbnButtons[10]);
     jplButtons.add(jbnButtons[11]);
     jplButtons.add(jbnButtons[16]);
     jplButtons.add(jbnButtons[12]);
     jplButtons.revalidate();
// Perform action
public void actionPerformed(ActionEvent e){
     double result = 0;
     if(e.getSource() == jmenuitemAbout) {
     //JDialog dlgAbout = new CustomABOUTDialog(this,
     //                              "About Java Swing Calculator", true);
     //dlgAbout.setVisible(true);
     } else if(e.getSource() == jmenuitemExit) {
     System.exit(0);
if (e.getSource() == jmenuItemNormal) {
calcType = NORMAL;
displayCalculator(title);
if (e.getSource() == jmenuItemScientific) {
calcType = SCIENTIFIC;
displayCalculator(title);
System.out.println("Calculator is set to "
+ (calcType == NORMAL?"Normal":"Scientific") + " :" + jbnButtons.length);
     // Search for the button pressed until end of array or key found
     for (int i=0; i<jbnButtons.length; i++)     {
     if(e.getSource() == jbnButtons[i]) {
          System.out.println(i);
          switch(i) {
          case 0:
               addDigitToDisplay(i);
               break;
          case 1:
               System.out.println("1");
               addDigitToDisplay(i);
               break;
          case 2:
               addDigitToDisplay(i);
               break;
          case 3:
               addDigitToDisplay(i);
               break;
          case 4:
               addDigitToDisplay(i);
               break;
          case 5:
               addDigitToDisplay(i);
               break;
          case 6:
               addDigitToDisplay(i);
               break;
          case 7:
               addDigitToDisplay(i);
               break;
          case 8:
               addDigitToDisplay(i);
               break;
          case 9:
               addDigitToDisplay(i);
               break;
          case 10:     // +/-
               processSignChange();
               break;
          case 11:     // decimal point
               addDecimalPoint();
               break;
          case 12:     // =
               processEquals();
               break;
          case 13:     // divide
               processOperator("/");
               break;
          case 14:     // *
               processOperator("*");
               break;
          case 15:     // -
               processOperator("-");
               break;
          case 16:     // +
               processOperator("+");
               break;
          case 17:     // sqrt
               if (displayMode != ERROR_MODE) {
               try {
                    if (getDisplayString().indexOf("-") == 0)
                    displayError("Invalid input for function!");
                    result = Math.sqrt(getNumberInDisplay());
                    displayResult(result);
               catch(Exception ex) {
                    displayError("Invalid input for function!");
                    displayMode = ERROR_MODE;
               break;
          case 18:     // 1/x
               if (displayMode != ERROR_MODE){
               try {
                    if (getNumberInDisplay() == 0)
                    displayError("Cannot divide by zero!");
                    result = 1 / getNumberInDisplay();
                    displayResult(result);
               catch(Exception ex) {
                    displayError("Cannot divide by zero!");
                    displayMode = ERROR_MODE;
               break;
          case 19:     // %
               if (displayMode != ERROR_MODE){
               try {
                    result = getNumberInDisplay() / 100;
                    displayResult(result);
               catch(Exception ex) {
                    displayError("Invalid input for function!");
                    displayMode = ERROR_MODE;
               break;
          case 20:     // backspace
               if (displayMode != ERROR_MODE) {
               setDisplayString(getDisplayString().substring(0,
               getDisplayString().length() - 1));
               if (getDisplayString().length() < 1)
                    setDisplayString("0");
               break;
          case 21:     // CE
               clearExisting();
               break;
          case 22:     // C
               clearAll();
               break;
void setDisplayString(String s) {
     jlbOutput.setText(s);
String getDisplayString () {
     return jlbOutput.getText();
void addDigitToDisplay(int digit) {
     if (clearOnNextDigit)
     setDisplayString("");
     String inputString = getDisplayString();
     if (inputString.indexOf("0") == 0) {
     inputString = inputString.substring(1);
     if ((!inputString.equals("0") || digit > 0)
                         && inputString.length() < MAX_INPUT_LENGTH) {
     setDisplayString(inputString + digit);
     displayMode = INPUT_MODE;
     clearOnNextDigit = false;
void addDecimalPoint() {
     displayMode = INPUT_MODE;
     if (clearOnNextDigit)
     setDisplayString("");
     String inputString = getDisplayString();
     // If the input string already contains a decimal point, don't
     // do anything to it.
     if (inputString.indexOf(".") < 0)
     setDisplayString(new String(inputString + "."));
void processSignChange() {
     if (displayMode == INPUT_MODE) {
     String input = getDisplayString();
     if (input.length() > 0 && !input.equals("0"))     {
          if (input.indexOf("-") == 0)
          setDisplayString(input.substring(1));
          else
          setDisplayString("-" + input);
     } else if (displayMode == RESULT_MODE) {
     double numberInDisplay = getNumberInDisplay();
     if (numberInDisplay != 0)
     displayResult(-numberInDisplay);
void clearAll() {
     setDisplayString("0");
     lastOperator = "0";
     lastNumber = 0;
     displayMode = INPUT_MODE;
     clearOnNextDigit = true;
void clearExisting() {
     setDisplayString("0");
     clearOnNextDigit = true;
     displayMode = INPUT_MODE;
double getNumberInDisplay()     {
     String input = jlbOutput.getText();
     return Double.parseDouble(input);
void processOperator(String op) {
     if (displayMode != ERROR_MODE) {
     double numberInDisplay = getNumberInDisplay();
     if (!lastOperator.equals("0")) {
          try {
          double result = processLastOperator();
          displayResult(result);
          lastNumber = result;
          catch (DivideByZeroException e)     {
          displayError("Cannot divide by zero!");
     } else {
     lastNumber = numberInDisplay;
     clearOnNextDigit = true;
     lastOperator = op;
void processEquals() {
     double result = 0;
     if (displayMode != ERROR_MODE){
     try {
          result = processLastOperator();
          displayResult(result);
     catch (DivideByZeroException e) {
          displayError("Cannot divide by zero!");
     lastOperator = "0";
double processLastOperator() throws DivideByZeroException {
     double result = 0;
     double numberInDisplay = getNumberInDisplay();
     if (lastOperator.equals("/")) {
     if (numberInDisplay == 0)
          throw (new DivideByZeroException());
     result = lastNumber / numberInDisplay;
     if (lastOperator.equals("*"))
     result = lastNumber * numberInDisplay;
     if (lastOperator.equals("-"))
     result = lastNumber - numberInDisplay;
     if (lastOperator.equals("+"))
     result = lastNumber + numberInDisplay;
     return result;
void displayResult(double result){
     setDisplayString(Double.toString(result));
     lastNumber = result;
     displayMode = RESULT_MODE;
     clearOnNextDigit = true;
void displayError(String errorMessage){
     setDisplayString(errorMessage);
     lastNumber = 0;
     displayMode = ERROR_MODE;
     clearOnNextDigit = true;
public static void main(String args[]) {
     Calculator calci = new Calculator("My Calculator");
     calci.displayCalculator("My Calculator");
System.out.println("Exitting...");
}     //End of Swing Calculator Class.
class DivideByZeroException extends Exception{
public DivideByZeroException() {
     super();
public DivideByZeroException(String s) {
     super(s);
class CustomABOUTDialog extends JDialog implements ActionListener {
JButton jbnOk;
CustomABOUTDialog(JFrame parent, String title, boolean modal){
     super(parent, title, modal);
     setBackground(Color.black);
     JPanel p1 = new JPanel(new FlowLayout(FlowLayout.CENTER));
     StringBuffer text = new StringBuffer();
     text.append("Calculator Information\n\n");
     text.append("Developer:     Hemanth\n");
     text.append("Version:     1.0");
     JTextArea jtAreaAbout = new JTextArea(5, 21);
     jtAreaAbout.setText(text.toString());
     jtAreaAbout.setFont(new Font("Times New Roman", 1, 13));
     jtAreaAbout.setEditable(false);
     p1.add(jtAreaAbout);
     p1.setBackground(Color.red);
     getContentPane().add(p1, BorderLayout.CENTER);
     JPanel p2 = new JPanel(new FlowLayout(FlowLayout.CENTER));
     jbnOk = new JButton(" OK ");
     jbnOk.addActionListener(this);
     p2.add(jbnOk);
     getContentPane().add(p2, BorderLayout.SOUTH);
     setLocation(408, 270);
     setResizable(false);
     addWindowListener(new WindowAdapter() {
          public void windowClosing(WindowEvent e) {
               Window aboutDialog = e.getWindow();
               aboutDialog.dispose();
     pack();
public void actionPerformed(ActionEvent e) {
     if(e.getSource() == jbnOk) {
     this.dispose();
Message was edited by:
dungorg

Swing related questions should be posted in the Swing forum.
After adding or removing components from a visible panel you need to use panel.revalidate() and sometimes panel.repaint();
If you need further help then you need to create a [url http://homepage1.nifty.com/algafield/sscce.html]Short, Self Contained, Compilable and Executable, Example Program (SSCCE) that demonstrates the incorrect behaviour, because I can't guess exactly what you are doing based on the information provided.
Don't forget to use the [url http://forum.java.sun.com/help.jspa?sec=formatting]Code Formatting Tags so the posted code retains its original formatting.

Updating JFrame content

I'm developing a Poker game.
I have done the GUI for the table, card, etc...
But now I don't really know how/where to put things like
- Request the system to deal cards
- Update the table GUI after each time a turn is dealt (hole cards, flop, turn, river, showdown)
My table GUI is in this form, I don't put my TableGUI code up here as it is too long.
TableGUI {
//Set up the table, display the table and actions panel (check, fold, bet, etc..)
actionPerformed{
   private static void createAndShowGUI() {
        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);
         TableGUI frame = new TableGUI();
   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();
}Could some one tell me how/where to put those above?
Thanks

for changing cards here's a simple demo
I used these 2 images (from google) - download/use at your own risk
http://www.markhope.com/imagebank/poker/cards/aceofclubs.gif
http://www.markhope.com/imagebank/poker/cards/aceofdiamonds.gif
click the button to change the card - you would also have a cardback.gif - for face down
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Testing
JLabel card = new JLabel(new ImageIcon("aceofclubs.gif"));
public void buildGUI()
    JPanel p = new JPanel(new GridBagLayout());
    p.add(card,new GridBagConstraints());
    JButton btn = new JButton("Next Card");
    JFrame f = new JFrame();
    f.getContentPane().add(p,BorderLayout.CENTER);
    f.getContentPane().add(btn,BorderLayout.SOUTH);
    f.setSize(600,400);
    f.setLocationRelativeTo(null);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
    btn.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent ae){
        card.setIcon(new ImageIcon("aceofdiamonds.gif"));
public static void main(String[] args)
    SwingUtilities.invokeLater(new Runnable(){
      public void run(){
        new Testing().buildGUI();
}for the betting I would image it would be set up to have the options in a popup,
or dialog, and then
actionPerformed(..) {
if (e.getSource() == raise) {
    user.money() = user.money() - raiseAmount;
    computerTurn();
else if (e.getSource() == call) {
    user.money() = user.money() - callAmount;
    determineWinner();
else if(e.getSource() == fold){
    newGame();//which would include dealCards()
}

Having Trouble Closing a JFrame With a Button Click in Swing

I am brand new to Java so this is probably something really stupid.
On my main form I have a table displaying records from a database. When you double click a record, it pops up a second form showing the details of that record. You can then edit the data in this second form and click a "save" button which saves the data to the database. I want this button to also close that second form, however in the button click event, the second form variable is null.
Here is some code showing the basic concept:
public class SampleForm {
    private JButton saveJobButton;
    private JFrame frame;
    private JFrame editDetailFrame;
    public static void main(String[] args) {
        SampleForm sample = new SampleForm();
        sample.createMainFrame();
    public void createMainFrame() {
        frame = new JFrame();
        JComponent panel = buildPanel();
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.getContentPane().add(panel);
        frame.pack();
        frame.setVisible(true);
    public void createEditFrame() {
        editDetailFrame = new JFrame();
        editDetailFrame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
        JComponent editPanel = new SampleForm().buildDetailPanel();
        editDetailFrame.getContentPane().add(editPanel);
        editDetailFrame.pack();
        editDetailFrame.setVisible(true);
        editDetailFrame.validate();
// save button
    private JButton getSaveJobButton() {
        if (saveJobButton == null) {
            saveJobButton = new JButton();
            saveJobButton.setText("Save Job");
            saveJobButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent e) {
                   .. saves data to database.
                    // here is where I thought the dispose() should go but the editDetailFrame is null at this point.
                    editDetailFrame.dispose();
        return saveJobButton;
    }Any assistance would be much appreciated.

That handles the NullPointer, but still doesn't close my second Frame. The editDetailFrame should not be null at this point as I am clicking a button on the editDetailFram itself so I think the problem is that I just don't have a reference to the actual object at that point and my variable is just an empty one.

Fit JButtons in a JFrame

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