Jsplitpane and jpanel

Hi
I am new to Java Swing and therefore ADF Swing. Therefore, this may sound like a basic question.
I have created a swing empty form. Is it possible to have a parent-child relationship between jsplitpane and containers?
For e.g. the design is - the left site on jsplitpane will house a jtree component, and right side of jsplitpane will have a jtabbedPane container.
how do I achieve above.. please advise.
Thanks,
Darsh

For me is not very clear your question. Do you want such as a jpanel in the top the your layout? Like a header?
The location of each component in your page layout will depend on the type of Layout Managers you will use.
What are you using?

Similar Messages

JSplitPane, JScrollPane, JPanel & resize

My program has 2 nested JSplitpanes, that divide the screen in 4 parts like a cross.
I added a JScrollPane to one of the quaters and added a JPanel to the JScrollPane. The JPanel uses a CardLayout since I want to switch the components that I show there.
One of the components I show on the JPanel is a JTree. If I expand the tree the panel becomes scrollable to show the whole tree. This is what I want because I want to be able to view the whole tree.
The problem is, that if I switch to another component on the panel the panel stays that large even though I just want it to have the visible size
This is how the panel looks like before switching to the tree and expanding it:
http://img272.imageshack.us/img272/8695/noscroll3zj.jpg
This is how the panel looks like after switching to the tree, expanding it and switching back:
http://img272.imageshack.us/img272/6690/scroll3ef.jpg
I want to restore the panel to its initial state but I cannot figure out how. Please help.

If I add a panel to the split pane (to make it card layout) I can't use it for scrolling anymoreThis simple example works for me:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SplitPaneCard extends JFrame
     JSplitPane splitPane;
     JPanel cards;
     public SplitPaneCard()
          splitPane = new JSplitPane();
          getContentPane().add(splitPane, BorderLayout.CENTER);
          JTextArea textArea1 = new JTextArea(5, 10);
          textArea1.setText("1\n2\n3\n4\n5\n6\n7");
          textArea1.setForeground( Color.RED );
          JScrollPane scrollPane1 = new JScrollPane( textArea1 );
          JTextArea textArea2 = new JTextArea(5, 10);
          textArea2.setText("1234567");
          textArea2.setForeground( Color.BLUE );
          JScrollPane scrollPane2 = new JScrollPane( textArea2 );
        cards = new JPanel( new CardLayout() );
        cards.add(scrollPane1, "red");
        cards.add(scrollPane2, "blue");
        splitPane.setRightComponent( cards );
          JPanel buttonPanel = new JPanel();
          getContentPane().add(buttonPanel, BorderLayout.SOUTH);
          JButton red = new JButton("Show Red Text Area");
          red.addActionListener( new ActionListener()
               public void actionPerformed(ActionEvent e)
                  CardLayout cl = (CardLayout)(cards.getLayout());
                  cl.show(cards, "red");
          buttonPanel.add(red);
          JButton blue = new JButton("Show Blue Text Area");
          blue.addActionListener( new ActionListener()
               public void actionPerformed(ActionEvent e)
                  CardLayout cl = (CardLayout)(cards.getLayout());
                  cl.show(cards, "blue");
          buttonPanel.add(blue);
     public static void main(String[] args)
          final SplitPaneCard frame = new SplitPaneCard();
          frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
          frame.pack();
          frame.setLocationRelativeTo( null );
          frame.setVisible(true);
}

What's difference between JPanel.remove(); and JPanel = null

nice day,
how can remove JPanel (including its JComponents), safe way, can you explain the difference between JPanel.remove () and JPanel = null,
1/ because if JPanel does not contain any static JComponents
2/ or any reference to static objects,
then works as well as JPanel.remove or JPanel = null,
or what and why preferred to avoid some action (to avoid to remove or to avoid to null)

mKorbel wrote:
nice day,
how can remove JPanel (including its JComponents), safe way, can you explain the difference between JPanel.remove () and JPanel = null, Remove the JPanel from the container it was part of and make sure you do not keep any references to it from your own classes. Don't make it any more difficult than it has to be.

Resizing JFrames and JPanels !!!

Hi Experts,
I had one JFrame in which there are three objects, these objects are of those classes which extends JPanel. So, in short in one JFrame there are three JPanels.
My all JPanels using GridBagLayout and JFrame also using same. When I resize my JFrame ,it also resize my all objects.
My Problem is how should i allow user to resize JPanels in JFrame also?? and if user is resizing one JPanel than other should adjust according to new size ...
Plese guide me, how should i do this ...
Thanknig Java Community,
Dhwanit Shah

Hey there, thanx for your kind intereset.
Here is sample code .
In which there is JFrame, JPanel and in JPanel ther is one JButton.Jpanel is added to JFrame.
I want to resize JPanel within JFrame,I am able to do resize JFrame and JPanel sets accroding to it.
import java.awt.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;
public class FramePanel extends JFrame {
JPanel contentPane;
GridBagLayout gridBagLayout1 = new GridBagLayout();
public FramePanel() {
try {
jbInit();
catch(Exception e) {
e.printStackTrace();
public static void main(String[] args) {
FramePanel framePanel = new FramePanel();
private void jbInit() throws Exception {
contentPane = (JPanel) this.getContentPane();
contentPane.setLayout(gridBagLayout1);
this.setSize(new Dimension(296, 284));
this.setTitle("Frame and Panel Together");
MyPanel myPanel = new MyPanel();
this.getContentPane().add(myPanel);
this.setVisible(true);
class MyPanel extends JPanel {
public MyPanel() {
this.setSize(200,200);
this.setLayout(new FlowLayout());
this.setBackground(Color.black);
this.setVisible(true);
this.add(new JButton("Dhwanit Shah"));
I think i might explained my problem
Dhwanit Shah
[email protected]

Inserting a Gui program using JFrames and JPanel

I'm trying to insert a chat program into a game that I've created! The chat program is using JFrames and JPanels. I want to insert this into a GridLayout and Panel. How can I go about doing this?

whatever is in the frame's contentPane now, you add to a separate JPanel.
you also add your chat stuff to the separate panel
the separate panel is added to the frame as the content pane

JTextArea as ListCellRenderer in JPanel with JSplitPane and text wrapping

Hi.
I have problem with JTextArea text wrapping. The JTextArea is used as ListCellRenderer in JList and it has set:
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);I can dynamically add new Notes, modify and remove notes on JList. The capacity of the Text is various so the size of cells is various.
The JList is in JScrollPane configured like this:
JList notesList = new JList();
JScrollPane scrollPane = new JScrollPane(
                    JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
                    JScrollPane.HORIZONTAL_SCROLLBAR_NEVER
scrollPane.setViewportView(notesList);This scrollPane is put on the left component in the JSplitPane.
When I put one note with any capacity I want, word wrapping works great even if I move the splitter. The size of cells in JList changes as I want. When JList has more width the cells have less height, when JList has less width the cells height grows because of text wrapping.
Problem
Sometimes and I don't know when and why the cells size is fixed.
I put new note to the list, JList lays the cell, calculate the size and disply it. It is good but when I move splitter the size of the cell is the same. It seems that during moving the splitter the JTextArea doesn't calculate their size.
I would like in every cell in JList to see whole text wrapped. When I make more width by slider I would like to see whole text with less number of rows. When I make less width with the slider I want to see whole text wrapped and more higher cells.
Can someone help me where to looking for ideas.

Hi.
I have problem with JTextArea text wrapping. The JTextArea is used as ListCellRenderer in JList and it has set:
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);I can dynamically add new Notes, modify and remove notes on JList. The capacity of the Text is various so the size of cells is various.
The JList is in JScrollPane configured like this:
JList notesList = new JList();
JScrollPane scrollPane = new JScrollPane(
                    JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
                    JScrollPane.HORIZONTAL_SCROLLBAR_NEVER
scrollPane.setViewportView(notesList);This scrollPane is put on the left component in the JSplitPane.
When I put one note with any capacity I want, word wrapping works great even if I move the splitter. The size of cells in JList changes as I want. When JList has more width the cells have less height, when JList has less width the cells height grows because of text wrapping.
Problem
Sometimes and I don't know when and why the cells size is fixed.
I put new note to the list, JList lays the cell, calculate the size and disply it. It is good but when I move splitter the size of the cell is the same. It seems that during moving the splitter the JTextArea doesn't calculate their size.
I would like in every cell in JList to see whole text wrapped. When I make more width by slider I would like to see whole text with less number of rows. When I make less width with the slider I want to see whole text wrapped and more higher cells.
Can someone help me where to looking for ideas.

JSplitPane and Jtree

Hi all,
in my window I've got a JSplitPane with the left component that is a JScrollPane with a Jtree (used as a menu), while in the right side a customized JPanel that changes depending on the selection in the tree on the left.
My panels are initially created as follows:
     this.splitter = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
     this.splitter.setOneTouchExpandable(true);
JScrollPane leftPanel = new JScrollPane( this.menuTree );
          leftPanel.setMinimumSize( new Dimension(300,300) );
          leftPanel.setMaximumSize(leftPanel.getMinimumSize());
          // add the leftt and right panels
          this.splitter.setLeftComponent( leftPanel );
          this.imagePanel = new ImagePanel(ComponentBuilder.getLogoPath());
          this.rightPanel = this.imagePanel;
          this.splitter.setRightComponent(this.rightPanel);
          // add the splitter to myself
          this.add(new JScrollPane(this.splitter));where the imagepanel is a working panel that shows the project logo. Now what happens is that:
1) the logo is cutted to a size I don't know how is calculated, since the image panel is working fine (if I place on a separate window I can see the image right)
2) most important when a user selects something in the tree on the left panel, so the right panel changes, the left panel is moved around the window depending on the size of the right panel.
Is it possible to fix the left panel not only as size, but also in the position of the window, thus the remaining part of the window will be occupied by the right panel without moving the left one? In my frame I'm using a BorderLayout, and the panel containing the splitpane is set at the center (no components on the right and on the left).
Thanks,
Luca

Thanks for your reply, but the only thing I noticed is that the code you're showing works a little more with sizes, that is something I've already tried. By the way, the following is a running example that loads a tree/menu and the logo.png image.
Any idea about its behaviour?
Thanks,
Luca
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.util.*;
import java.awt.image.*;
class ImagePanel extends JPanel implements ImageObserver
     * The image to display
    protected Image image=null;
     * This flag indicates if the image is complete or not.
    protected boolean isComplete=false;
     * The dimension of the panel.
    protected int width=0,height=0;
     * This is the message to display during loading.
    protected String message="Loading...";
     * Default constructor.
     * @param image the image object.
    public ImagePanel(Image image)
          super();
          this.image=image;
     * Overloaded constructor. It try to load the image itself. You should use
     * this to avoid image flicking problems. This method use all the
     * capabilities of the ImageObserver.
     * @param image the image file name
    public ImagePanel(String image) {
          super();
          /* now load the image */
          Toolkit tk=Toolkit.getDefaultToolkit();
          this.image=tk.getImage(image);
          /* use the media tracker to wait untill the image is not loaded */
          try{
              MediaTracker tracker=new MediaTracker(this);
              tracker.addImage(this.image,0);
              tracker.waitForID(0);
              this.isComplete=true;
              /* now that the image is fully loaded I need to resize the panel to
              the size of the image */
              this.width=this.image.getWidth(this);
              this.height=this.image.getHeight(this);
              this.setSize(width,height);
              this.setMinimumSize(getSize());
              this.setMaximumSize(getSize());
              this.setVisible(true);
          catch(InterruptedException e){
              this.message="Exception during loading process!";
              this.isComplete=false;
     * Draw the image.
    public void paint(Graphics device)   {
          super.paint(device);
          if(this.isComplete==true)     {
              device.drawImage(this.image,0,0,this.width,this.height,this);
          else     {
              device.setColor(Color.RED);
              device.drawString(this.message,20,20);
     * The update image method. This method is called for every update and or
     * error.
    public boolean imageUpdate(Image image,int infoFlags, int x, int y,
                    int width, int height)
          if((infoFlags & ALLBITS)==0)
              /* the image is complete */
              this.isComplete=true;
              repaint();
              this.setVisible(true);
              return false;
          else
          if((infoFlags & ERROR)==0 || (infoFlags & ABORT)==0 )
              /* error or abort */
              this.isComplete=false;
              this.message="Error during load process (or abort)";
              this.repaint();
              return true;
          else
          if((infoFlags & SOMEBITS)==0)
              /* some other data loaded, show the loading process percent */
              int originalWidth=this.image.getWidth(this);
              int originalHeight=this.image.getHeight(this);
              int currentWidth=image.getWidth(this);
              int currentHeight=image.getHeight(this);
              /* now calculate the total of pixels */
              long originalTotal=originalWidth*originalHeight;
              long currentTotal=currentWidth*currentHeight;
              /* now calculate the percent */
              float percent=(float)currentTotal/(float)originalTotal *100;
              /* set the string */
              this.message="Loading progress: "+(int)percent+" % done";
              this.repaint();
              return true;
          return true;
public class MainPanel extends JPanel {
      * The split pane used for this panel.
     protected JSplitPane splitter = null;
      * The menu tree of this panel.
     protected JTree menuTree = null;
      * The parentFrame frame of this panel
     protected JFrame parentFrame = null;
      * The panel on the right of the window.
     protected JComponent rightPanel = null;
      * The menuTreeRoot node of the menu.
     protected DefaultMutableTreeNode menuTreeRoot = null;
      * The action menu of the JFrame that contains this panel. Such menu is changed depending on the panel
      * shown on the right panel.
     protected JMenu actionMenu = null;
      * The image panel with the image of the logo.
     protected ImagePanel imagePanel = null;
     public final String ROOT_STRING = "Gestione delle risorse umane";
     public final String LEVEL1A_STRING = "Parametrizzazione";
     public final String LEVEL2AA_STRING = "Competenze & Famiglie di competenze";
     public final String LEVEL2AB_STRING = "Gestione dei ruoli";
     public final String LEVEL2AC_STRING = "Associazione ruolo-competenza";
     public final String LEVEL1B_STRING   = "Varie";
     public final String LEVEL2BB_STRING = "Province";
     public final String LEVEL2BC_STRING = "Citta'";
     public final String LEVEL2BD_STRING = "Livelli di istruzione";
     public final String LEVEL2BE_STRING = "Livelli di competenza";
     public final String LEVEL3A_STRING   = "Personale";
     public final String LEVEL3AA_STRING = "Anagrafica di base";
     public final String LEVEL3AB_STRING = "Ruoli, Competenze e Gradi di Istruzione";
     public final String LEVEL3AC_STRING = "Storia delle valutazioni delle competenze";
     public final String LEVEL3AD_STRING = "Valutazione";
      * Default constructor.
      * @param parentFrame the jframe that contains this panel
     public MainPanel(JFrame parent, JMenu actionMenu){
          super();
          this.parentFrame = parent;
          this.initGUI();
          this.actionMenu = actionMenu;
      * Shows the components on the main panel.
     public synchronized void initGUI(){
          // create the split pane
          this.splitter = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
          this.splitter.setOneTouchExpandable(true);
          //this.splitter.setResizeWeight(0);                    // the right panel gets all the extra space
          // create the left panel with the tree
          DefaultMutableTreeNode root = new DefaultMutableTreeNode(ROOT_STRING);
               DefaultMutableTreeNode level1a = new DefaultMutableTreeNode(LEVEL1A_STRING);
                    ContainerTreeNode level2aa = new ContainerTreeNode(LEVEL2AA_STRING);     // skills and families
               DefaultMutableTreeNode level2ab = new DefaultMutableTreeNode(LEVEL2AB_STRING);
                    DefaultMutableTreeNode level2ac = new DefaultMutableTreeNode(LEVEL2AC_STRING);
               DefaultMutableTreeNode level1b = new DefaultMutableTreeNode(LEVEL1B_STRING);
                    DefaultMutableTreeNode level2bb = new DefaultMutableTreeNode(LEVEL2BB_STRING);
                    DefaultMutableTreeNode level2bc = new DefaultMutableTreeNode(LEVEL2BC_STRING);
                    DefaultMutableTreeNode level2bd = new DefaultMutableTreeNode(LEVEL2BD_STRING);
                    DefaultMutableTreeNode level2be = new DefaultMutableTreeNode(LEVEL2BE_STRING);
               DefaultMutableTreeNode level3a = new DefaultMutableTreeNode(LEVEL3A_STRING);
                    DefaultMutableTreeNode level3aa = new DefaultMutableTreeNode(LEVEL3AA_STRING);
                    DefaultMutableTreeNode level3ab = new DefaultMutableTreeNode(LEVEL3AB_STRING);
                    DefaultMutableTreeNode level3ac = new DefaultMutableTreeNode(LEVEL3AC_STRING);
                    DefaultMutableTreeNode level3ad = new DefaultMutableTreeNode(LEVEL3AD_STRING);
          // create the tree
          this.menuTreeRoot = root;
          level2ab.add(level2ac);
          level1a.add(level2aa);
          level1b.add(level2bc);
          level1b.add(level2bb);
          level1b.add(level2bd);
          level1b.add(level2be);
          level3a.add(level3aa);
          level3a.add(level3ab);
          level3a.add(level3ac);
          level3a.add(level3ad);
          root.add(level3a);
          root.add(level2ab);
          root.add(level1a);
          root.add(level1b);
          this.menuTree = new JTree(root);
          this.menuTree.setSize(200,200);
          JScrollPane leftPanel = new JScrollPane( this.menuTree );
          leftPanel.setMinimumSize( new Dimension(300,300) );     // it does not affects the dimension, but avoid to resize the left panel
          leftPanel.setMaximumSize(leftPanel.getMinimumSize());
          // add the leftt and right panels
          this.splitter.setLeftComponent( leftPanel );
          this.imagePanel = new ImagePanel("logo.png");
          this.rightPanel = this.imagePanel;
          this.rightPanel.setSize(400,400);
          this.splitter.setRightComponent(this.rightPanel);
          // add the splitter to myself
          this.add(new JScrollPane(this.splitter));
     public static void main(String argv[]){
         JFrame f = new JFrame();
         f.setSize(400,400);
         f.add(new MainPanel(f,null));
         f.setVisible(true);
}

Having trouble with nested JSplitPanes and am on a deadline...

My demo code is pasted below. I tried to make it as close to my app environment as possible without making it too huge, it's already long enough as it is. Anyway, this should run without any imports needed and as a standalone. The problem is this: start the program, click "Hide Middle Panel". Then move the remaining divider over to the left a ways. Now click on "Show Middle Panel". Then action listener resets the right divider that was moved back to it's original location (desired), but even though it is setting the left divider to .5 after the right divider has been moved, it still uses the old width to determine the placement, so the result is that the left divider is out of place.
Is this a bug in JSplitPane? Or is it something I am doing wrong?
In my application, I have also written a similar handling of a resize event, which basically just sets the left divider to .5 again. When the split panes are in their invalid state, if I do nothing but resize slightly, the split panes right themselves. However, calling the method that is handling the resize event after setting the divider locations does not make a difference, nor does calling revalidate or repaint.
Thanks in advance,
Tonya
public class TestNestedSplitPane extends javax.swing.JFrame {
    /** Creates new form testNestedSplitPane */
    private TestNestedSplitPane() {
    public static TestNestedSplitPane instance() {
        if (null == instance) {
            instance = new TestNestedSplitPane();
            instance.initComponents();
        return instance;
    private void initComponents() {
        java.awt.GridBagConstraints gridBagConstraints;
        splitPaneContainerPanel = new javax.swing.JPanel();
        splitPaneContainerPanel.setPreferredSize(new java.awt.Dimension(500, 280));
        leftPanel = new javax.swing.JPanel();
        leftPanel.setBackground(java.awt.Color.BLUE);
        middlePanel = new javax.swing.JPanel();
        middlePanel.setBackground(java.awt.Color.GREEN);
        rightPanel = new javax.swing.JPanel();
        rightPanel.setBackground(java.awt.Color.RED);
        innerSplitPane = new javax.swing.JSplitPane(javax.swing.JSplitPane.HORIZONTAL_SPLIT, true, leftPanel, middlePanel);
        outerSplitPane = new javax.swing.JSplitPane(javax.swing.JSplitPane.HORIZONTAL_SPLIT, true, innerSplitPane, rightPanel);
        innerSplitPane.setDividerLocation(((int)splitPaneContainerPanel.getPreferredSize().getWidth()) * 1/3);
        outerSplitPane.setDividerLocation(((int)splitPaneContainerPanel.getPreferredSize().getWidth()) * 2/3);
        buttonContainerPanel = new javax.swing.JPanel();
        hideButton = new javax.swing.JButton();
        hideButton.addActionListener(OutsideListener.instance());
        getContentPane().setLayout(new java.awt.GridBagLayout());
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
        splitPaneContainerPanel.setLayout(new java.awt.BorderLayout());
        outerSplitPane.setContinuousLayout(true);
        outerSplitPane.setOneTouchExpandable(true);
        innerSplitPane.setContinuousLayout(true);
        innerSplitPane.setOneTouchExpandable(true);
        outerSplitPane.setLeftComponent(innerSplitPane);
        splitPaneContainerPanel.add(outerSplitPane, java.awt.BorderLayout.CENTER);
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 0;
        gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
        gridBagConstraints.weightx = 1.0;
        gridBagConstraints.weighty = 1.0;
        getContentPane().add(splitPaneContainerPanel, gridBagConstraints);
        hideButton.setText("Hide Middle Panel");
        buttonContainerPanel.add(hideButton);
        java.awt.Toolkit tk = java.awt.Toolkit.getDefaultToolkit();
        java.awt.Dimension d = tk.getScreenSize();
        setSize(500, 300);
        int screenHeight = d.height;
        int screenWidth = d.width;
        setLocation((screenWidth-500)/2, (screenHeight-300)/2);
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 1;
        gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
        gridBagConstraints.weightx = 1.0;
        getContentPane().add(buttonContainerPanel, gridBagConstraints);
        pack();
    /** Exit the Application */
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
     * @param args the command line arguments
    public static void main(String args[]) {
        TestNestedSplitPane.instance().show();
    private static TestNestedSplitPane instance = null;
    public javax.swing.JButton hideButton = null;
    private javax.swing.JPanel splitPaneContainerPanel = null;
    private javax.swing.JPanel buttonContainerPanel = null;
    public javax.swing.JSplitPane outerSplitPane = null;
    public javax.swing.JSplitPane innerSplitPane = null;
    public javax.swing.JPanel leftPanel = null;
    public javax.swing.JPanel middlePanel = null;
    public javax.swing.JPanel rightPanel = null;
class OutsideListener implements java.awt.event.ActionListener {
    private static OutsideListener instance = null;
    private OutsideListener() {
    public static OutsideListener instance() {
        if (null == instance) {
            instance = new OutsideListener();
        return instance;
    public void actionPerformed(java.awt.event.ActionEvent e) {
        if (TestNestedSplitPane.instance().hideButton.getText().equalsIgnoreCase("Hide Middle Panel")) {
            TestNestedSplitPane.instance().middlePanel.setVisible(false);
            TestNestedSplitPane.instance().outerSplitPane.setDividerLocation(.67);
            TestNestedSplitPane.instance().hideButton.setText("Show Middle Panel");
        } else if (TestNestedSplitPane.instance().hideButton.getText().equalsIgnoreCase("Show Middle Panel")) {
            TestNestedSplitPane.instance().middlePanel.setVisible(true);
            TestNestedSplitPane.instance().outerSplitPane.setDividerLocation(.67);
            TestNestedSplitPane.instance().outerSplitPane.revalidate();
            TestNestedSplitPane.instance().innerSplitPane.setDividerLocation(.5);
            TestNestedSplitPane.instance().hideButton.setText("Hide Middle Panel");
}

However, I still get totally confused about the difference between validate() and revalidate().Same here. There seems to be no consistency. One combination of components will
respond to revalidate(), another combination will not.
Did you come across this solution by trying various combinations of validate(), revalidate(), repaint()?I (generally) find either revalidate() (on its own), or validate() and repaint() (combined) work
In this case, after spotting the revalidate(), validate()/repaint() was the first change I tried.
http://forum.java.sun.com/thread.jspa?threadID=583383Interesting discussion - I'll have bit more of a look through my swing books/notes and if I
find anything interesting I'll post back.

Formlayout and JPanel

Hi,
Its been some time since I last programmed with Java and I am happy to revisit it, but my knowledge is somewhat rusty. This is so elementary I feel a bit dim for asking it!
I'm trying to create a JApplet which will have two JPanels next to each other, in a FormLayout. The first
JPanel will be something of a canvas allowing the applet to draw images on it; the second is an image that
the routine uploads.
Below is the bare bones programme. I can get the second JPanel to display the image, but the first won't show;
at the moment, its just a simple override of paintComponent showing a green circle to ensure that I can display
something on screen. Is there anything obviously wrong?
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class DeaApplet extends JApplet
zapPanel zap_panel;
deaPanel dea_panel;
public void init ()
    Container content_pane = getContentPane ();
    // Grab the image.
    Image img = getImage (getCodeBase (), "zap_perch.PNG");
    // Create an instanceof DrawingPanel
    zap_panel = new zapPanel (img);
    dea_panel = new deaPanel();
    dea_panel.setSize(100,100);
    dea_panel.setVisible(true);
    // Add the DrawingPanel to the content pane.
    content_pane.add (dea_panel);
    content_pane.add (zap_panel);
    content_pane.setVisible(true);
class deaPanel extends JPanel
   deaPanel ()
   public void paintComponent(Graphics g)
       //super.paintComponent(g);
    int width = getWidth();
    int height = getHeight();
    //System.out.println(width);
    g.setColor( Color.GREEN );
    g.drawOval(0, 0, width, height);
class zapPanel extends JPanel implements MouseListener
Image img;
zapPanel (Image img)
{ this.img = img;
public void paintComponent (Graphics g) {
   super.paintComponent (g);
   // Use the image width & height to find the starting point
   int imgX = getSize ().width/2 - img.getWidth (this);
   int imgY = getSize ().height/2 - img.getHeight (this);
   //Draw image centered in the middle of the panel
   g.drawImage (img, imgX, imgY, this);
} // paintComponent
public void mousePressed (MouseEvent e)
public void mouseReleased (MouseEvent e)
public void mouseEntered (MouseEvent e)
public void mouseExited (MouseEvent e)
public void mouseClicked (MouseEvent e)
    //saySomething ("Mouse clicked (# of clicks: "
     //             + e.getClickCount () + ")", e);
    // Between 62,53 and 127,202
      int mx = e.getX();
      int my = e.getY();
}

I'm trying to create a JApplet which will have two JPanels next to each other, in a FormLayout.1. FormLayout isn't a standard JDK class. Why not use one of the standard layouts? For just adding two components side by side, many of them would fit the bill. Or use a JSplitPane if you want the contents to be resizable.
2. The code you posted doesn't in fact use any FormLayout but rather the JApplet's default BorderLayout. So it's expected that you could see only the last component added to the default location of CENTER.\
3. setSize is redundant and undesired when the component is added to a container with a non-null layout manager.

JSplitPane and JTable

Hi
I have a JSplitPane containing two instances of an extended JPanel. The JPanel conatins some buttons, a combobox and a JTable. The problem is that on startup a small part of the right side of the JPanel is'nt showing. Only if I maximize the window.
The JFrame that holds the splitpane has ha fixed width: setBounds(10, 10, 750, 400)
The splitpane has setResizeWeight(0.5);
I've tried to call revalidate on the splitpane but it did'nt work.
Any ideas?

Apart from this, it has worked fine with FormLayout. Few lines of code, easy to change.
I'm going to experiment a bit, before I give up.
FormLayout layout = new FormLayout(
                    "left:default:grow, 2dlu, left:default, 2dlu, left:default,2dlu",
                    "default, 2dlu, default, 2dlu, default");
          CellConstraints cc = new CellConstraints();
          setLayout(layout);
          add(boxPath, cc.xy(1,1));
          add(btnReRead, cc.xy(3,1));
          add(btnRoot, cc.xy(5,1));
          add(navScroll, cc.xywh(1,3,5,1));
          add(txtCommand, cc.xywh(1,5,3,1));
          add(btnExecute, cc.xy(5,5));
                            System.out.println(getPreferredSize());In eclipse the preferred size is width=379,height=453
On the commandline it is width=457,height=453

Advance level drawing problem with Jframe and JPanel need optimize sol?

Dear Experts,
I m trying to create a GUI for puzzle game following some kind of "game GUI template", but i have problems in that,so i tried to implement that in various ways after looking on internet and discussions about drawing gui in swing, but i have problem with both of these, may be i m doing some silly mistake, which is still out of my consideration. please have a look at these two and recommend me one of them, which is running without problems (flickring and when you enlarge window the board draw copies (tiled) everywhere,
Note: i don't want to inherit jpanel or Jframe
here is my code : import java.awt.BorderLayout;
public class GameMain extends JFrame {
     private static final long serialVersionUID = 1L;
     public int mX, mY;
     int localpoints = 0;
     protected static JTextField[][] squares;
     protected JLabel statusLabel = new JLabel("jugno");
     Label lbl_score = new Label("score");
     Label lbl_scorelocal = new Label("local score");
     protected static TTTService remoteTTTBoard;
     // Define constants for the game
     static final int CANVAS_WIDTH = 800; // width and height of the game screen
     static final int CANVAS_HEIGHT = 600;
     static final int UPDATE_RATE = 4; // number of game update per second
     static State state; // current state of the game
     private int mState;
     // Handle for the custom drawing panel
     private GameCanvas canvas;
     // Constructor to initialize the UI components and game objects
     public GameMain() {
          // Initialize the game objects
          gameInit();
          // UI components
          canvas = new GameCanvas();
          canvas.setPreferredSize(new Dimension(CANVAS_WIDTH, CANVAS_HEIGHT));
          this.setContentPane(canvas);
          this.setDefaultCloseOperation(EXIT_ON_CLOSE);
          this.pack();
          this.setTitle("MY GAME");
          this.setVisible(true);
     public void gameInit() {
     // Shutdown the game, clean up code that runs only once.
     public void gameShutdown() {
     // To start and re-start the game.
     public void gameStart() {
     private void gameLoop() {
     public void keyPressed(KeyEvent e) {
     public void keyTyped(KeyEvent e) {
     public void gameKeyReleased(KeyEvent e) {
          PuzzleBoard bd = getBoard();
          for (int row = 0; row < 4; ++row) {
               for (int col = 0; col < 4; ++col) {
                    if (e.getSource() == squares[row][col]) {
                         if (bd.isOpen(col, row)) {
                              lbl_score.setText("Highest Score = "
                                        + Integer.toString(bd.getPoints()));
                              setStatus1(bd);
                              pickSquare1(col, row, squares[row][col].getText()
                                        .charAt(0));
     protected void pickSquare1(int col, int row, char c) {
          try {
               remoteTTTBoard.pick(col, row, c);
          } catch (RemoteException e) {
               System.out.println("Exception: " + e.getMessage());
               e.printStackTrace();
               System.exit(1);
     // method "called" by remote object to update the state of the game
     public void updateBoard(PuzzleBoard new_board) throws RemoteException {
          String s1;
          for (int row = 0; row < 4; ++row) {
               for (int col = 0; col < 4; ++col) {
                    squares[row][col].setText(new_board.ownerStr(col, row));
          lbl_score.setText("Highest Score = "
                    + Integer.toString(new_board.getPoints()));
          setStatus1(new_board);
     protected void setStatus1(PuzzleBoard bd) {
          boolean locals = bd.getHave_winner();
          System.out.println("local win" + locals);
          if (locals == true) {
               localpoints++;
               System.out.println("in condition " + locals);
               lbl_scorelocal.setText("Your Score = " + localpoints);
          lbl_score
                    .setText("Highest Score = " + Integer.toString(bd.getPoints()));
     protected PuzzleBoard getBoard() {
          PuzzleBoard res = null;
          try {
               res = remoteTTTBoard.getState();
          } catch (RemoteException e) {
               System.out.println("Exception: " + e.getMessage());
               e.printStackTrace();
               System.exit(1);
          return res;
     /** Custom drawing panel (designed as an inner class). */
     class GameCanvas extends JPanel implements KeyListener {
          /** Custom drawing codes */
          @Override
          public void paintComponent(Graphics g) {
               // setOpaque(false);
               super.paintComponent(g);
               // main box; everything placed in this
               // JPanel box = new JPanel();
               setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
               // add(statusLabel, BorderLayout.NORTH);
               // set up the x's and o's
               JPanel xs_and_os = new JPanel();
               xs_and_os.setLayout(new GridLayout(5, 5, 0, 0));
               squares = new JTextField[5][5];
               for (int row = 0; row < 5; ++row) {
                    for (int col = 0; col < 5; ++col) {
                         squares[row][col] = new JTextField(1);
                         squares[row][col].addKeyListener(this);
                         if ((row == 0 && col == 1) || (row == 2 && col == 3)
                         || (row == 1 && col == 4) || (row == 4 && col == 4)
                                   || (row == 4 && col == 0))
                              JPanel p = new JPanel(new BorderLayout());
                              JLabel label;
                              if (row == 0 && col == 1) {
                                   label = new JLabel("1");
                                   label.setHorizontalAlignment(JLabel.LEFT);
                                   label.setVerticalAlignment(JLabel.TOP);
                              else if (row == 4 && col == 0) {// for two numbers or
                                   // two
                                   // blank box in on row
                                   label = new JLabel("2");
                                   label.setHorizontalAlignment(JLabel.LEFT);
                                   label.setVerticalAlignment(JLabel.TOP);
                              else if (row == 1 && col == 4) {
                                   label = new JLabel("3");
                                   label.setHorizontalAlignment(JLabel.LEFT);
                                   label.setVerticalAlignment(JLabel.TOP);
                              else if (row == 4) {
                                   label = new JLabel("4");
                                   label.setHorizontalAlignment(JLabel.LEFT);
                                   label.setVerticalAlignment(JLabel.TOP);
                              else {
                                   label = new JLabel("5");
                                   label.setHorizontalAlignment(JLabel.LEFT);
                                   label.setVerticalAlignment(JLabel.TOP);
                              label.setOpaque(true);
                              label.setBackground(squares[row][col].getBackground());
                              label.setPreferredSize(new Dimension(label
                                        .getPreferredSize().width, squares[row][col]
                                        .getPreferredSize().height));
                              p.setBorder(squares[row][col].getBorder());
                              squares[row][col].setBorder(null);
                              p.add(label, BorderLayout.WEST);
                              p.add(squares[row][col], BorderLayout.CENTER);
                              xs_and_os.add(p);
                         } else if ((row == 2 && col == 1) || (row == 1 && col == 2)
                                   || (row == 3 && col == 3) || (row == 0 && col == 3)) {
                              xs_and_os.add(squares[row][col]);
                              // board[ row ][ col ].setEditable(false);
                              // board[ row ][ col ].setText("");
                              squares[row][col].setBackground(Color.RED);
                              squares[row][col].addKeyListener(this);
                         } else {
                              squares[row][col] = new JTextField(1);
                              // squares[row][col].addActionListener(this);
                              squares[row][col].addKeyListener(this);
                              xs_and_os.add(squares[row][col]);
               this.add(xs_and_os);
               this.add(statusLabel);
               this.add(lbl_score);
               this.add(lbl_scorelocal);
          public void keyPressed(KeyEvent e) {
          public void keyReleased(KeyEvent e) {
               gameKeyReleased(e);
          public void keyTyped(KeyEvent e) {
     // main
     public static void main(String[] args) {
          SwingUtilities.invokeLater(new Runnable() {
               @Override
               public void run() {
                    new GameMain();
thanks a lot for your time , consideration and efforts.
jibby
Edited by: jibbylala on Sep 20, 2010 6:06 PM

jibbylala wrote:
thanks for mentioning as i wasn't able to write complete context here.Yep thanks camickr. I think that Darryl's succinct reply applies here as well.

Problem with JFrame and JPanel

Okay, well I'm busy doing a lodge management program for a project and I have programmed this JFrame
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class FinalTest extends JFrame
     public JPanel contentPane;
     public JImagePanel imgPanel;
     private JLabel[] cottageIcon;
     private boolean keepMoving;
     private int selectedCottage;
     public FinalTest()
          super();
          initializeComponent();
          addActionListeners();
          this.setVisible(true);
     private void initializeComponent()
          contentPane = (JPanel)getContentPane();
          contentPane.setLayout(null);
          imgPanel = new JImagePanel("back.png");
           imgPanel.setLayout(null);
          imgPanel.setBackground(new Color(1, 0, 0));
               addComponent(contentPane, imgPanel, 10,10,imgPanel.getImageWidth(),imgPanel.getImageHeight());
          cottageIcon = new JLabel[6];
          keepMoving = true;
          selectedCottage = 0;
          cottageIcon[0] = new JLabel();
          //This component will never be added or shown, but needs to be there to cover for no cottage selected
          for(int a = 1; a < cottageIcon.length; a++)
               cottageIcon[a] = new JLabel("C" + (a));
               cottageIcon[a].setBackground(new Color(255, 0, 0));
                cottageIcon[a].setHorizontalAlignment(SwingConstants.CENTER);
                cottageIcon[a].setHorizontalTextPosition(SwingConstants.LEADING);
                cottageIcon[a].setForeground(new Color(255, 255, 255));
                cottageIcon[a].setOpaque(true);
                addComponent(imgPanel,cottageIcon[a],12,(a-1)*35 + 12,30,30);
          this.setTitle("Cottage Chooser");
          this.setLocationRelativeTo(null);
          this.setSize(new Dimension(540, 430));
     private void addActionListeners()
          imgPanel.addMouseListener(new MouseAdapter()
               public void mousePressed(MouseEvent e)
                    imgPanel_mousePressed(e);
               public void mouseReleased(MouseEvent e)
                    imgPanel_mouseReleased(e);
               public void mouseEntered(MouseEvent e)
                    imgPanel_mouseEntered(e);
          imgPanel.addMouseMotionListener(new MouseMotionAdapter()
               public void mouseDragged(MouseEvent e)
                    imgPanel_mouseDragged(e);
     private void addComponent(Container container,Component c,int x,int y,int width,int height)
          c.setBounds(x,y,width,height);
          container.add(c);
     private void imgPanel_mousePressed(MouseEvent e)
          for(int a = 1; a < cottageIcon.length; a++)
               if(withinBounds(e.getX(),e.getY(),cottageIcon[a].getBounds()))
                    System.out.println("B" + withinBounds(e.getX(),e.getY(),cottageIcon[a].getBounds()));
                    selectedCottage = a;
                    keepMoving = true;
     private void imgPanel_mouseReleased(MouseEvent e)
          System.out.println("called");
          selectedCottage = 0;
          keepMoving = false;
     private void imgPanel_mouseDragged(MouseEvent e)
           System.out.println("XXX" + Math.random() * 100);
          if(keepMoving)
               int x = e.getX();
                int y = e.getY();
                if(selectedCottage!= 0)
                     cottageIcon[selectedCottage].setBounds(x-(30/2),y-(30/2),30,30);
                if(!legalBounds(imgPanel,cottageIcon[selectedCottage]))
                    keepMoving = false;
                    cottageIcon[selectedCottage].setBounds(imgPanel.getWidth()/2,imgPanel.getHeight()/2,30,30);
          System.out.println(cottageIcon[selectedCottage].getBounds());
     private void imgPanel_mouseEntered(MouseEvent e)
           System.out.println("entered");
     private void but1_actionPerformed(ActionEvent e)
          String input = JOptionPane.showInputDialog(null,"Enter selected cottage");
          selectedCottage = Integer.parseInt(input) - 1;
     public boolean legalBounds(Component containerComponent, Component subComponent)
          int contWidth = containerComponent.getWidth();
          int contHeight = containerComponent.getHeight();
          int subComponentX = subComponent.getX();
          int subComponentY = subComponent.getY();
          int subComponentWidth = subComponent.getWidth();
          int subComponentHeight = subComponent.getHeight();
          if((subComponentX < 0) || (subComponentY < 0) || (subComponentX > contWidth) || (subComponentY > contHeight))
               return false;
          return true;
     public boolean withinBounds(int mouseX, int mouseY, Rectangle componentRectangle)
          int componentX = (int)componentRectangle.getX();
          int componentY = (int)componentRectangle.getY();
          int componentHeight = (int)componentRectangle.getHeight();
          int componentWidth = (int)componentRectangle.getWidth();
          if((mouseX >= componentX) && (mouseX <= (componentX + componentWidth)) && (mouseY >= componentY) && (mouseY <= (componentY + componentWidth)))
               return true;
          return false;
     public static void main(String[] args)
          JFrame.setDefaultLookAndFeelDecorated(true);
          //JDialog.setDefaultLookAndFeelDecorated(true);
          try
               UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
          catch (Exception ex)
               System.out.println("Failed loading L&F: ");
               System.out.println(ex);
          FinalTest ft = new FinalTest();
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class JImagePanel extends JPanel
private Image image;
public JImagePanel(String imgFileName)
     image = new ImageIcon(imgFileName).getImage();
    setLayout(null);
public void paintComponent(Graphics g)
    g.drawImage(image, 0, 0, null);
public Dimension getImageSize()
            Dimension size = new Dimension(image.getWidth(null), image.getHeight(null));
         return size;
public int getImageWidth()
          int width = image.getWidth(null);
          return width;
public int getImageHeight()
          int height = image.getHeight(null);
          return height;
}Now the problem I'm having is changing that class to a JFrame, it seems simple but I keep having problems like when it runs from another JFrame nothing pops up. I can do it like this:
FinalTest ft = new FinalTest();
ft.setVisible(false);
JPanel example = ft.contentPanehowever I will probably be marked down on this for bad code. I'm not asking for the work to be done for me, but I'm really stuck on this and just need some pointers so I can carry on with the project. Thanks,
Steve

CeciNEstPasUnProgrammeur wrote:
I'd actually consider your GUI being a JPanel instead of a JFrame quite good design - makes it easy to put the stuff into an applet when necessary...
Anyway, you should set setVisible() to true to make it appear, not to false. Otherwise, I don't seem to understand your problem.That is actually my problem. I am trying to convert this JFrame to a JPanel

Problem with JTable and JPanel

Hi,
I'm having problems with a JTable in a JPanel. The code is basicly as follows:
public class mainFrame extends JFrame
        public mainFrame()
                //A menu is implemeted giving rise to the following actions:
                public void actionPerformed(ActionEvent evt)
                        String arg = evt.getActionCommand();
                        if(arg.equals("Sit1"))
                        //cells, columnNames are initiated correctly
                        JTable table = new JTable(cells,columnNames);
                        JPanel holdingPanel = new JPanel();
                        holdingPanel.setLayout( new BorderLayout() );
                        JScrollPane scrollPane = new JScrollPane(holdingPanel);
                        holdingPanel.setBackground(Color.white);
                        holdingPanel.add(table,BorderLayout.CENTER);
                        add(scrollPane, "Center");
                        if(arg.equals("Sit2"))
                                if(scrollPane !=null)
                                        remove(scrollPane);validate();System.out.println("ScrollPane");
                                if(holdingPanel !=null)
                                        remove(holdingPanel);
                                if(table !=null)
                                        remove(table);table.setVisible(false);System.out.println("table");
                        //Put other things on the holdingPanel....
        private JScrollPane scrollPane;
        private JPanel holdingPanel;
        private JTable table;
}The problem is that the table isn't removed. When you choose another situation ( say Sit2), at first the table apparently is gone, but when you press with the mouse in the area it appeared earlier, it appears again. How do I succesfully remove the table from the panel? Removing the panel doesn't seem to be enough. Help is much appreciated...
Best regards
Schwartz

If you reuse the panel and scroll pane throughout the application,
instantiate them in the constructor, not in an often-called event
handler. In the event handler, you only do add/remove of the table
on to the panel. You can't remove the table from the container
which does not directly contain it.
if (arg.equals("Sit2")){
holdingPanel.remove(table);
holdingPanel.revalidate();
holdingPanel.repaint(); //sometimes necessary
}

Problem with jframe has jtextfield and jpanel

hi all
i ve a jframe with some components on it
of these components a jpanel that i repaint each time i want
and a textfield for chatting between players
the problem is as follows
some times when i click the textfield after repaining the panel
it can not be activated and the caret does not appear
when i click any other component out or in the frame
and return i get it active and in a good state
i use single buffer for repapint
thanks for reading
i'm waiting for response

Your best bet here is to show us your code. We don't want to see all of it, but rather you should condense your code into the smallest bit that still compiles, has no extra code that's not relevant to your problem, but still demonstrates your problem, in other words, an SSCCE (Short, Self Contained, Correct (Compilable), Example). For more info on SSCCEs please look here:
[http://homepage1.nifty.com/algafield/sscce.html|http://homepage1.nifty.com/algafield/sscce.html]
Again, if the code is compilable and runnable more people will be able to help you.
Also, when posting your code, please use code tags so that your code will retain its formatting and be readable. To do this, you will need to paste already formatted code into the forum, highlight this code, and then press the "code" button at the top of the forum Message editor prior to posting the message. You may want to click on the Preview tab to make sure that your code is formatted correctly. Another way is to place the tag [code] at the top of your block of code and the tag [/code] at the bottom, like so:
[code]
// your code block goes here.
// note the differences between the tag at the top vs the bottom.
[/code]

JMenuItem and JPanel issues!

I have a JMenuBar set up for my program and I want each JMenuItem to show a seperate JPanel when clicked. I've tried container.add(panel1); and panel1.setVisible(true); // (Previously set to false) but neither work.
This is how I've implemented it:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class LibraryGUI extends JFrame {
     private Container container;
     private JPanel addStaffPanel, addStudentPanel;
     private JLabel addStaffTitle, addStudentTitle;
     // Set up GUI
     public LibraryGUI() {
          super("Visual Library 2.0");
          container = getContentPane();
          // Main menu items
          JMenu fileMenu = new JMenu("File");
          JMenu addMenu = new JMenu("Add");
          JMenu removeMenu = new JMenu("Remove");
          JMenu displayMenu = new JMenu("Display");
          // Set up 'File' menu items
          JMenuItem exit = new JMenuItem("Exit");
          // Set up 'Add' menu items
          JMenuItem addStaff = new JMenuItem("Add Staff Member");
          JMenuItem addStudent = new JMenuItem("Add Student Member");
          // Set up the 'File' menu
          fileMenu.add(exit);
          // Set up the 'Add' menu
          addMenu.add(addStaff);
          addMenu.add(addStudent);
          // Create menu bar and attach it to the window
          JMenuBar bar = new JMenuBar();
          setJMenuBar(bar);
          // Add menu's to the menu bar
          bar.add(fileMenu);
          bar.add(addMenu);
          // File --> Exit (THIS WORKS FINE!)
          exit.addActionListener(new ActionListener() {
               public void actionPerformed(ActionEvent e) {
                    System.exit(0);
          // Set up 'Add Staff Member' title
          addStaffTitle = new JLabel();
          addStaffTitle.setText("Add Staff Member");
          // Set up 'Add Student Member' title
          addStudentTitle = new JLabel();
          addStudentTitle.setText("Add Student Member");
          // Set up 'Add Staff Member' panel
          addStaffPanel = new JPanel();
          addStaffPanel.setLayout(new GridLayout(1,1));
          addStaffPanel.add(addStaffTitle);
          // Add --> Add Staff Member (THIS DOESN'T WORK)
          addStaff.addActionListener(new ActionListener() {
               public void actionPerformed(ActionEvent e) {
                    container.add(addStaffPanel);
          // Set up 'Add Student Member' panel
          addStudentPanel = new JPanel();
          addStudentPanel.setLayout(new GridLayout(1,1));
          addStudentPanel.add(addStudentTitle);
          // Window settings
          container.setBackground(Color.WHITE);
          setSize(600, 400);
          setVisible(true);
     public static void main(String args[]) {
          LibraryGUI application = new LibraryGUI();
          application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}It compiles fine, no errors. But when the menu items are clicked it just does nothing. Any ideas?
- Will

Hmm, normally after adding/remove component to/from a panel you would need to use panel.revalidate. However, this didn't seem to work. Playing around I came up with the following:
container.setVisible(false);
container.removeAll();
container.add(addStudentPanel);
container.setVisible(true);
However, instead of using this approach I suggest you look at using a CardLayout. This Layout Manager was designed for this situation, to replace the entire contents of a panel with multiple different panels. Read this section from the Swing tutorial on Using Layout Managers:
http://java.sun.com/docs/books/tutorial/uiswing/layout/visual.html
An added bonus when using the CardLayout is that you can share the same ActionListeners for all panels. When adding a panel to the CardLayout you need to give a name to the panel (eg. "staff", "student"). When you create your menu items you can use the setActionCommand(...) method:
addStaff.setActionCommand("staff");
addStudend.setActionCommand("student");
Now in your action listener you would just use the event.getActionCommand() method to determine which card panel to display.

Jsplitpane and jpanel

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