JFrame or JPanel

Hi,
I am new to Java.
I am reading the Java materials. Sometimes they use JFrame and
sometimes they use JPanel.
Can anyone tell me in which situation they will be used ?
Many thanks in advance.
Ivan

There's also the issue of LayoutManagers.
Each Container has a default LayoutManager which is used to arrange the components within the Container.
This behavior can be changed with the setLayout() method.
Often times, a single JFrame will "contain" several JPanels - each with a specific layout for its Components -
and then the panels are arranged according to the frame's LayoutManager.

Similar Messages

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

Play a flash file inside a container or component like jframe or jpanel

sir ,
i want to embed a flash file inside a jframe or jpanel,
is it possible ,please give me related reference of URL providing
plugin for this.
i will be very thankful for this great help.
it is very importent for me.
bye

I think JMF will support flash files.

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]

Can we add JFrame to JPanel?

hi
I m trying to add JFrame which has JPanel with BufferedImage to another JPanel.
Is it possible? if yes kindly tell me how to achieve this.
thanx

Just another cross poster.
[http://www.java-forums.org/java-2d/16085-how-add-jframe-inside-jpanel.html]
db

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

Disposing JFrame from JPanel

Right, I suspect this has an easy solution, or maybe I have already happened on it, but I thought I'd best ask just in case.
I have an application that creates a JFrame from another JFrame, with a JPanel internal to it. What I want to happen is for the JPanel to do its business in its paintComponent method, and then dispose of its parent JFrame (that's dispose - no System.exit(0)'s here please :) ).
The only way I can see to do it is to pass a reference to the JFrame when the JPanel is created. But this seems to be a bit messy encapsulation-wise.
Any comers?

you could make the parent JFrame have a thread that checked the status of the child JFrame's JPanel every second or so and then close itself when the JPanel is finished doing whatever it is doing.

JFram or Jpanel maximum size

How should I set maximum and minimum size of JFrame (or JPanel using BorderLayout) ? Please note setPreferredSize() and setMaximumSize() are not effective.
Thanks

You can't set the min/max size of a JPanel in a BorderLayout.
You can't directly set the min/max size of a JFrame, but you can add a ComponentListener the the JFrame and resize the JFrame when it exceeds you specified sizes.
Search the forum using "+maximum +addcomponentlistener".
Of course since this is a Swing question, you should be searching the Swing forum.

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.

Best recommendataion to work with one JFrame & Multiple Jpanels(or Windows)

Hi all,
I am a bit new(bie) to Java and Gui but not new to programming.
I need to write an application in using Java. The Current editor I use is Netbeans.
I have a rough idea on how to write this apps, but I would like to confirm if my idea is applicable to such application (from a performance and feasibility standpoint).
The main idea for this application is to have multiple forms that users would populate, and the values entered will be stored in a Database.
I had plan to use only one main Window (JFrame), and no MDI, no multiple Java windows.
My plan was:
-     Create the main form (JFrame) with menus, once the application is loaded, I will check if a database connection is available otherwise open a Jpanel to input database settings (which can be started from the menu).
-     All menus and application/company settings would be set in the main form
-     All features available in the Jpanel would be in a separate class for clarity/lisibility of my code. For instance : user settings would be a separate jpanel class; database settings is a new jpanel class
-     Each Jpanel class would be stored in a separate java/class file.
Here is my test example for now (file MainForm.java) :
import javax.swing.*;
public class MainForm extends JFrame {
    /* Initializing a few variables */
    String databaseServer = null;
    String databaseUserName = null;
    String databasePassword = null;
    /** Creates new form MainForm */
    public MainForm() {
        /* Initializing menus */
        initComponents();
       /* starting a new instance of database configuration */
        DbPanel test = new DbPanel();
    /* Initialization menu and graphical components */
    private void initComponents () {
        JMenuBar BarMenu;
        JMenu MenuConfiguration;
/* �.*/
     BarMenu.add(MenuConfiguration);
     setJMenuBar(BarMenu);
     pack();
     * @param args the command line arguments
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MainForm().setVisible(true);
} Here is my DBpanel class (file MainForm.java) :
public class DbPanel extends javax.swing.JPanel {
    /** Creates new form DbPanel */
    public DbPanel() {
        initComponents();
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
    private void initComponents() {
        java.awt.Button buttonClose;
        java.awt.Button buttonSave;
        java.awt.TextField dbName;
/* � */
       gridBagConstraints.ipadx = 100;
        gridBagConstraints.insets = new java.awt.Insets(0, 21, 0, 21);
        add(dbPassword, gridBagConstraints);
// </editor-fold>
}Here are then my questions:
-     Would you think that is a practical plan to write such application?
-     Once I display a Jpanel form and I close it (for instance myJpanel.setVisible=false), will the memory be freed?
-     Is there any other way to remove entire a JPanel from RAM?
-     How can I call my �external� Jpanel ? I have designed one Jpanel class for testing but I was not able to display it when I created the new instance of that class.
-     Is there any other alternative to Jpanel for this application? I was thinking about opening a new window within my Jframe. But, ideally it would be best that multiple windows are not opened simultaneously.
Thanks for your input

I was thinking about this but requirements are the
application development cost should be reduced to the
minimum.
thus one desktop application and one database
server.Application development cost? If you are being paid to do this, the bulk of the cost will be your hourly rate times the number of hours it takes you to do it. Thus you want to minimize the number of hours it takes you to do it. Assuming that the cost of your learning Java is going to be charged to this project, it might well be a good idea for you to do it in a language you already know. Or one where it's easy to develop this sort of application.

Custom JPanel moves inside JFrame when Jpanel.paintComponent(...) is called

I have a custom JPanel (CompassCalculatorPanel) that is created, setup and placed within a custom JFrame (CompassCalcFrame). Calling the JFrame constructor sets this all up and makes the Frame show up. All is good with placement and drawing initially. Then when a user changes the spinner value (change the compass heading) it is supposed to redraw the arrow within the panel. It does this just fine, but on the repaint, and subsequent paints, the Panel ends up being placed in the upper left corner of the frame, rather than at the place I positioned it. I've tried saving the upper left corner placement coordinates and calling setBounds(...) before and after the paintComponent(...) method is called. This has no effect, the panel still resides at 0, 0.
boldAny help that keeps the panel in place would be appreciated!*bold*
I am opening a new CompassCalcFrame with the following code from another GUI application like this (but this works from an example program perspective):
import com.vikingvirtual.flightsim.CompassCalcFrame;
* @author madViking
public class Main
    public static void main(String[] args)
        CompassCalcFrame CCF = new CompassCalcFrame();
}The CompassCalcFrame.java code:
package com.vikingvirtual.flightsim;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Insets;
import java.awt.Point;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JSeparator;
import javax.swing.JSpinner;
import javax.swing.JTextField;
* @author madViking
public class CompassCalcFrame extends JFrame
    private CompassCalculatorPanel ccPanel;
    private JButton closeButton;
    private JLabel frameTitle;
    private JSeparator frameSeparator1;
    private JSpinner hdgSpinner;
    private JTextField neField;
    private JTextField eField;
    private JTextField seField;
    private JTextField sField;
    private JTextField swField;
    private JTextField wField;
    private JTextField nwField;
    private Point ccPanelPoint;
    public CompassCalcFrame()
        super ("Compass Heading Calculator");
        initComponents();
        this.setVisible(true);
        calculateAndDraw();
    private void initComponents()
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        this.setLayout(null);
        this.setBackground(Color.BLACK);
        this.setForeground(Color.BLACK);
        Container ccPane = this.getContentPane();
        Dimension panelDim = ccPane.getSize();
        Font buttonFont = new Font("Tahoma", 0, 12);
        Font compassFont = new Font("Digital-7", 0, 24);
        Font titleFont = new Font("Lucida Sans", 1, 14);
        frameTitle = new JLabel();
        frameTitle.setText("Compass Heading Calculator");
        frameTitle.setFont(titleFont);
        frameTitle.setForeground(Color.WHITE);
        closeButton = new JButton();
        closeButton.setText("Close");
        closeButton.setToolTipText("Click to close view");
        closeButton.setFont(buttonFont);
        closeButton.addActionListener(new java.awt.event.ActionListener() {public void actionPerformed(java.awt.event.ActionEvent evt)
                                                                          {closeButtonActionPerformed(evt);}});
        hdgSpinner = new JSpinner();
        hdgSpinner.setFont(compassFont);
        hdgSpinner.setModel(new javax.swing.SpinnerNumberModel(0, 0, 359, 1));
        hdgSpinner.setToolTipText("Enter heading to see angles change");
        hdgSpinner.addChangeListener(new javax.swing.event.ChangeListener() {public void stateChanged(javax.swing.event.ChangeEvent evt)
                                                                            {hdgSpinnerStateChanged(evt);}});
        neField = new JTextField();
        neField.setBackground(Color.BLACK);
        neField.setEditable(false);
        neField.setFont(compassFont);
        neField.setForeground(Color.WHITE);
        neField.setHorizontalAlignment(JTextField.CENTER);
        neField.setBorder(null);
        eField = new JTextField();
        eField.setBackground(Color.BLACK);
        eField.setEditable(false);
        eField.setFont(compassFont);
        eField.setForeground(Color.WHITE);
        eField.setHorizontalAlignment(JTextField.CENTER);
        eField.setBorder(null);
        seField = new JTextField();
        seField.setBackground(Color.BLACK);
        seField.setEditable(false);
        seField.setFont(compassFont);
        seField.setForeground(Color.WHITE);
        seField.setHorizontalAlignment(JTextField.CENTER);
        seField.setBorder(null);
        sField = new JTextField();
        sField.setBackground(Color.BLACK);
        sField.setEditable(false);
        sField.setFont(compassFont);
        sField.setForeground(Color.WHITE);
        sField.setHorizontalAlignment(JTextField.CENTER);
        sField.setBorder(null);
        swField = new JTextField();
        swField.setBackground(Color.BLACK);
        swField.setEditable(false);
        swField.setFont(compassFont);
        swField.setForeground(Color.WHITE);
        swField.setHorizontalAlignment(JTextField.CENTER);
        swField.setBorder(null);
        wField = new JTextField();
        wField.setBackground(Color.BLACK);
        wField.setEditable(false);
        wField.setFont(compassFont);
        wField.setForeground(Color.WHITE);
        wField.setHorizontalAlignment(JTextField.CENTER);
        wField.setBorder(null);
        nwField = new JTextField();
        nwField.setBackground(Color.BLACK);
        nwField.setEditable(false);
        nwField.setFont(compassFont);
        nwField.setForeground(Color.WHITE);
        nwField.setHorizontalAlignment(JTextField.CENTER);
        nwField.setBorder(null);
        frameSeparator1 = new JSeparator();
        frameSeparator1.setForeground(Color.WHITE);
        frameSeparator1.setBackground(Color.BLACK);
        ccPanel = new CompassCalculatorPanel();
        // Add components to pane
        ccPane.add(frameTitle);
        ccPane.add(closeButton);
        ccPane.add(frameSeparator1);
        ccPane.add(nwField);
        ccPane.add(hdgSpinner);
        ccPane.add(neField);
        ccPane.add(wField);
        ccPane.add(ccPanel);
        ccPane.add(eField);
        ccPane.add(swField);
        ccPane.add(sField);
        ccPane.add(seField);
        // Begin Component Layout
        Insets paneInsets = ccPane.getInsets();
        Point P1 = new Point(0, 0);
        Point P2 = new Point(0, 0);
        Point P3 = new Point(0, 0);
        Dimension size = frameTitle.getPreferredSize();
        frameTitle.setBounds((5 + paneInsets.left), (5 + paneInsets.top), size.width, size.height);
        P1.setLocation((5 + paneInsets.left), (5 + paneInsets.top + size.height + 5));
        P2.setLocation((P1.x + size.width + 5), (paneInsets.top + 5));
        size = closeButton.getPreferredSize();
        closeButton.setBounds(P2.x, P2.y, size.width, size.height);
        frameSeparator1.setBounds(P1.x, P1.y, (panelDim.width - paneInsets.left - paneInsets.right), 10);
        P1.setLocation(P1.x, (P1.y + 10 + 5));
        P2.setLocation((P1.x + 50 + 75), P1.y);
        P3.setLocation((P1.x + 50 + 75 + 60 + 75), P1.y);
        nwField.setBounds(P1.x, P1.y, 50, 26);
        hdgSpinner.setBounds(P2.x, P2.y, 60, 26);
        neField.setBounds(P3.x, P3.y, 50, 26);
        P2.setLocation((P1.x + 50 + 5), (P1.y + 26 + 5));
        P1.setLocation(P1.x, (P1.y + 26 + 5 + 87));
        P3.setLocation((P1.x + 50 + 5 + 200 + 5), P1.y);
        wField.setBounds(P1.x, P1.y, 50, 26);
        ccPanel.setBounds(P2.x, P2.y, 200, 200);
        ccPanelPoint = new Point(P2.x, P2.y);
        eField.setBounds(P3.x, P3.y, 50, 26);
        P1.setLocation(P1.x, (P1.y + 26 + 87 + 5));
        P2.setLocation((P1.x + 50 + 80), P1.y);
        P3.setLocation((P1.x + 50 + 80 + 50 + 80), P1.y);
        swField.setBounds(P1.x, P1.y, 50, 26);
        sField.setBounds(P2.x, P2.y, 50, 26);
        seField.setBounds(P3.x, P3.y, 50, 26);
        // End with Frame sizing
        Dimension frameDim = new Dimension((paneInsets.left + 5 + 50 + 5 + 200 + 5 + 50 + 5 + paneInsets.right + 10), (P1.y + 26 + 5 + paneInsets.bottom + 40));
        this.setPreferredSize(frameDim);
        this.setSize(frameDim);
        //this.setSize((paneInsets.left + 5 + 50 + 5 + 200 + 5 + 50 + 5 + paneInsets.right), (P1.y + 26 + 5 + paneInsets.bottom));
    private void closeButtonActionPerformed(java.awt.event.ActionEvent evt)
        this.dispose();
    private void hdgSpinnerStateChanged(javax.swing.event.ChangeEvent evt)
        calculateAndDraw();
    private void calculateAndDraw()
        int angle = (Integer)hdgSpinner.getValue();
        int[] headings = new int[7];
        int addAngle = 45;
        for (int i = 0; i < 7; i++)
            headings[i] = angle + addAngle;
            if (headings[i] >= 360)
                headings[i] -= 360;
            addAngle += 45;
        neField.setText(String.valueOf(headings[0]));
        eField.setText(String.valueOf(headings[1]));
        seField.setText(String.valueOf(headings[2]));
        sField.setText(String.valueOf(headings[3]));
        swField.setText(String.valueOf(headings[4]));
        wField.setText(String.valueOf(headings[5]));
        nwField.setText(String.valueOf(headings[6]));
        ccPanel.paintComponent(this.getGraphics(), angle);
        ccPanel.setBounds(ccPanelPoint.x, ccPanelPoint.y, 200, 200);
        //ccPanel.repaint(this.getGraphics(), angle);
}The CompassCalculatorPanel.java code:
* To change this template, choose Tools | Templates
* and open the template in the editor.
package com.vikingvirtual.flightsim;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Stroke;
* @author madViking
public class CompassCalculatorPanel extends javax.swing.JPanel
    private int xCent;
    private int yCent;
    public CompassCalculatorPanel()
        super();
    @Override
    public void paintComponent(Graphics g)
        paintComponent(g, 0);
    public void repaint(Graphics g, int angle)
        paintComponent(g, angle);
    public void paintComponent(Graphics g, int angle)
        super.paintComponent(g);
        Dimension panelDim = this.getSize();
        xCent = (panelDim.width / 2);
        yCent = (panelDim.height / 2);
        float[] dashArray = {8.0f};
        Graphics2D g2D = (Graphics2D)g;
        g2D.setColor(new Color(53, 153, 0));
        g2D.fillRect(0, 0, panelDim.width, panelDim.height);
        BasicStroke hdgLine = new BasicStroke(3.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER);
        BasicStroke northLine = new BasicStroke(1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 10.0f, dashArray, 0.0f);
        Stroke stdStroke = g2D.getStroke();
        // Setup Heading Arrow Points
        Point hdgBottom = new Point(xCent, panelDim.height - 15);
        Point hdgTop = new Point(xCent, 15);
        Point ltHdgArr = new Point(xCent - 10, 20);
        Point rtHdgArr = new Point(xCent + 10, 20);
        // Setup North Arrow Points
        Point nthBottom = new Point(xCent, panelDim.height - 15);
        Point nthTop = new Point(xCent, 15);
        Point ltNthArr = new Point(xCent - 8, 20);
        Point rtNthArr = new Point(xCent + 8, 20);
        // Rotate North Arrow Points
        nthBottom = rotatePoint(nthBottom, (0 - angle), true);
        nthTop = rotatePoint(nthTop, (0 - angle), true);
        ltNthArr = rotatePoint(ltNthArr, (0 - angle), true);
        rtNthArr = rotatePoint(rtNthArr, (0 - angle), true);
        // Draw Heading Line
        g2D.setColor(Color.RED);
        g2D.setStroke(hdgLine);
        g2D.drawLine(hdgBottom.x, hdgBottom.y, hdgTop.x, hdgTop.y);
        g2D.drawLine(ltHdgArr.x, ltHdgArr.y, hdgTop.x, hdgTop.y);
        g2D.drawLine(rtHdgArr.x, rtHdgArr.y, hdgTop.x, hdgTop.y);
        g2D.setStroke(stdStroke);
        // Draw North Line
        g2D.setColor(Color.WHITE);
        g2D.setStroke(northLine);
        g2D.drawLine(nthBottom.x, nthBottom.y, nthTop.x, nthTop.y);
        g2D.drawLine(ltNthArr.x, ltNthArr.y, nthTop.x, nthTop.y);
        g2D.drawLine(rtNthArr.x, rtNthArr.y, nthTop.x, nthTop.y);
        g2D.setStroke(stdStroke);
        // Draw circles
        g2D.setColor(Color.BLUE);
        g2D.setStroke(hdgLine);
        g2D.drawOval(5, 5, (panelDim.width - 10), (panelDim.height - 10));
        g2D.setStroke(stdStroke);
        g2D.fillOval((xCent - 2), (yCent - 2), 5, 5);
        g2D.setStroke(stdStroke);
    private Point rotatePoint(Point p, int angle, boolean centerRelative)
        double ix, iy;
        double hyp = 0.0;
        double degrees = 0.0;
        if (centerRelative == true)
            ix = (double)(p.x - xCent);
            iy = (double)((p.y - yCent)*-1);
        else
            ix = (double)p.x;
            iy = (double)p.y;
        if (ix == 0)
            ix = 1;
        hyp = Math.sqrt((Math.pow(ix, 2)) + (Math.pow(iy, 2)));
        if ((ix >= 0) && (iy >= 0))
            degrees = Math.toDegrees(Math.atan(ix/iy));
        else if((ix >= 0) && (iy < 0))
            degrees = Math.abs(Math.toDegrees(Math.atan(iy/ix)));
            degrees = degrees + 90.0;
        else if ((ix < 0) && (iy < 0))
            degrees = Math.toDegrees(Math.atan(ix/iy));
            degrees = degrees + 180.0;
        else if ((ix < 0) && (iy >= 0))
            degrees = Math.abs(Math.toDegrees(Math.atan(iy/ix)));
            degrees = degrees + 270.0;
        degrees = degrees + angle;
        if (degrees >= 360)
            degrees = degrees - 360;
        if (degrees < 0)
            degrees = degrees + 360;
        double interX = Math.sin(Math.toRadians(degrees));
        double interY = Math.cos(Math.toRadians(degrees));
        interX = interX * hyp;
        interY = ((interY * hyp) * -1);
        if (centerRelative == true)
            p.x = xCent + (int)Math.floor(interX);
            p.y = yCent + (int)Math.floor(interY);
        else
            p.x = (int)Math.floor(interX);
            p.y = (int)Math.floor(interY);
        return p;
}

In response to the first couple of comments made about using Absolute positioning (layout null), I took a look at the page on doing layouts, which happens to be the link you sent. I read about each, and decided that a GridBag layout would be best. So I created a new class called CompassCalcGridBagFrame and set it all up using the same components, but with a Grid Bag layout. I encounter the exact same problem.
Just FYI: I originally created this frame using the NetBeans (6.9.1) Frame form builder. By default that uses the Free Design setting, which creates group layouts for both vertical and horizontal spacing. This is where the problem first came to be. I next used the builder to create an absolute positioning frame, which had the same issue. That is when I started building my frames using code only - no NetBeans GUIs. This is where the absolute layout from scratch code started. Same effect. And now, I've created a Grid Bag layout from code, and same effect. There has to be something I'm missing overall, as this effects all of my different layout designs.
The one thing from gimbal2's previous comment is, should I be using this custom panel within another panel? I am currently adding all of the components (and in Grid Bag, the GridBag layout) to the frame pane itself. Is that OK, or should I use a generic JPanel, and have the components all within that?
Here is the code for the newest frame class (CompassCalcGridBagFrame):
package com.vikingvirtual.flightsim;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.Point;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JSeparator;
import javax.swing.JSpinner;
import javax.swing.JTextField;
* @author madViking
public class CompassCalcGridBagFrame extends JFrame
    private CompassCalculatorPanel ccPanel;
    private JButton closeButton;
    private JLabel frameTitle;
    private JSeparator frameSeparator1;
    private JSpinner hdgSpinner;
    private JTextField neField;
    private JTextField eField;
    private JTextField seField;
    private JTextField sField;
    private JTextField swField;
    private JTextField wField;
    private JTextField nwField;
    private Point ccPanelPoint;
    public CompassCalcGridBagFrame()
        super ("Compass Heading Calculator");
        initComponents();
        this.pack();
        this.setVisible(true);
        calculateAndDraw();
    private void initComponents()
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        Container ccPane = this.getContentPane();
        ccPane.setLayout(new GridBagLayout());
        ccPane.setBackground(Color.BLACK);
        ccPane.setForeground(Color.BLACK);
        Font buttonFont = new Font("Tahoma", 1, 12);
        Font compassFont = new Font("Digital-7", 0, 24);
        Font titleFont = new Font("Lucida Sans", 1, 14);
        frameTitle = new JLabel();
        frameTitle.setText("Compass Heading Calculator");
        frameTitle.setFont(titleFont);
        frameTitle.setHorizontalAlignment(JLabel.CENTER);
        frameTitle.setPreferredSize(new Dimension(220, 25));
        frameTitle.setForeground(Color.BLACK);
        closeButton = new JButton();
        closeButton.setText("Close");
        closeButton.setToolTipText("Click to close view");
        closeButton.setFont(buttonFont);
        closeButton.setPreferredSize(new Dimension(75, 25));
        closeButton.addActionListener(new java.awt.event.ActionListener() {public void actionPerformed(java.awt.event.ActionEvent evt)
                                                                          {closeButtonActionPerformed(evt);}});
        hdgSpinner = new JSpinner();
        hdgSpinner.setFont(compassFont);
        hdgSpinner.setModel(new javax.swing.SpinnerNumberModel(0, -1, 360, 1));
        hdgSpinner.setToolTipText("Enter heading to see angles change");
        hdgSpinner.setPreferredSize(new Dimension(50, 26));
        hdgSpinner.addChangeListener(new javax.swing.event.ChangeListener() {public void stateChanged(javax.swing.event.ChangeEvent evt)
                                                                            {hdgSpinnerStateChanged(evt);}});
        neField = new JTextField();
        neField.setBackground(Color.BLACK);
        neField.setEditable(false);
        neField.setFont(compassFont);
        neField.setForeground(Color.WHITE);
        neField.setHorizontalAlignment(JTextField.CENTER);
        neField.setPreferredSize(new Dimension(50, 26));
        neField.setBorder(null);
        eField = new JTextField();
        eField.setBackground(Color.BLACK);
        eField.setEditable(false);
        eField.setFont(compassFont);
        eField.setForeground(Color.WHITE);
        eField.setHorizontalAlignment(JTextField.CENTER);
        eField.setPreferredSize(new Dimension(50, 26));
        eField.setBorder(null);
        seField = new JTextField();
        seField.setBackground(Color.BLACK);
        seField.setEditable(false);
        seField.setFont(compassFont);
        seField.setForeground(Color.WHITE);
        seField.setHorizontalAlignment(JTextField.CENTER);
        seField.setPreferredSize(new Dimension(50, 26));
        seField.setBorder(null);
        sField = new JTextField();
        sField.setBackground(Color.BLACK);
        sField.setEditable(false);
        sField.setFont(compassFont);
        sField.setForeground(Color.WHITE);
        sField.setHorizontalAlignment(JTextField.CENTER);
        sField.setPreferredSize(new Dimension(50, 26));
        sField.setBorder(null);
        swField = new JTextField();
        swField.setBackground(Color.BLACK);
        swField.setEditable(false);
        swField.setFont(compassFont);
        swField.setForeground(Color.WHITE);
        swField.setHorizontalAlignment(JTextField.CENTER);
        swField.setPreferredSize(new Dimension(50, 26));
        swField.setBorder(null);
        wField = new JTextField();
        wField.setBackground(Color.BLACK);
        wField.setEditable(false);
        wField.setFont(compassFont);
        wField.setForeground(Color.WHITE);
        wField.setHorizontalAlignment(JTextField.CENTER);
        wField.setPreferredSize(new Dimension(50, 26));
        wField.setBorder(null);
        nwField = new JTextField();
        nwField.setBackground(Color.BLACK);
        nwField.setEditable(false);
        nwField.setFont(compassFont);
        nwField.setForeground(Color.WHITE);
        nwField.setHorizontalAlignment(JTextField.CENTER);
        nwField.setPreferredSize(new Dimension(50, 26));
        nwField.setBorder(null);
        frameSeparator1 = new JSeparator();
        frameSeparator1.setForeground(Color.WHITE);
        frameSeparator1.setBackground(Color.BLACK);
        frameSeparator1.setPreferredSize(new Dimension(320, 10));
        ccPanel = new CompassCalculatorPanel();
        ccPanel.setPreferredSize(new Dimension(250, 250));
        GridBagConstraints gbc = new GridBagConstraints();
        // Begin Component Layout
        gbc.insets = new Insets(0, 0, 0, 0);
        gbc.fill = GridBagConstraints.NONE;
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
        gbc.weightx = 0.5;
        gbc.weighty = 0.5;
        gbc.anchor = GridBagConstraints.FIRST_LINE_START;
        ccPane.add(nwField, gbc);
        gbc.gridx = 1;
        gbc.gridy = 0;
        gbc.gridwidth = 2;
        gbc.gridheight = 1;
        gbc.weightx = 0.4;
        gbc.weighty = 0.4;
        gbc.anchor = GridBagConstraints.PAGE_START;
        ccPane.add(hdgSpinner, gbc);
        gbc.gridx = 3;
        gbc.gridy = 0;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
        gbc.weightx = 0.5;
        gbc.weighty = 0.5;
        gbc.anchor = GridBagConstraints.FIRST_LINE_END;
        ccPane.add(neField, gbc);
        gbc.gridx = 0;
        gbc.gridy = 1;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
        gbc.weightx = 0.5;
        gbc.weighty = 0.5;
        gbc.anchor = GridBagConstraints.LINE_START;
        ccPane.add(wField, gbc);
        gbc.gridx = 1;
        gbc.gridy = 1;
        gbc.gridwidth = 2;
        gbc.gridheight = 1;
        gbc.weightx = 1.0;
        gbc.weighty = 1.0;
        gbc.anchor = GridBagConstraints.CENTER;
        ccPane.add(ccPanel, gbc);
        gbc.gridx = 3;
        gbc.gridy = 1;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
        gbc.weightx = 0.5;
        gbc.weighty = 0.5;
        gbc.anchor = GridBagConstraints.LINE_END;
        ccPane.add(eField, gbc);
        gbc.gridx = 0;
        gbc.gridy = 2;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
        gbc.weightx = 0.5;
        gbc.weighty = 0.5;
        gbc.anchor = GridBagConstraints.LAST_LINE_START;
        ccPane.add(swField, gbc);
        gbc.gridx = 1;
        gbc.gridy = 2;
        gbc.gridwidth = 2;
        gbc.gridheight = 1;
        gbc.weightx = 0.5;
        gbc.weighty = 0.5;
        gbc.anchor = GridBagConstraints.PAGE_END;
        ccPane.add(sField, gbc);
        gbc.gridx = 3;
        gbc.gridy = 2;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
        gbc.weightx = 0.5;
        gbc.weighty = 0.5;
        gbc.anchor = GridBagConstraints.LAST_LINE_END;
        ccPane.add(seField, gbc);
        gbc.gridx = 0;
        gbc.gridy = 3;
        gbc.gridwidth = 4;
        gbc.gridheight = 1;
        gbc.insets = new Insets(10, 5, 10, 5);
        gbc.weightx = 0.6;
        gbc.weighty = 0.6;
        gbc.anchor = GridBagConstraints.CENTER;
        ccPane.add(frameSeparator1, gbc);
        gbc.gridx = 1;
        gbc.gridy = 4;
        gbc.gridwidth = 2;
        gbc.gridheight = 1;
        gbc.anchor = GridBagConstraints.PAGE_START;
        ccPane.add(closeButton, gbc);
    private void closeButtonActionPerformed(java.awt.event.ActionEvent evt)
        this.dispose();
    private void hdgSpinnerStateChanged(javax.swing.event.ChangeEvent evt)
        calculateAndDraw();
    private void calculateAndDraw()
        int angle = (Integer)hdgSpinner.getValue();
        if (angle == -1)
            angle = 359;
        if (angle == 360)
            angle = 0;
        int[] headings = new int[7];
        int addAngle = 45;
        for (int i = 0; i < 7; i++)
            headings[i] = angle + addAngle;
            if (headings[i] >= 360)
                headings[i] -= 360;
            addAngle += 45;
        hdgSpinner.setValue(Integer.valueOf(angle));
        neField.setText(String.valueOf(headings[0]));
        eField.setText(String.valueOf(headings[1]));
        seField.setText(String.valueOf(headings[2]));
        sField.setText(String.valueOf(headings[3]));
        swField.setText(String.valueOf(headings[4]));
        wField.setText(String.valueOf(headings[5]));
        nwField.setText(String.valueOf(headings[6]));
        ccPanel.paintComponent(this.getGraphics(), angle);
}

Change jFrame to JPanel

I have a gui that uses Jframe how easy would it be to change it to use jPanel instead? would it just be a few tweeks or would i be basically writting my code again?
Also kind of off topic but if any one could give there view i'd be very happy
The class file that uses the GUI is for entering names and DOB's, the same class can also be used for reading it back in again (data gets saved to a file) in your opinion which would look best
if i split the gui in half so the left side was for entering and the right hand side was for reading in or
if i just had it so there was one lot of text fields which could be used to enter data and if you read in the file would show the data from the file?

I have a gui that uses Jframe how easy would it be to change it to use jPanel instead?You already are already using panels most likely.
All GUI's need a top level container (JFrame, JDialog or JWindow). To the top level container you add Swing components (JPanel, JButton, JTextField, JTable etc...).
So your question doesn't make any sense.
Take a look at the Swing tutorial which has a [url http://java.sun.com/docs/books/tutorial/uiswing/components/components.html]Visual Index of Swing Componentsurl. Click on each component and you will find example programs that use the component and you can see how the program is structured and use that approach in your design.

HELP: How to get window (JFrame) from JPanel ???

Hi there,
anyone knows how I can get a ref. to the window (in the form of JFrame) from my JPanel that is in the actual window??
I need that window when I display a modal dialog from the panel, as the dialog constructor takes the window as a param.
I could always pass a window-ref. to the JPanel when I create it, but as I have a lot of panels, I'd rather be able to get it just when I need it from the JPanel!
Thanks a lot for any help on this issue!
Best regards,
AC

Thanks a lot!
I'll use windowForComponent in swingUtils, I think getRootPane() would only return the panel that the component is in!
Regards,
AC

Jframe inside jpanel

hi all,
is it possible (in some way) to have a jframe inside a jpanel??
Thanks for answering

I think what you want is a JInternalFrame..

JFrame (or JPanel?) doesn't repaint correctly

Hi there
I work with Linux 2.4.17 and KDE 2. When I change to another virtual Desktop and then back to the one where my JFrame is, not everything is repainted correctly. After hiding my JFrame (fully or partially) and bring it back to the front, everything is painted correctly.
I already read the sections about painting in Swing several times and did not find any solution to my problem.
Has anyone a workaround for this problem, or could this possibly be a bug in the Swing architecture?
Thanks a lot for any suggestion!
Regula

Sorry for the huge chunk of code.
Mm, yes, I'm far too lazy to read all that.
But you should be overriding paintComponent(), not paint().
http://www.google.co.uk/search?hl=en&q=java+swing+painting&btnG=Google+Search&meta=
I've not bothered to work out from that pile of magic numbers exactly what you're tring to draw but is it not something that JTable would happily do?

JFrame or JPanel

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