Help regarding JTable in Java Swing

hi,
i m confused regarding JTable in Swing. i hav added a JTextField in a cell of a JTable. i hav attached a kay listener with that textfield . But when i m selecting that cell ,where i hav added that textfield with a single click and typeing any key i m not getting that keyevent. But when i m selecting the same with a doulbe click and typing any thing i m getting that event .
can any one tell me why the discrepency taking place. that textfield is
there in that cell .then how it does make any difference with a single and double click.
regards

i hav added a JTextField in a cell of a JTableYou don't add a text field to a cell in a table. You add a text String to the TableModel. When the user double clicks on the cell an 'editor' is invoked and the text is copied to the editor (which by default is a JTextField). So the KeyStrokes go to the editor text field.
When you just single click on a cell the table still has focus, not the editor, to the KeyStroke character is passed directly to the text field without the text field actually getting focus.

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Printing is a bit of a nightmare, actually. Most of the trouble is layout. Basically a Printable is passed a page number and a graphics context and has to work out what components go on that page and where. It can't depend on the pages being requested in sequence.
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Im using Netbeans...
I have a class for the window (a JFrame) including 2 Jtextfields and 2 Jlabels
import .......
public class myclass extends javax.swing.JFrame{
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gvnom=this.gvnom;
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In future Swing related questions should be posted in the Swing forum and camickr will be more likely to answer if you have used code tags to properly format your code.
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Hi, I have just learn java swing and now creating a chess game. I have sucessfully create a board and able to display chess pieces on the board. By using JLayeredPane, I am able to use drag and drop for the piece. However, there is a problem which is that I can drop the chess piece off the board and the piece would disappear. I have try to solve this problem by trying to find the location that the chess piece is on, store it somewhere and check if the chess piece have been drop off bound. However, I could not manage to solve it. Also, I am very confuse with all these layer thing.
Any suggestion would be very helpful. Thanks in advance
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class ChessBoard extends JFrame implements MouseListener, MouseMotionListener
Object currentPosition;
Color currentColor;
Dimension boardSize = new Dimension(600, 600);
JLayeredPane layeredPane;
JPanel board;
JPanel box;
JLabel chessPiece;
int xAdjustment;
int yAdjustment;
public ChessBoard()
// Use a Layered Pane for this this application
layeredPane = new JLayeredPane();
getContentPane().add(layeredPane);
layeredPane.setPreferredSize( boardSize );
     layeredPane.addMouseListener( this );
layeredPane.addMouseMotionListener( this );
// Add a chess board to the Layered Pane
board = new JPanel();
     // set "board" to the lowest layer (default_layer)
layeredPane.add(board, JLayeredPane.DEFAULT_LAYER);
board.setLayout( new GridLayout(8, 8) );
board.setPreferredSize( boardSize );
board.setBounds(0, 0, boardSize.width, boardSize.height);
     addShade();
     addPiece();
public void addShade()
     for (int i = 0; i < 64; i++)
box = new JPanel( new BorderLayout() );
board.add( box, BorderLayout.CENTER );
     if( ((i / 8) % 2) == 0)
               if( (i % 2) ==0)
                    box.setBackground(Color.lightGray);
               } else {
                    box.setBackground( Color.white);
          } else {
               if( (i % 2) ==0)
                    box.setBackground(Color.white);
               } else {
                    box.setBackground(Color.lightGray);
//Method for adding chess pieces to the board
public void addPiece()
// Add a few pieces to the board
     //black pieces
     for (int i = 0; i < 64; i++)
          //adding black pieces
          if (i < 8)
               String fileName = i + ".gif";
               JLabel blackPieces = new JLabel( new ImageIcon( fileName ) );
               JPanel panel = (JPanel)board.getComponent( i );
               panel.add( blackPieces );
          //adding black pones
          if ((i > 7) && (i < 16))
               String fileName = "8.gif";
               JLabel blackPones = new JLabel( new ImageIcon( fileName ) );
               JPanel panel = (JPanel)board.getComponent( i );
               panel.add( blackPones );
          //jump to white position (Component 48)
          if (i == 16) i = 48;
          //adding white pones
          if(( i > 47 ) && (i < 56))
               JLabel whitePones = new JLabel( new ImageIcon("48.gif") );
               JPanel panel = (JPanel)board.getComponent( i );
               panel.add( whitePones );
          //adding white pieces
          if (i > 55)
               String fileName = i + ".gif";
               JLabel whitePieces = new JLabel( new ImageIcon( fileName ) );
               JPanel panel = (JPanel)board.getComponent( i);
               panel.add( whitePieces );
** Add the selected chess piece to the dragging layer so it can be moved
public void mousePressed(MouseEvent e)
chessPiece = null;
Component c = board.findComponentAt(e.getX(), e.getY());
     c.setBackground(Color.red);
if (c instanceof JPanel) return;
Point parentLocation = c.getParent().getLocation();
xAdjustment = parentLocation.x - e.getX();
yAdjustment = parentLocation.y - e.getY();
chessPiece = (JLabel)c;
chessPiece.setLocation(e.getX() + xAdjustment, e.getY() + yAdjustment);
chessPiece.setSize(chessPiece.getWidth(), chessPiece.getHeight());
layeredPane.add(chessPiece, JLayeredPane.DRAG_LAYER);
** Move the chess piece around
public void mouseDragged(MouseEvent me)
if (chessPiece == null) return;
chessPiece.setLocation(me.getX() + xAdjustment, me.getY() + yAdjustment);
** Drop the chess piece back onto the chess board
public void mouseReleased(MouseEvent e)
     Component c = board.findComponentAt(e.getX(), e.getY());
     int x = (int)c.getBounds().getX();
     int y = (int)c.getBounds().getY();
     System.out.println(c.getLocation());
     System.out.println(x + " "+ y);
     c.setBackground(currentColor);
if (chessPiece == null) return;
chessPiece.setVisible(false);
if (c instanceof JLabel)
Container parent = c.getParent();
     //remove the piece that is capture
parent.remove(0);
parent.add( chessPiece );
else
Container parent = (Container)c;
parent.add( chessPiece );
chessPiece.setVisible(true);
public void mouseClicked(MouseEvent e) {}
public void mouseMoved(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
private static void createAndShowGUI()
     //Make sure we have nice window decorations
     JFrame.setDefaultLookAndFeelDecorated(true);
     JFrame frame = new ChessBoard();
     frame.setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE );
     //Display the window
     frame.pack();
     frame.setResizable( false );
     frame.setLocationRelativeTo( null );
     frame.setVisible(true);
public static void main(String[] args)
     //Schedule a job for the event-dispatching thread:
     //creating and showing this application's GUI
     javax.swing.SwingUtilities.invokeLater( new Runnable()
               public void run()
                    createAndShowGUI();
}

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class ChessBoardRx extends JFrame implements MouseListener, MouseMotionListener
    Object currentPosition;
    Color currentColor;
    Dimension boardSize = new Dimension(600, 600);
    JLayeredPane layeredPane;
    JPanel board;
    JPanel box;
    JLabel chessPiece;
    int xAdjustment;
    int yAdjustment;
    Container lastParent;
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        // Use a Layered Pane for this this application
        layeredPane = new JLayeredPane();
        getContentPane().add(layeredPane);
        layeredPane.setPreferredSize( boardSize );
        layeredPane.addMouseListener( this );
        layeredPane.addMouseMotionListener( this );
        // Add a chess board to the Layered Pane
        board = new JPanel();
        // set "board" to the lowest layer (default_layer)
        layeredPane.add(board, JLayeredPane.DEFAULT_LAYER);
        board.setLayout( new GridLayout(8, 8) );
        board.setPreferredSize( boardSize );
        board.setBounds(0, 0, boardSize.width, boardSize.height);
        addShade();
        addPiece();
//        populateBoard();
    public void addShade()
        for (int i = 0; i < 64; i++)
            box = new JPanel( new BorderLayout() );
            board.add( box, BorderLayout.CENTER );
            if( ((i / 8) % 2) == 0)
                if( (i % 2) ==0)
                    box.setBackground(Color.lightGray);
                } else {
                    box.setBackground( Color.white);
            } else {
                if( (i % 2) ==0)
                    box.setBackground(Color.white);
                } else {
                    box.setBackground(Color.lightGray);
    //Method for adding chess pieces to the board
    public void addPiece()
        // Add a few pieces to the board
        //black pieces
        for (int i = 0; i < 64; i++)
            //adding black pieces
            if (i < 8)
                String fileName = i + ".gif";
                JLabel blackPieces = new JLabel( new ImageIcon( fileName ) );
                JPanel panel = (JPanel)board.getComponent( i );
                panel.add( blackPieces );
            //adding black pones
            if ((i > 7) && (i < 16))
                String fileName = "8.gif";
                JLabel blackPones = new JLabel( new ImageIcon( fileName ) );
                JPanel panel = (JPanel)board.getComponent( i );
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            //jump to white position (Component 48)
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            //adding white pones
            if(( i > 47 ) && (i < 56))
                JLabel whitePones = new JLabel( new ImageIcon("48.gif") );
                JPanel panel = (JPanel)board.getComponent( i );
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            //adding white pieces
            if (i > 55)
                String fileName = i + ".gif";
                JLabel whitePieces = new JLabel( new ImageIcon( fileName ) );
                JPanel panel = (JPanel)board.getComponent( i);
                panel.add( whitePieces );
    private void populateBoard() {
        int[][] pos = {
            { 9, 7, 5, 1, 3, 5, 7, 9 },
            { 8, 6, 4, 0, 2, 4, 6, 8 }
        for(int j = 0; j < 8; j++) {
            String fileName = "chessImages/" + pos[0][j] + ".jpg";
            JLabel label = new JLabel( new ImageIcon( fileName ) );
            JPanel panel = (JPanel)board.getComponent( j );
            panel.add( label );
        for(int j = 8; j < 16; j++) {
            String fileName = "chessImages/" + 11 + ".jpg";
            JLabel label = new JLabel( new ImageIcon( fileName ) );
            JPanel panel = (JPanel)board.getComponent( j );
            panel.add( label );
        for(int j = 56, k = 0; j < 64; j++, k++) {
            String fileName = "chessImages/" + pos[1][k] + ".jpg";
            JLabel label = new JLabel( new ImageIcon( fileName ) );
            JPanel panel = (JPanel)board.getComponent( j );
            panel.add( label );
        for(int j = 48; j < 56; j++) {
            String fileName = "chessImages/" + 10 + ".jpg";
            JLabel label = new JLabel( new ImageIcon( fileName ) );
            JPanel panel = (JPanel)board.getComponent( j );
            panel.add( label );
     ** Add the selected chess piece to the dragging layer so it can be moved
    public void mousePressed(MouseEvent e)
        chessPiece = null;
        Component c = board.findComponentAt(e.getX(), e.getY());
        c.setBackground(Color.red);
        if (c instanceof JPanel) return;
        lastParent = c.getParent();
        Point parentLocation = c.getParent().getLocation();
        xAdjustment = parentLocation.x - e.getX();
        yAdjustment = parentLocation.y - e.getY();
        chessPiece = (JLabel)c;
        chessPiece.setLocation(e.getX() + xAdjustment, e.getY() + yAdjustment);
        chessPiece.setSize(chessPiece.getWidth(), chessPiece.getHeight());
        layeredPane.add(chessPiece, JLayeredPane.DRAG_LAYER);
     ** Move the chess piece around
    public void mouseDragged(MouseEvent me)
        if (chessPiece == null) return;
        chessPiece.setLocation(me.getX() + xAdjustment, me.getY() + yAdjustment);
     ** Drop the chess piece back onto the chess board
    public void mouseReleased(MouseEvent e)
        Component c = board.findComponentAt(e.getX(), e.getY());
        if(c == null) {
            layeredPane.remove(chessPiece);
            lastParent.add(chessPiece);
            Rectangle r = lastParent.getBounds();
            chessPiece.setLocation(r.x+xAdjustment, r.y+yAdjustment);
            lastParent.validate();
            lastParent.repaint();
            return;
        int x = (int)c.getBounds().getX();
        int y = (int)c.getBounds().getY();
        System.out.println(c.getLocation());
        System.out.println(x + " "+ y);
        c.setBackground(currentColor);
        if (chessPiece == null) return;
        chessPiece.setVisible(false);
        if (c instanceof JLabel)
            Container parent = c.getParent();
            //remove the piece that is capture
            parent.remove(0);
            parent.add( chessPiece );
        else
            Container parent = (Container)c;
            parent.add( chessPiece );
        chessPiece.setVisible(true);
    public void mouseClicked(MouseEvent e) {}
    public void mouseMoved(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}
    private static void createAndShowGUI()
        //Make sure we have nice window decorations
        JFrame.setDefaultLookAndFeelDecorated(true);
        JFrame frame = new ChessBoardRx();
        frame.setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE );
        //Display the window
        frame.pack();
        frame.setResizable( false );
        frame.setLocationRelativeTo( null );
        frame.setVisible(true);
    public static void main(String[] args)
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI
        javax.swing.SwingUtilities.invokeLater( new Runnable()
            public void run()
                createAndShowGUI();
}

Java Swing Help

Hi, I am currently using a program called JPadPro for my java source codes. I am just beginning to learn java and I have just started on Java Swing GUI codings. My problem is that the program compiles, but it doesn't run. It always give me an error saying
"Cannot find main method, Program will exit". there is nothing wrong with my source code because I can run somewhere else. I think I didn't configure my Jpadpro correctly. (but anything without GUI does work)
Thank You for your help :)

Even though you are running a swing application, you still need a main method just as in non-GUI applications. The main should create an instance of the JFrame at the base of you swing app. A simple example is as follows:
public class mySwingApp extends JFrame {
public mySwingApp(String title) {
super(title);
// GUI components, layouts, possible listeners here
public static void main(String[] args) {
JFrame mainFrame = new mySwingApp("My first swing app");
mainFrame.setSize(200, 200);
mainFrame.setVisible(true);
}Hope this helps some!
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Need Help Regarding JAVA BEAN

Is any one tell me that JAVA BEAN only used in WEB or also you in Desktop applications???? and aslo tell how i implement Java class and use JAVA BEAN. I need help regarding above matter
thanks in advance
Rehan MIrza

Here is a good link that indicate that JavaBean is not only for applets
http://java.sun.com/docs/books/tutorial/javabeans/whatis/beanDefinition.html
quote:
The JavaBeans API makes it possible to write component software in the Java programming language. Components are self-contained, reusable software units that can be visually composed into composite components, applets, applications, and servlets using visual application builder tools. JavaBean components are known as Beans.
Francois

Chess: Java Swing problem!! Help need

Hi, I have just learn java swing and now creating a chess game. I have sucessfully create a board and able to display chess pieces on the board. By using JLayeredPane, I am able to use drag and drop for the piece. However, there is a problem which is that I can drop the chess piece off the board and the piece would disappear. I have try to solve this problem by trying to find the location that the chess piece is on, store it somewhere and check if the chess piece have been drop off bound. However, I could not manage to solve it. Also, I am very confuse with all these layer thing.
Any suggestion would be very helpful. Thanks in advance

I wonder if you are biting off a little more than you can chew. This seems like a big project for a beginning coder. Anyway, my suggestions can only be general since we only have general information:
1) Break the big problem down into little pieces. Get the pieces working, then put them together.
2) Make sure your program logic is separate from your GUI.
3) If still having problems, post an SSCCE. See this link to tell you how:
http://homepage1.nifty.com/algafield/sscce.html
4) And as camikr would say (and flounder just said): next time, post this in the Swing forum.
Good luck!

A tiny font is used in many places across Java Swing applications (help!)

In many places in Java but mostly in text boxes I'm seeing a very small font that is quite hard to read.
I am seeing this all over the place in Java programs and it is getting on my nerves.
I'm not sure what is causing this.
I also encountered this issue when running Java on Windows XP.
I really need help on how to solve this,
Or maybe it is actually a bug with Java itself and Windows?
An image of the problem in SwingSet2:
[SwingSet 2 Tiny Font Example|http://img687.imageshack.us/img687/1373/swingset2tinyfont.png]
System spec:
Windows 7 Professional 32-bit (Aero is on)
Java 6 Update 20
English system locale and language
No special dpi settings (default)
Screen Resolution: 1280x1024
Avast Antivirus 5.0
An intel graphics card
Edited by: Temp111 on May 9, 2010 7:38 AM

camickr wrote:
That is not a problem. Somewhere in that code the programmer uses setFont(....) to make it a smaller font. The default font of a text component does not behave like that.
For more help create a [SSCCE (Short, Self Contained, Compilable and Executable, Example Program)|http://sscce.org/], that demonstrates the incorrect behaviour.
Don't forget to use the Code Formatting Tags so the posted code retains its original formatting. That is done by selecting the code and then clicking on the "Code" button above the question input area.No, it's defiantly a problem. Probably in the default fonts that Swing uses in some places.
I detected one place where I can easily trigger this issue, a JTextArea And the Windows Look and Feel, So here is a SSCCE for you:
[Picture Of Tiny Font SSCCE With Tiny Font issue|http://img88.imageshack.us/img88/7876/tinyfont.png]
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TinyFont {
     public static void main(String[] args) {
          try {
               UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
          } catch (ClassNotFoundException e) {
               e.printStackTrace();
          } catch (InstantiationException e) {
               e.printStackTrace();
          } catch (IllegalAccessException e) {
               e.printStackTrace();
          } catch (UnsupportedLookAndFeelException e) {
               e.printStackTrace();
          JFrame frame = new JFrame("Tiny Font");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          JTextArea textArea = new JTextArea("Tiny Font Test");
          frame.add(textArea);
          frame.setSize(150, 100);
          frame.setLocationRelativeTo(null);
          frame.setVisible(true);
}But I also encountered this issue in other places that use Swing.
Try SwingSet2 Source Code Tab for example: [SwingSet2|http://java.sun.com/products/jfc/jws/SwingSet2.jnlp]

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