JTable with null table headar

Hi -
Is there a way to dynamically set the table header of a JTable to null? I know when you create the instance of the JTable, and do a setTableHeader(null), the table headers do not show up. However, is it possible to after the table is created and displayed to call setTableHeader(null) and have the table headers disappear? btw, the table is in a scroll pane... And I have tried a bunch of different repaint and resize on the table and the scroll pane... They still don't disappear... I am on Swing 1.3.1
Thanks,
Kelly

Hi,
after setting the table header to null, call
scrollPane.getViewport().setView(table);
or
scrollPane.getColumnHeader().removeAll();Better to call table.addNotify(). This way you may not know the scrollpane, just the JTable!
Greetings, ULi

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JButton in JTable with custom table model

Hi!
I want to include a JButton into a field of a JTable. I do not know why Java does not provide a standard renderer for JButton like it does for JCheckBox, JComboBox and JTextField. I found some previous postings on how to implement custom CellRenderer and CellEditor in order to be able to integrate a button into the table. In my case I am also using a custom table model and I was not able to create a clickable button with any of the resources that I have found. The most comprehensive resource that I have found is this one: http://www.java2s.com/Code/Java/Swing-Components/ButtonTableExample.htm.
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thanks

Yes, you were right, the TableModel was causing the trouble, everything else worked fine. Somehow I had this code (probably copy and pasted from a tutorial - damn copy and pasting) in my TableModel:
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JTable with custom column model and table model not showing table header

Hello,
I am creating a JTable with a custom table model and a custom column model. However the table header is not being displayed (yes, it is in a JScrollPane). I've shrunk the problem down into a single compileable example:
Thanks for your help.
import javax.swing.*;
import javax.swing.table.*;
public class Test1 extends JFrame
 public static void main(String args[])
 JTable table;
 TableColumnModel colModel=createTestColumnModel();
 TestTableModel tableModel=new TestTableModel();
 Test1 frame=new Test1();
 table=new JTable(tableModel, colModel);
 frame.getContentPane().add(new JScrollPane(table));
 frame.setSize(200,200);
 frame.setVisible(true);
 private static DefaultTableColumnModel createTestColumnModel()
 DefaultTableColumnModel columnModel=new DefaultTableColumnModel();
 columnModel.addColumn(new TableColumn(0));
 return columnModel;
 static class TestTableModel extends AbstractTableModel
 public int getColumnCount()
 return 1;
 public Class<?> getColumnClass(int columnIndex)
 return String.class;
 public String getColumnName(int column)
 return "col";
 public int getRowCount()
 return 1;
 public Object getValueAt(int row, int col)
 return "test";
 public void setValueAt(Object aValue, int rowIndex, int columnIndex)
}Edited by: 802416 on 14-Oct-2010 04:29
added

Kleopatra wrote:
jduprez wrote:
See http://download.oracle.com/javase/6/docs/api/javax/swing/table/TableColumn.html#setHeaderValue(java.lang.Object)
When the TableColumn is created, the default headerValue is null
So, the header ends up rendered as an empty label (probably of size 0 if the JTable computes its header size based on the renderer's preferred size).nitpicking (can't resist - the alternative is a cleanup round in some not so nice code I produced recently <g>):
- it's not the JTable's business to compute its headers size (and it doesn't, the header's the culprit.) *> - the header should never come up with a zero (or near-to) height: even if there is no title shown, it's still needed as grab to resize/move the columns. So I would consider this sizing behaviour a bug.*
- furthermore, the "really zero" height is a longstanding issue with MetalBorder.TableHeaderBorder (other LAFs size with the top/bottom of their default header cell border) which extends AbstractBorder incorrectly. That's easy to do because AbstractBorder itself is badly implemented
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6459419
Thanks for the opportunity to have some fun :-)
JeanetteNo problem, thanks for the insight :)

Joining 3 tables with null values

Hi,
I have three tables that have varying data in. I want to write a query which will list all three in the result set, but when one of the tables doesn't have a row, write in No Value.
I will be intending on joining the tables with account numbers. What will be the syntax of a join with three tables where I am not sure which table will have null values?
Thanks...

Something like
select nvl(a.id,'No Value'), nvl(b.id, 'No Value'), nvl(C.id, 'No Value')
   from (select id from t1) a,
              (select id from t2) b,
              (select id from t3) c
where a.id = b.id(+)
      and a.id = c.id(+)
Hi,
I have three tables that have varying data in. I want to write a query which will list all three in the result set, but when one of the tables doesn't have a row, write in No Value.
I will be intending on joining the tables with account numbers. What will be the syntax of a join with three tables where I am not sure which table will have null values?
Thanks...

Please I need some help with a table

Hi All
I need some help with a table.
My table needs to hold prices that the user can update.
Also has a total of the column.
my question is if the user adds in a new price how can i pick up the value they have just entered and then add it to the total which will be the last row in the table?
I have a loop that gets all the values of the column, so I can get the total but it is when the user adds in a new value that I need some help with.
I have tried using but as I need to set the toal with something like total
 totalTable.setValueAt(total, totalTable.getRowCount()-1,1); I end up with an infinite loop.
Can any one please advise on some way I can get this to work ?
Thanks for reading
Craig

Hi there camickr
thanks for the help the other day
this is my full code....
package printing;
import java.awt.*;
import java.awt.event.*;
import java.awt.print.*;
import javax.swing.*;
import javax.swing.table.*;
import java.text.DecimalFormat;
public class tablePanel
 extends JDialog implements Printable {
BorderLayout borderLayout1 = new BorderLayout();
private boolean printing = false;
private Dialog1 dialog;
JPanel jPanel = new JPanel();
JTable table;
JScrollPane scrollPane1 = new JScrollPane();
DefaultTableModel model;
private String[] columnNames = {
private Object[][] data;
private String selectTotal;
private double total;
public tablePanel(Dialog1 dp) {
 dp = dialog;
 try {
 jbInit();
 catch (Exception exception) {
 exception.printStackTrace();
public tablePanel() {
 try {
 jbInit();
 catch (Exception exception) {
 exception.printStackTrace();
private void jbInit() throws Exception {
 jPanel.setLayout(borderLayout1);
 scrollPane1.setBounds(new Rectangle(260, 168, 0, 0));
 this.add(jPanel);
 jPanel.add(scrollPane1, java.awt.BorderLayout.CENTER);
 scrollPane1.getViewport().add(table);
 jPanel.setOpaque(true);
 newTable();
 addToModel();
 addRows();
 setTotal();
public static void main(String[] args) {
tablePanel tablePanel = new tablePanel();
tablePanel.pack();
tablePanel.setVisible(true);
public void setTotal() {
total = 0;
int i = table.getRowCount();
for (i = 0; i < table.getRowCount(); i++) {
 String name = (String) table.getValueAt(i, 1);
 if (!"".equals(name)) {
 if (i != table.getRowCount() - 1) {
 double dt = Double.parseDouble(name);
 total = total + dt;
String str = Double.toString(total);
table.setValueAt(str, table.getRowCount() - 1, 1);
super.repaint();
public void newTable() {
 model = new DefaultTableModel(data, columnNames) {
 table = new JTable() {
 public Component prepareRenderer(TableCellRenderer renderer,
 int row, int col) {
 Component c = super.prepareRenderer(renderer, row, col);
 if (printing) {
 c.setBackground(getBackground());
 else {
 if (row % 2 == 1 && !isCellSelected(row, col)) {
 c.setBackground(getBackground());
 else {
 c.setBackground(new Color(227, 239, 250));
 if (isCellSelected(row, col)) {
 c.setBackground(new Color(190, 220, 250));
 return c;
 table.addMouseListener(new MouseAdapter() {
 public void mouseClicked(MouseEvent e) {
 if (e.getClickCount() == 2) {
 if (e.getClickCount() == 1) {
 if (table.getSelectedColumn() == 1) {
 table.setTableHeader(null);
 table.setModel(model);
 scrollPane1.getViewport().add(table);
 table.getColumnModel().getColumn(1).setCellRenderer(new TableRenderDollar());
public void addToModel() {
 Object[] data = {
 "Price", "5800"};
 model.addRow(data);
public void addRows() {
 int rows = 20;
 for (int i = 0; i < rows; i++) {
 Object[] data = {
 model.addRow(data);
public void printOut() {
 PrinterJob pj = PrinterJob.getPrinterJob();
 pj.setPrintable(tablePanel.this);
 pj.printDialog();
 try {
 pj.print();
 catch (Exception PrintException) {}
public int print(Graphics g, PageFormat pageFormat, int pageIndex) throws PrinterException {
 Graphics2D g2 = (Graphics2D) g;
 g2.setColor(Color.black);
 int fontHeight = g2.getFontMetrics().getHeight();
 int fontDesent = g2.getFontMetrics().getDescent();
 //leave room for page number
 double pageHeight = pageFormat.getImageableHeight() - fontHeight;
 double pageWidth = pageFormat.getImageableWidth();
 double tableWidth = (double) table.getColumnModel().getTotalColumnWidth();
 double scale = 1;
 if (tableWidth >= pageWidth) {
 scale = pageWidth / tableWidth;
 double headerHeightOnPage = 16.0;
 //double headerHeightOnPage = table.getTableHeader().getHeight() * scale;
 //System.out.println("this is the hedder heigth " + headerHeightOnPage);
 double tableWidthOnPage = tableWidth * scale;
 double oneRowHeight = (table.getRowHeight() + table.getRowMargin()) * scale;
 int numRowsOnAPage = (int) ( (pageHeight - headerHeightOnPage) / oneRowHeight);
 double pageHeightForTable = oneRowHeight *numRowsOnAPage;
 int totalNumPages = (int) Math.ceil( ( (double) table.getRowCount()) / numRowsOnAPage);
 if (pageIndex >= totalNumPages) {
 return NO_SUCH_PAGE;
 g2.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
//bottom center
 g2.drawString("Page: " + (pageIndex + 1 + " of " + totalNumPages), (int) pageWidth / 2 - 35, (int) (pageHeight + fontHeight - fontDesent));
 g2.translate(0f, headerHeightOnPage);
 g2.translate(0f, -pageIndex * pageHeightForTable);
 //If this piece of the table is smaller
 //than the size available,
 //clip to the appropriate bounds.
 if (pageIndex + 1 == totalNumPages) {
 int lastRowPrinted =
 numRowsOnAPage * pageIndex;
 int numRowsLeft =
 table.getRowCount()
 - lastRowPrinted;
 g2.setClip(0,
 (int) (pageHeightForTable * pageIndex),
 (int) Math.ceil(tableWidthOnPage),
 (int) Math.ceil(oneRowHeight *
 numRowsLeft));
 //else clip to the entire area available.
 else {
 g2.setClip(0,
 (int) (pageHeightForTable * pageIndex),
 (int) Math.ceil(tableWidthOnPage),
 (int) Math.ceil(pageHeightForTable));
 g2.scale(scale, scale);
 printing = true;
 try {
 table.paint(g2);
 finally {
 printing = false;
 //tableView.paint(g2);
 g2.scale(1 / scale, 1 / scale);
 g2.translate(0f, pageIndex * pageHeightForTable);
 g2.translate(0f, -headerHeightOnPage);
 g2.setClip(0, 0,
 (int) Math.ceil(tableWidthOnPage),
 (int) Math.ceil(headerHeightOnPage));
 g2.scale(scale, scale);
 //table.getTableHeader().paint(g2);
 //paint header at top
 return Printable.PAGE_EXISTS;
class TableRenderDollar extends DefaultTableCellRenderer{
 public Component getTableCellRendererComponent(
 JTable table,
 Object value,
 boolean isSelected,
 boolean isFocused,
 int row, int column) {
 setHorizontalAlignment(SwingConstants.RIGHT);
 Component component = super.getTableCellRendererComponent(
 table,
 value,
 isSelected,
 isFocused,
 row,
 column);
 if( value == null || value .equals("")){
 ( (JLabel) component).setText("");
 }else{
 double number = 0.0;
 number = new Double(value.toString()).doubleValue();
 DecimalFormat df = new DecimalFormat(",##0.00");
 ( (JLabel) component).setText(df.format(number));
 return component;
}

Help! coloring background one row for 3 seconds in JTable with SwingTimer

Hi, I am struggling with this for the past three days but cannot come up with a solution.
I have a JTable and when i insert a new Row, i want to give that row a backgroundcolor for 3 seconds/ or let it blink for 3 seconds and then let it return to its original background color. While the current row is yellow, i want to insert a new row which also would be yellow for 3 seconds. The previous row would return white earlier than the row after, because that row is inserted earlier.
the problem is, that when i add a new row while the current row is yellow, the new row has the timer of the previous row, which means that the last row inserted will stay yellow for a shirter time, which i do not want.
i want a 3 second bgcolor for everyrow inserted. how can i achieve this ?
My code:
startBlinking() is called when a new row is being added to the JTable
public void startBlinking() throws InterruptedException{
if (timer.isRunning()){
timer.setInitialDelay(2);
timer.start();
----------------------- in another class:
//attributes
Action updateCursorAction = getAction();
Timer timer = new Timer(3000, updateCursorAction);
public Action getAction(){
updateCursorAction = new AbstractAction() {
boolean shouldDraw = false;
public void actionPerformed(ActionEvent e) {
if (shouldDraw =! shouldDraw) {
blinkingYellow();
} else{
blinkingWhite();
timer.stop();
return updateCursorAction;
public void blinkingWhite(){
receiverdata_Table.setRowSelectionInterval(0, 0);
receiverdata_Table.setSelectionBackground(Color.white);
public void blinkingYellow(){
receiverdata_Table.setRowSelectionInterval(0, 0);
receiverdata_Table.setSelectionBackground(Color.YELLOW);
}

Cant resist to point out the ease of doing something like this in Swingx <g>
Basically, the way to go is
- install a Highlighter with the visual property/ies you want to use for the highlighting effect
- update its HighlightPredicate (aka: condition for applying the property) as appropriate
Below is a code snippet (as usual runnable as-is in the context of SwingX test support). The candy is, that the exact same highlighting code is re-usable in JXList, JXTree and (probably, should check) JXComboBox
Enjoy
Jeanette
* Created on 17.12.2010
package org.jdesktop.swingx.renderer;
import java.awt.Color;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import javax.swing.Timer;
import javax.swing.table.DefaultTableModel;
import org.jdesktop.swingx.InteractiveTestCase;
import org.jdesktop.swingx.JXTable;
import org.jdesktop.swingx.decorator.AbstractHighlighter;
import org.jdesktop.swingx.decorator.ColorHighlighter;
import org.jdesktop.swingx.decorator.ComponentAdapter;
import org.jdesktop.swingx.decorator.HighlightPredicate;
public class DynamicHighlighterExperiments extends InteractiveTestCase {
 public void interactiveHighlightOnInsert() {
 final JXTable table = new JXTable(10, 4);
 final ColorHighlighter hl = new ColorHighlighter(HighlightPredicate.NEVER,
 Color.YELLOW, null);
 table.addHighlighter(hl);
 final List<Integer> recentRows = new ArrayList<Integer>();
 ActionListener l = new ActionListener() {
 @Override
 public void actionPerformed(ActionEvent e) {
 int insertedRow = table.getModel().getRowCount();
 recentRows.add(insertedRow);
 ((DefaultTableModel) table.getModel()).addRow(new Object[] {insertedRow});
 table.scrollRowToVisible(table.convertRowIndexToView(insertedRow));
 updateHighlighter(hl, recentRows, insertedRow);
 Timer insertTimer = new Timer(500, l);
 insertTimer.start();
 showWithScrollingInFrame(table, "highlight inserted rows");
 protected void updateHighlighter(final AbstractHighlighter hl,
 final List<Integer> recentRows, final Integer row) {
 hl.setHighlightPredicate(new RowHighlightPredicate(recentRows));
 ActionListener l = new ActionListener() {
 @Override
 public void actionPerformed(ActionEvent e) {
 recentRows.remove(row);
 hl.setHighlightPredicate(new RowHighlightPredicate(recentRows));
 ((Timer) e.getSource()).stop();
 Timer removeTimer = new Timer(1500, l);
 removeTimer.setRepeats(false);
 removeTimer.start();
 // PENDING JW: move into swingx zoo of predicates
 public static class RowHighlightPredicate implements HighlightPredicate {
 List<Integer> rows;
 public RowHighlightPredicate(Collection<Integer> row) {
 rows = new ArrayList<Integer>(row);
 @Override
 public boolean isHighlighted(Component renderer,
 ComponentAdapter adapter) {
 int modelRow = adapter.convertRowIndexToModel(adapter.row);
 return rows.contains(modelRow);
 public static void main(String[] args) {
 DynamicHighlighterExperiments test = new DynamicHighlighterExperiments();
 try {
 test.runInteractiveTests();
 } catch (Exception e) {
 e.printStackTrace();
}

JTable with JCheckbox problems

Ok so I have a couple of questions. I have a JTable with a column represented as a checkbox.
1. If I put the checkbox column as the first in the table, the rest of the cells are blank/null. Any idea what the reason is?
2. What is the best workaround to having draggable columns, meaning icons/checkboxes don't render if you move the columns around?
3. Does anyone have some links to good resources on JTables and things like custom components in them. I have googled but don't get many good links so would appreciate any help
Code snippet as follows:
public class ClobberTableCellRenderer implements TableCellRenderer
private JPanel renderPanel = new JPanel(new BorderLayout());
private JLabel renderLbl = new JLabel("");
private JCheckBox checked = new JCheckBox();
private Icon successIcon;
private Icon errorIcon;
public Component getTableCellRendererComponent(JTable table,
Object value,
boolean isSelected,
boolean hasFocus,
int row,
int column)
String columnName = table.getModel().getColumnName(column);
if (value == null)
return null;
else if ("Status".equals(columnName) && "ok".equals(value))
renderLbl.setIcon(successIcon);
renderLbl.setText("");
renderPanel.remove(checked);
else if ("Status".equals(columnName) && "error".equals(value))
renderLbl.setIcon(errorIcon);
renderLbl.setText("");
renderPanel.remove(checked);
else if ("Active".equals(columnName))
renderLbl.setText("");
renderPanel.add(checked);
renderPanel.setBackground(Color.white);
else
renderLbl.setHorizontalAlignment(value instanceof Date || value instanceof Number ? JLabel.RIGHT : JLabel.LEFT);
renderLbl.setIcon(null);
renderLbl.setText(value instanceof Date ? df.format((Date)value) : value.toString());
renderLbl.setToolTipText(null);
renderPanel.setToolTipText(null);
renderPanel.remove(checked);
if (isSelected)
renderPanel.setBackground((Color)UIManager.getDefaults().get("Table.selectionBackground"));
else
renderPanel.setBackground((Color)UIManager.getDefaults().get("Table.background"));
return renderPanel;
}

Hi :) I have also worked on JTables and JCheckBoxes before. This article
helped me a lot: http://www-128.ibm.com/developerworks/java/library/j-jtable/

JTable with ImageIcons does not react to even handling

Hi.
I have a populated JTable with ONLY ImageIcons in it. I need to generate event responses on mouseClicks. However, any event listener I associate with this, nothing seems to be happening.
(Somehow, I'm guess the ImageIcons - which are rendered on a JLabel, are/is the source of all troubles!!)
The code is below :
import java.io.File;
import java.awt.Point;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Container;
import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.ImageIcon;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.table.TableColumn;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.AbstractTableModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
* Entry point for the Images Table.
* @author Raj Gaurav
public class SpecialCharacterDialog extends JDialog{
 String collectionString[] = null;
 ImageIcon suite[] = null;
 public SpecialCharacterDialog() {
 Container contentPane = getContentPane();
 // Create the Table Model and create the Table from the model
 MyTableModel model = new MyTableModel();
 JTable table = new JTable(model);
 table.setDefaultRenderer(ImageIcon.class, new CustomCellRenderer());
 table.setCellSelectionEnabled(true);
 table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
ListSelectionModel rowSM = table.getSelectionModel();
rowSM.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
//Ignore extra messages.
if (e.getValueIsAdjusting()) return;
ListSelectionModel lsm = (ListSelectionModel)e.getSource();
if (lsm.isSelectionEmpty()) {
System.out.println("No rows are selected.");
} else {
int selectedRow = lsm.getMinSelectionIndex();
System.out.println("Row " + selectedRow
+ " is now selected.");
 // Add the table to the contentPane
 JScrollPane pane = new JScrollPane(table);
 contentPane.add(pane);
* This class contains all the DATA information, the ImageIcons
* needed for display.
class SymbolCollection {
 final static int NUMBER_OF_COLUMNS = 15;
 private String collectionString[] = null;
 private ImageIcon suite[] = null;
 * Constructor : Initialises all the ImageIcon and their Names.
 public SymbolCollection() {
 File f = new File("C:\\Test\\Images");
 collectionString = f.list();
 int numberOfImages = collectionString.length;
 suite = new ImageIcon[numberOfImages];
 for(int i = 0;i < numberOfImages; i++) {
 suite[i] = new ImageIcon("C:\\Test\\images" + File.separator + collectionString);
 * Returns the total number of images in "images" folder.
 public int getTotalNumberOfImages() {
 return suite.length;
 * Returns the target ImageIcon.
 public ImageIcon getImageIconAt(int number) {
 return suite[number];
 * Returns the target ImageIcon Name.
 public String getImageIconNameAt(int number) {
 return collectionString[number];
 * Returns an array of ALL the ImageIcons available.
 public ImageIcon[] getImageIcons() {
 return suite;
 * Returns an array of ALL the ImageIcon names available
 public String[] getImageIconNames() {
 return collectionString;
 * Returns TRUE for all cells
 public boolean isEditable(int row, int col) {
 return true;
* Defines the table model for the tabel.
class MyTableModel extends AbstractTableModel {
 private SymbolCollection collection = null;
 private Object data[][] = null;
 * Constructor for the TableModel. Initialises the "data" field for table.
 public MyTableModel() {
 int countOfImages = 0;
 collection = new SymbolCollection();
 data = new Object[getRowCount()][SymbolCollection.NUMBER_OF_COLUMNS];
 for(int i = 0; i < getRowCount(); i++) {
 for(int j = 0; j < SymbolCollection.NUMBER_OF_COLUMNS; j++) {
 if(countOfImages == collection.getTotalNumberOfImages()) {
 break;
 data[i][j] = collection.getImageIconAt(countOfImages);
 countOfImages++;
 * Returns the number of rows for this table.
 * It is calculated as : TotalNumber/NumberOfColumns if remainder is ZERO or,
 * TotalNumber/NumberOfColumns + 1 if not.
 public int getRowCount() {
 int numberOfRows = collection.getTotalNumberOfImages()/SymbolCollection.NUMBER_OF_COLUMNS;
 if(numberOfRows == 0) {
 return numberOfRows;
 else {
 return numberOfRows + 1;
 * Returns the number of Columns for this table
 public int getColumnCount() {
 return SymbolCollection.NUMBER_OF_COLUMNS;
 * Returns the CLASS data type for this table
 public Class getColumnClass(int col) {
 return collection.getImageIconAt(0).getClass();
 * Returns the table data at (row, col).
 public Object getValueAt(int row, int col) {
 return data[row][col];
* Renders the table to display images in individual cells
class CustomCellRenderer extends JLabel implements TableCellRenderer {
 public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int col) {
 setIcon((ImageIcon)value);
 return this;

Hi.
I have a populated JTable with ONLY ImageIcons in it. I need to generate event responses on mouseClicks. However, any event listener I associate with this, nothing seems to be happening.
(Somehow, I'm guess the ImageIcons - which are rendered on a JLabel, are/is the source of all troubles!!)
The code is below :
import java.io.File;
import java.awt.Point;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Container;
import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.ImageIcon;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.table.TableColumn;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.AbstractTableModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
* Entry point for the Images Table.
* @author Raj Gaurav
public class SpecialCharacterDialog extends JDialog{
 String collectionString[] = null;
 ImageIcon suite[] = null;
 public SpecialCharacterDialog() {
 Container contentPane = getContentPane();
 // Create the Table Model and create the Table from the model
 MyTableModel model = new MyTableModel();
 JTable table = new JTable(model);
 table.setDefaultRenderer(ImageIcon.class, new CustomCellRenderer());
 table.setCellSelectionEnabled(true);
 table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
ListSelectionModel rowSM = table.getSelectionModel();
rowSM.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
//Ignore extra messages.
if (e.getValueIsAdjusting()) return;
ListSelectionModel lsm = (ListSelectionModel)e.getSource();
if (lsm.isSelectionEmpty()) {
System.out.println("No rows are selected.");
} else {
int selectedRow = lsm.getMinSelectionIndex();
System.out.println("Row " + selectedRow
+ " is now selected.");
 // Add the table to the contentPane
 JScrollPane pane = new JScrollPane(table);
 contentPane.add(pane);
* This class contains all the DATA information, the ImageIcons
* needed for display.
class SymbolCollection {
 final static int NUMBER_OF_COLUMNS = 15;
 private String collectionString[] = null;
 private ImageIcon suite[] = null;
 * Constructor : Initialises all the ImageIcon and their Names.
 public SymbolCollection() {
 File f = new File("C:\\Test\\Images");
 collectionString = f.list();
 int numberOfImages = collectionString.length;
 suite = new ImageIcon[numberOfImages];
 for(int i = 0;i < numberOfImages; i++) {
 suite[i] = new ImageIcon("C:\\Test\\images" + File.separator + collectionString);
 * Returns the total number of images in "images" folder.
 public int getTotalNumberOfImages() {
 return suite.length;
 * Returns the target ImageIcon.
 public ImageIcon getImageIconAt(int number) {
 return suite[number];
 * Returns the target ImageIcon Name.
 public String getImageIconNameAt(int number) {
 return collectionString[number];
 * Returns an array of ALL the ImageIcons available.
 public ImageIcon[] getImageIcons() {
 return suite;
 * Returns an array of ALL the ImageIcon names available
 public String[] getImageIconNames() {
 return collectionString;
 * Returns TRUE for all cells
 public boolean isEditable(int row, int col) {
 return true;
* Defines the table model for the tabel.
class MyTableModel extends AbstractTableModel {
 private SymbolCollection collection = null;
 private Object data[][] = null;
 * Constructor for the TableModel. Initialises the "data" field for table.
 public MyTableModel() {
 int countOfImages = 0;
 collection = new SymbolCollection();
 data = new Object[getRowCount()][SymbolCollection.NUMBER_OF_COLUMNS];
 for(int i = 0; i < getRowCount(); i++) {
 for(int j = 0; j < SymbolCollection.NUMBER_OF_COLUMNS; j++) {
 if(countOfImages == collection.getTotalNumberOfImages()) {
 break;
 data[i][j] = collection.getImageIconAt(countOfImages);
 countOfImages++;
 * Returns the number of rows for this table.
 * It is calculated as : TotalNumber/NumberOfColumns if remainder is ZERO or,
 * TotalNumber/NumberOfColumns + 1 if not.
 public int getRowCount() {
 int numberOfRows = collection.getTotalNumberOfImages()/SymbolCollection.NUMBER_OF_COLUMNS;
 if(numberOfRows == 0) {
 return numberOfRows;
 else {
 return numberOfRows + 1;
 * Returns the number of Columns for this table
 public int getColumnCount() {
 return SymbolCollection.NUMBER_OF_COLUMNS;
 * Returns the CLASS data type for this table
 public Class getColumnClass(int col) {
 return collection.getImageIconAt(0).getClass();
 * Returns the table data at (row, col).
 public Object getValueAt(int row, int col) {
 return data[row][col];
* Renders the table to display images in individual cells
class CustomCellRenderer extends JLabel implements TableCellRenderer {
 public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int col) {
 setIcon((ImageIcon)value);
 return this;

Problem sorting JTable with custom cell editor

Greetings,
I have created a JTable with a JComboBox as the cell editor for the first column. However, I couldn't simply set the default cell editor for the column to be a JComboBox, since the values within the list were different for each row. So instead, I implemented a custom cell editor that is basically just a hashtable of cell editors that allows you to have a different editor for each row in the table (based on the ideas in the EachRowEditor I've seen in some FAQs - see the code below). I also used a custom table model that is essentially like the JDBCAdapter in the Java examples that populates the table with a query to a database.
The problem comes when I try to sort the table using the TableSorter and TableMap classes recommended in the Java Tutorials on JTables. All of the static (uneditable) columns in the JTable sort fine, but the custom cell editor column doesn't sort at all. I think that the problem is that the hashtable storing the cell editors never gets re-ordered, but I can't see a simple way to do that (how to know the old row index verses the new row index after a sort). I think that I could implement this manually, if I knew the old/new indexes...
Here's the code I use to create the JTable:
// Create the Table Model
modelCRM = new ContactTableModel();
// Create the Table Sorter
sorterCRM = new TableSorter(modelCRM);
// Create the table
tblCRM = new JTable(sorterCRM);
// Add the event listener for the sorter
sorterCRM.addMouseListenerToHeaderInTable(tblCRM);
Then, I populate the column for the custom cell editor like this:
// Add the combo box for editing company
TableColumn matchColumn = getTable().getColumn("Match");
RowCellEditor rowEditor = new RowCellEditor();
// loop through and build the combobox for each row
for (int i = 0; i < getTable().getRowCount(); i++) {
JComboBox cb = new JComboBox();
cb.addItem("New");
//... code to populate the combo box (removed for clarity)
rowEditor.add(i,new DefaultCellEditor(cb, i))); //TF
} // end for
matchColumn.setCellEditor(rowEditor);
Any ideas how to do this, or is there a better way to either sort the JTable or use a combobox with different values for each row? Please let me know if more code would help make this clearer...
Thanks,
Ted
import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.event.*;
public class RowCellEditor implements TableCellEditor
protected Hashtable editors;
protected TableCellEditor editor, defaultEditor;
public RowCellEditor()
editors = new Hashtable();
defaultEditor = new DefaultCellEditor(new JTextField());
public void add(int row, TableCellEditor editor)
editors.put(new Integer(row), editor);
public Component getTableCellEditorComponent(JTable table,
Object value,
boolean isSelected,
int row,
int column)
editor = (TableCellEditor) editors.get(new Integer(row));
if (editor == null)
editor = defaultEditor;
return editor.getTableCellEditorComponent(table,
value,
isSelected,
row,
column);
public Object getCellEditorValue() {
return editor.getCellEditorValue();
public boolean stopCellEditing() {
return editor.stopCellEditing();
public void cancelCellEditing() {
editor.cancelCellEditing();
public boolean isCellEditable(EventObject anEvent) {
return true; //TF
//return editor.isCellEditable(anEvent);
public void addCellEditorListener(CellEditorListener l) {
editor.addCellEditorListener(l);
public void removeCellEditorListener(CellEditorListener l) {
editor.removeCellEditorListener(l);
public boolean shouldSelectCell(EventObject anEvent) {
return editor.shouldSelectCell(anEvent);
-------------------

Well, I found a solution in another post
(see http://forum.java.sun.com/thread.jsp?forum=57&thread=175984&message=953833#955064 for more details).
Basically, I use the table sorter to translate the row index for the hashtable of my custom cell editors. I did this by adding this method to the sorter:
// This method is used to get the correct row for the custom cell
// editor (after the table has been sorted)
public int translateRow(int sortedRowIndex)
checkModel();
return indexes[sortedRowIndex];
} // end translateRow()
Then, when I create the custom cell editor, I pass in a reference to the sorter so that when the getTableCellEditorComponent() method is called I can translate the row to the newly sorted row before returning the editor from the hashtable.

Update row with more data - JTable with Abstracttablemodel

Hello!
I got some problems with my program, im using jtable with abstracttablemodel.
First I include content into the jtable by pressing ”New Content”, then it will pop up a dialog which I fill with information as you can see in the picture.
http://img42.imageshack.us/img42/6969/jtable.jpg
But when its done, I want to borrow it and update that row with more information as you can see if its loaned, if it is their shall be a checkbox, name and phone there. I don’t really know how to do this. Suppose I should do a similar metodh as when I’m adding and removing content. The question is how do I do that? I’ve been looking at some tips and hints on google. It seems to me that should use “fireTableRowsUpdated” but not really sure if its right and how to. When I’m borrowing the specific row I guess I need to check which row is clicked before borrowing and then fill in the information and update the table.The borrow button will also pop up a dialog with 3 fields to fill. Here is the code I wrote for adding and removing. I’ve tried with the update but its not right which I’m going to use when borrowing objects from the database. Please help!
Code from the abstracttablemodel
private ArrayList<Objects> obj = new ArrayList<Objects>();
 public void add(Objects o) {
 obj.add(o);
 fireTableRowsInserted(obj.size()-1, obj.size()-1);
 public void remove(int o) {
 int index = obj.indexOf(o);
 obj.remove(o);
 fireTableRowsDeleted(index, index);
 public void update (Objects o){
 // Not sure how to do here
 //int index = obj.indexOf(o);
 //fireTableRowsUpdated(index,index);
 }Code for the button in the main program.
if (arg.getSource() == borrow) {
// How should I do here? I need to implement the BorrowDialog, check if a row is pressed then update? How do I do that?
 BorrowDialog newLoan = new BorrowDialog(frame);
 if(table.getSelectedRow() == -1)
 JOptionPane.showMessageDialog(frame,"Select the row before loan");
 else
 dir.update(newLoan.getLoan());
 table.repaint();
 }Code for BorrowDialog
public class BorrowDialog extends JDialog implements ActionListener {
 //implements JTextFields, Buttons,Labels and Panels.
 public BorrowDialog(JFrame parent) {
 //Setting buttons to panels and such
 public Objects getLoan(){
 return loan;
 public void setLoan()
 // Not sure if this is right, as I leave some fields empty, will it be empty when its updating aswell?
 // I tried with add data then it just will be a new row, when I will update a specific row
 loan = new Objects("", "" , "" , "" , "" ,"", loanField.getText(),nameField.getText(), phoneField.getText());
 public void actionPerformed(ActionEvent arg) {
 if (arg.getActionCommand().equals("Save")) {
 System.out.println("save");
 setLoan();
 dispose();
}All help is appreciated!
Edited by: iTech34 on Feb 22, 2010 3:27 AM
Edited by: iTech34 on Feb 22, 2010 3:31 AM
Edited by: iTech34 on Feb 22, 2010 3:58 AM

Look up for the rest of the code!
I explained everything on the first post, so please read there so you know the problem I got.
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class Database implements ActionListener {
 private final int WIDTH = 800;
 private final int HEIGHT = 800;
 private JTable table = new JTable();
 private JFrame frame = new JFrame("Database");
 private JButton addContent = new JButton("New content");
 private JButton borrow = new JButton("Borrow");
 private JButton returnObject = new JButton("Return");
 private JButton remove = new JButton("Remove");
 private JButton save = new JButton("Save");
 private JButton load = new JButton("Load");
 private JButton exit = new JButton("Exit");
 private Directory dir = new Directory();
 private JPanel buttonPanel = new JPanel();
 private JPanel mainPanel = new JPanel();
 public Database() {
 // BUTTONS
 buttonPanel.add(addContent);
 buttonPanel.add(remove);
 buttonPanel.add(borrow);
 buttonPanel.add(returnObject);
 buttonPanel.add(save);
 buttonPanel.add(load);
 buttonPanel.add(exit);
 // ACTION LISTENERS
 addContent.addActionListener(this);
 remove.addActionListener(this);
 borrow.addActionListener(this);
 returnObject.addActionListener(this);
 save.addActionListener(this);
 load.addActionListener(this);
 exit.addActionListener(this);
 // JTABLE
 table = new JTable(dir);
 table.setAutoCreateRowSorter(true);
 table.setRowHeight(25);
 JScrollPane JScroll = new JScrollPane(table);
 // PANELS
 mainPanel.setLayout(new BorderLayout());
 mainPanel.add("North", buttonPanel);
 mainPanel.add("Center", JScroll);
 // FRAME
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.setSize(WIDTH, HEIGHT);
 frame.getContentPane().add(mainPanel);
 frame.pack();
 frame.setLocationRelativeTo(null);
 frame.setVisible(true);
 public void actionPerformed(ActionEvent arg) {
 if (arg.getSource() == addContent) {
 Dialog newDialog = new Dialog(frame);
 dir.add(newDialog.getItem());
 if (arg.getSource() == remove) {
 if (table.getSelectedRow() == -1)
 JOptionPane.showMessageDialog(frame,"Select the row before remove");
 else
 dir.remove(table.getSelectedRow());
 if (arg.getSource() == borrow) {
 // Not sure how to do here! I need to check which row I've clicked and take that row into BorrowDialog as argument i suppose.. please explain
 BorrowDialog newLoan = new BorrowDialog(frame);
 if(table.getSelectedRow() == -1)
 JOptionPane.showMessageDialog(frame,"Select the row before loan");
 else
 dir.update(newLoan.getLoan());
 table.repaint();
 if (arg.getSource() == returnObject) {
 if (arg.getSource() == save) {
 dir.writeFile();
 if (arg.getSource() == load) {
 Objects[] tempObject = dir.readFile("info.txt");
 for (int i = 0; tempObject[i] != null; i++)
 dir.add(tempObject);
 if (arg.getSource() == exit){
 frame.dispose();
 public static void main(String[] argv) {
 new Database();
}import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class BorrowDialog extends JDialog implements ActionListener {
 private final int WIDTH = 300;
 private final int HEIGHT = 400;
 private JButton exitDialog = new JButton("Exit");
 private JButton saveDialog = new JButton("Save");
 private JTextField loanField = new JTextField();
 private JTextField nameField = new JTextField();
 private JTextField phoneField = new JTextField();
 private JLabel loanLabel = new JLabel("Loan");
 private JLabel nameLabel = new JLabel("Name");
 private JLabel phoneLabel = new JLabel("Phone");
 private JPanel eastPanel = new JPanel();
 private JPanel southPanel = new JPanel();
 private JPanel westPanel = new JPanel();
 private GridLayout layout = new GridLayout(3, 1);
 private Objects loan;
 public BorrowDialog(JFrame parent) {
 super(parent, "Borrow", true);
 southPanel.add(saveDialog);
 southPanel.add(exitDialog);
 westPanel.add(loanLabel);
 eastPanel.add(loanField);
 westPanel.add(nameLabel);
 eastPanel.add(nameField);
 westPanel.add(phoneLabel);
 eastPanel.add(phoneField);
 westPanel.setLayout(layout);
 eastPanel.setLayout(layout);
 add("West", westPanel);
 add("Center", eastPanel);
 add("South", southPanel);
 saveDialog.addActionListener(this);
 exitDialog.addActionListener(this);
 setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
 setResizable(false);
 setSize(WIDTH, HEIGHT);
 getContentPane();
 setVisible(true);
 public Objects getLoan(){
 return loan;
 public void setLoan()
 // Can I really do like this? Will the the specific row I've chosen be overwriten entirly with blank elements in the six columns as I left empty(see below, when I send the arguments into the constructor)?
 loan = new Objects("", "" , "" , "" , "" ,"", loanField.getText(),nameField.getText(), phoneField.getText());
 public void actionPerformed(ActionEvent arg) {
 if (arg.getActionCommand().equals("Save")) {
 System.out.println("save");
 setLoan();
 dispose();
 if (arg.getSource() == exitDialog) {
 dispose();
Edited by: iTech34 on Feb 22, 2010 11:19 AM
Edited by: iTech34 on Feb 22, 2010 11:20 AM

TableChanged() does not work with parrent table reference

Hi,
I used this example http://www.javalobby.org/articles/jtable/ where the cells refocus after updating, but I have rewrote it to my needs and the program throws nullpointerexception when I update any cell:(
here is the tableChanged part of code:
    public class InteractiveTableModelListener implements TableModelListener {
        public void tableChanged(TableModelEvent evt) {
            if (evt.getType() == TableModelEvent.UPDATE) {
                int column = evt.getColumn();
                int row = evt.getFirstRow();
                System.out.println("updated row: " + row + " column: " + column);
               if((column + 1) >= model.getRowCount()){
                  table.removeColumnSelectionInterval(column,column);
                }else{
                  table.setColumnSelectionInterval(column + 1, column + 1);
                table.setRowSelectionInterval(row,row);
}the table reference worked in the exaple but doesnt work in my program:(
here is the init of the table in function initComponent:
        tableModel.addTableModelListener(new InteractiveTableModelListener());
        TableSorter sorter = new TableSorter(tableModel);
        JTable table = new JTable(sorter);the class is on the same level as the function
i have searched all the internet for this with no results:(
thank you for your advice!

Yes, you are right, I wrote this post in a hurry and exhaused, that it does not work.
I'm trying to write out a data file (now only a vector of data) in a JTable and I want to edit the rows and after I submit text in a cell, I want the caret to move one cell right, so the user can write another text, just like in MS Excel. At the end of the row the caret disapears but does not create another row.
And I have problems with variable JTable table in the inner class that contains method tableChanged().
Well After making an example I realized it worked and then I checked the example line by line and found out that I declare another JTable with the same name in the table initializing method,
Then the variable couldnt work in tableChanged method... It was empty...
I used your example from thread, you advised me:
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
public class TableProcessing extends JFrame implements TableModelListener
     // here I declare the table
        protected JTable table;
     public TableProcessing()
          String[] columnNames = {"Item", "Quantity", "Price", "Cost"};
          Object[][] data =
               {"Bread", new Integer(1), new Double(1.11), new Double(1.11)},
               {"Milk", new Integer(1), new Double(2.22), new Double(2.22)},
               {"Tea", new Integer(1), new Double(3.33), new Double(3.33)},
               {"Cofee", new Integer(1), new Double(4.44), new Double(4.44)}
          DefaultTableModel model = new DefaultTableModel(data, columnNames);
          model.addTableModelListener( this );
                // here I declare it again, which is a MISTAKE
          JTable table = new JTable( model )
               // Returning the Class of each column will allow different
               // renderers to be used based on Class
               public Class getColumnClass(int column)
                    return getValueAt(0, column).getClass();
               // The Cost is not editable
               public boolean isCellEditable(int row, int column)
                    int modelColumn = convertColumnIndexToModel( column );
                    return (modelColumn == 3) ? false : true;
          table.setPreferredScrollableViewportSize(table.getPreferredSize());
          JScrollPane scrollPane = new JScrollPane( table );
          getContentPane().add( scrollPane );
      * The cost is recalculated whenever the quantity or price is changed
     public void tableChanged(TableModelEvent e)
          System.out.println(e.getSource());
          if (e.getType() == TableModelEvent.UPDATE)
               int row = e.getFirstRow();
               int column = e.getColumn();
               if (column == 1 || column == 2)
                               // AND here is not initialised - throws NullPointerException
                    TableModel model = table.getModel();
                    int     quantity = ((Integer)model.getValueAt(row, 1)).intValue();
                    double price = ((Double)model.getValueAt(row, 2)).doubleValue();
                    Double value = new Double(quantity * price);
                    model.setValueAt(value, row, 3);
     public static void main(String[] args)
          TableProcessing frame = new TableProcessing();
          frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
          frame.pack();
          frame.setLocationRelativeTo( null );
          frame.setVisible(true);
}

JTable with a JCheckBox in a header column

Hi everybody,
I have implemented a JTable with a JCheckbox in one of the header columns. For this I have used the following code from the Internet for rendering the table cell:
public class CheckBoxColumnHeader extends JCheckBox implements TableCellRenderer, MouseListener {
 protected CheckBoxColumnHeader rendererComponent;
 protected int column;
 protected boolean mousePressed = false;
 public CheckBoxColumnHeader(ItemListener itemListener) {
 rendererComponent = this;
 rendererComponent.addItemListener(itemListener);
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
 if (table != null) {
 JTableHeader header = (ExtendedJTableHeader)table.getTableHeader();
 if (header != null) {
 rendererComponent.setForeground(header.getForeground());
 rendererComponent.setBackground(header.getBackground());
 rendererComponent.setFont(header.getFont());
 header.addMouseListener(rendererComponent);
 setColumn(column);
 rendererComponent.setText(value.toString());
 setBorder(UIManager.getBorder("TableHeader.cellBorder"));
 return rendererComponent;
From a technical point of view, the checkbox works as expected. However, I have problems with the graphical layout of the checkbox in the header column:
1) The checkbox seems to be bigger than the height of the header column. It overlays the border lines of the table. When I increase the preferred size of the header row, the checkbox also increases its size and still overlays the table border lines.
2) The checkbox has a diffferent background shading than the other columns in the header.
Any help for solving these two layout problems are greatly appreciated.
Thanks, Walter

Hi,
here is now the complete code
package main;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Arrays;
import java.util.Vector;
import javax.swing.table.*;
* �berschrift: 
* Beschreibung: 
* Copyright: Copyright (c) 2007
* Organisation: 
* @author unbekannt
* @version 1.0
public class MainFrame extends JFrame {
 JTable table3;
 JScrollPane scp3;
//Den Frame konstruieren
public MainFrame() {
 enableEvents(AWTEvent.WINDOW_EVENT_MASK);
 try {
 jbInit();
 catch(Exception e) {
 e.printStackTrace();
//Initialisierung der Komponenten
private void jbInit() throws Exception {
 this.setSize(new Dimension(500, 320));
 this.setTitle("Action List");
 Vector<Object> rowData = new Vector<Object>();
 for (int i=0; i<3; i++) {
 Vector<Object> colData = new Vector<Object>(Arrays.asList("Data R" + i + "C0", "Data R" + i + "C1", "Data R" + i +"C2", (i%2 == 0) ? Boolean.TRUE : Boolean.FALSE));
 rowData.add(colData);
 Vector<Object> hdr = new Vector<Object>(Arrays.asList("Column 0", "Column 1", "Column 2 (MyO)", "Column 3"));
 DefaultTableModel tableM = new DefaultTableModel(rowData, hdr);
 table3 = new JTable(tableM);
 TableColumn tc = table3.getColumnModel().getColumn(3);
 tc.setCellEditor(table3.getDefaultEditor(Boolean.class));
 tc.setCellRenderer(table3.getDefaultRenderer(Boolean.class));
 tc.setHeaderRenderer(new CheckBoxColumnHeader(table3, new MyItemListener()));
 scp3 = new JScrollPane(table3);
 scp3.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
 scp3.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED);
 this.add(scp3);
//�berschrieben, so dass eine Beendigung beim Schlie�en des Fensters m�glich ist
protected void processWindowEvent(WindowEvent e) {
 super.processWindowEvent(e);
 if (e.getID() == WindowEvent.WINDOW_CLOSING) {
 System.exit(0);
public class CheckBoxColumnHeader extends JCheckBox implements TableCellRenderer, MouseListener {
 protected CheckBoxColumnHeader rendererComponent;
 protected int column;
 protected boolean mousePressed = false;
 protected JTable myTable;
 public CheckBoxColumnHeader(JTable t, ItemListener itemListener) {
 rendererComponent = this;
 rendererComponent.addItemListener(itemListener);
 myTable = t;
 public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
 JTableHeader header = null;
 if (table != null) {
 header = (JTableHeader)table.getTableHeader();
 if (header != null) {
 rendererComponent.setForeground(header.getForeground());
 rendererComponent.setBackground(header.getBackground());
 rendererComponent.setFont(header.getFont());
 header.addMouseListener(rendererComponent);
 setColumn(column);
 rendererComponent.setText(value.toString());
 setBorder(UIManager.getBorder("TableHeader.cellBorder"));
 return rendererComponent;
 protected void setColumn(int column) {this.column = column; }
 public int getColumn() {return column; }
 protected void handleClickEvent(MouseEvent e) {
 if (mousePressed) {
 mousePressed=false;
 JTableHeader header = (JTableHeader)(e.getSource());
 JTable tableView = header.getTable();
 TableColumnModel columnModel = tableView.getColumnModel();
 int viewColumn = columnModel.getColumnIndexAtX(e.getX());
 int column = tableView.convertColumnIndexToModel(viewColumn);
 if (viewColumn == this.column && e.getClickCount() == 1 && column != -1) {
 doClick();
 public void mouseClicked(MouseEvent e) {
 handleClickEvent(e);
 ((JTableHeader)e.getSource()).repaint();
 public void mousePressed(MouseEvent e) {
 mousePressed = true;
 public void mouseReleased(MouseEvent e) { }
 public void mouseEntered(MouseEvent e) { }
 public void mouseExited(MouseEvent e) { }
 public JTable getTable() {return myTable; }
public class MyItemListener implements ItemListener {
 public void itemStateChanged(ItemEvent e) {
 CheckBoxColumnHeader source = (CheckBoxColumnHeader)e.getSource();
 if (source instanceof AbstractButton == false) return;
 boolean checked = e.getStateChange() == ItemEvent.SELECTED;
 for (int x = 0, y = source.getTable().getRowCount(); x < y; x++) {
 source.getTable().setValueAt(new Boolean(checked),x,3);
As originally said, the checkbox in the header column overlays the table borders and also has a different background shading than the other header columns.

Problem with JTable with JCheckBox as Header

Hi,
We have a JCheckBox as JTable Header. And respective data in that column also check boxes. For data check boxes, just i am sending Boolean object to object[][] data array. I am getting check Boxes as data components.
For Header, i have create a TableRender object which is returning JCheckBox.
Here my problem is,
1) When i select a Header check box, all the check boxes are getting selected.
2) Now we can reselect an data Check Box. When i reselect any data checkBox, Header CheckBox should be reselected. This is not happening. I was tried lot. Can any body give a solution to solve this problem.
Please .... Please ...
Thanks
Mohan

just call this method with null param on the JTable
table.setTableHeader(null);
cheers
krishna

How do I create a JTable with some empty cells in it?

I have a three column JTable. The first column is a String showing description. The second column contains numbers (double) and the third column also contains numbers. In some cases not all cells in a row should contain data. So for instance, I could have row one showing only description (a String in the first column), and then row two showing description (a String in the first column) and a number (a double in the second column) in columns one and two respectively. My problem is that, the data gets copied from the cells with data to the cells which are supposed to be empty. So, how do I create a JTable with some empty cells in it.

I have tried empty strings for those values, but it did not work. My table puts objects in an arraylist called reconciliation. The arraylist takes different objects with the same super class. The code below explains. Are you suggesting I pass null to my constructor?
JTable table = new JTable(new ReconTableModel());The method below is from the table model
protected List<Reconciliation> reconciliation = new ArrayList<Reconciliation>();
protected void fillModel(){
 reconciliation.add(new CashBook("Cash Book Report"," "," "));
 reconciliation.add(new CheckingBankAccount("Checking Bank Account"," "," "));
 reconciliation.add(new BankBalance("Bank Balance As Per Bank Statement",500," "));
 reconciliation.add(new PaymentVouchers("Payment Voucher Receipt",300," "));
 reconciliation.add(new DepositVoucher("Deposit Voucher Receipt",1000," "));
 reconciliation.add(new ReconciledBalance("Reconcilied Bank Balance",1200," "));
 reconciliation.add(new BalanceAt("Bank Balance At",800," "));
 reconciliation.add(new Difference("Difference",400," "));
 Collections.sort( reconciliation, new Comparator<Reconciliation>(){
 public int compare( Reconciliation a, Reconciliation b) {
 return a.getTransactionName().compareTo( b.getTransactionName());
}

JDBC MS Access--- cannot extract entry with null value with data type Meta

I'm trying to extract a data entry with null value by using JDBC. The database is MS Access.
The question is how to extract null entry with data type memo? The following code works when the label has data type Text, but it throws sqlException when the data type is memo.
Any advice will be appreciated! thanks!
Following are the table description and JDBC code:
test table has the following attributes:
Field name Data Type
name Text
label Memo
table contents:
name label
me null
you gates
Code:
String query = "SELECT name, label FROM test where name like 'me' ";
ResultSet rs = stmt.executeQuery(query);
while (rs.next())
String name = rs.getString("name");
rs.getString("val");
String label = rs.getString("label");
System.out.println("\t"+name+"\t"+label);
catch (SQLException ex)
System.out.println(ex.getSQLState());
System.out.println(ex.getErrorCode());
System.out.println("in sqlexception");
output:
C:\Temp\SEFormExtractor>java DBTest
yet SELECT name, label FROM test
null
0
in sqlexception

The question is how to extract null entry with data type memo?Okay, what you need to do is this:
if (rs.getString("val") == null)
// do something
}This way, when it's a null value, you can check it first, and then handle it how you want, rather than getting an exception.

JTable with null table headar

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