Add event(keyListener) to JTable Cell default editor.

I've got a form(Jdialog) with a Jtable on it.
I've added a keyListener to the JButtons and Jtable so that, wherever the the focus IS, when I hit the "F7" key, it fills the Jtable from the database connection.
It's working REALLY fine now but there is one small glitch.
When I'm editing a cell, the keyListener event is not thrown. I supposed it's because the "DefaultCellEditor" does not throw the event.
How can I add such a thing??
I'm looking for something like :
table.getDefaultEditor().addKeyListener
but it does not exists.
If it's not possible, is there a way to make the JDialog listen to all the keyListener events from its childs??(Mimics the JDK < 1.4)
Thx

Using key binding is better implementation.
After you read the tutorial your next move is to google for it.
http://www.google.com/search?hl=en&q=jtable+keybinding
Second result brings you to camickr's example:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=657819

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Keyboard Access For a Column in JTable with default editor as JComboBox

I want to get Key board access for a column in JTable.
The user should be able to select from a drop down list for the column with default
editor set as JComboBox.
Presently,it works fine with mouse,also I am able to focus it with Keyboard using
ALT+Up keys,but how to make drop down list appear.
Plz help,it's urgent.
Thanks in Advance

Hi,
In addition to setting DO_SUM = 'X' you need to specify function in H_FTYPE field. It should be set to 'AVG' in your case.
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How to catch the mouse event from the JTable cell of the DefaultCellEditor

Hi, my problem is:
I have a JTable with the cells of DefaultCellEditor(JComboBox) and added the mouse listener to JTable. I can catch the mouse event from any editor cell when this cell didn't be focused. However, when I click the editor to select one JComboBox element, all the mouse events were intercepted by the editor.
So, how can I catch the mouse event in this case? In other word, even if I do the operation over the editor, I also need to catch the cursor position.
Any idea will be highly appreciated!
Thanks in advance!

Hi, bbritta,
Thanks very much for your help. Really, your code could run well, but my case is to catch the JComboBox event. So, when I change the JTextField as JComboBox, it still fail to catch the event. The following is my code. Could you give me any other suggestion?
Also, any one has a good idea for my problem? I look forward to the right solution to this problem.
Thanks.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Test3
extends JFrame {
// JTextField jtf = new JTextField();
Object[] as = {"aa","bb","cc","dd"};
JComboBox box = new JComboBox(as);
public Test3() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container content = getContentPane();
String[] head = {
"One", "Two", "Three"};
String[][] data = {
"R1-C1", "R1-C2", "R1-C3"}
"R2-C1", "R2-C2", "R2-C3"}
JTable jt = new JTable(data, head);
box.addMouseListener(new MouseAdapter() {
// jtf.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e)
System.out.println("-------------------JComboBox mouseclick....");
jt.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e)
System.out.println("-------------------JTable mouseclick....");
// jt.setDefaultEditor(Object.class, new DefaultCellEditor(jtf));
jt.setDefaultEditor(Object.class, new DefaultCellEditor(box));
content.add(new JScrollPane(jt), BorderLayout.CENTER);
setSize(300, 300);
public static void main(String[] args) {
new Test3().setVisible(true);
}

How to add event handler to JTable?

I need an event listener that tells me whenever a cell has been edited. Does anyone have any ideas on how to implement this. There doesn't seem to be much documentation on the subject.
Thanks in advance..
dosteov

Hello,
It looks like you are interested in the
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be added.
Also the Outlook object model provides the
AttachmentAdd event for Outlook items. It is fired when an attachment has been added to an instance of the parent object. You can also analyze the attachment object passed as a parameter to the event handler. You will not be able to
cancel the action in that case.

Problem in event handling of combo box in JTable cell

Hi,
I have a combo box as an editor for a column cells in JTable. I have a event listener for this combo box. When ever I click on the JTable cell whose editor is combo box,
I get the following exception,
Exception occurred during event dispatching:
java.lang.NullPointerException
     at javax.swing.plaf.basic.BasicTableUI$MouseInputHandler.setDispatchComponent(Unknown Source)
     at javax.swing.plaf.basic.BasicTableUI$MouseInputHandler.mousePressed(Unknown Source)
     at java.awt.AWTEventMulticaster.mousePressed(Unknown Source)
     at java.awt.Component.processMouseEvent(Unknown Source)
     at java.awt.Component.processEvent(Unknown Source)
     at java.awt.Container.processEvent(Unknown Source)
     at java.awt.Component.dispatchEventImpl(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.run(Unknown Source)
Can any one tell me how to over come this problem.
Thanks,
Raghu

Here's an example of the model I used in my JTable. I've placed 2 comboBoxes with no problems.
Hope this helps.
public class FileModel5 extends AbstractTableModel
public boolean isEditable = false;
protected static int NUM_COLUMNS = 3;
// initialize number of rows to start out with ...
protected static int START_NUM_ROWS = 0;
protected int nextEmptyRow = 0;
protected int numRows = 0;
static final public String file = "File";
static final public String mailName = "Mail Id";
static final public String postName = "Post Office Id";
static final public String columnNames[] = {"File", "Mail Id", "Post Office Id"};
// List of data
protected Vector data = null;
public FileModel5()
data = new Vector();
public boolean isCellEditable(int rowIndex, int columnIndex)
// The 2nd & 3rd column or Value field is editable
if(isEditable)
if(columnIndex > 0)
return true;
return false;
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
public Class getColumnClass(int c)
return getValueAt(0, c).getClass();
* Retrieves number of columns
public synchronized int getColumnCount()
return NUM_COLUMNS;
* Get a column name
public String getColumnName(int col)
return columnNames[col];
* Retrieves number of records
public synchronized int getRowCount()
if (numRows < START_NUM_ROWS)
return START_NUM_ROWS;
else
return numRows;
* Returns cell information of a record at location row,column
public synchronized Object getValueAt(int row, int column)
try
FileRecord5 p = (FileRecord5)data.elementAt(row);
switch (column)
case 0:
return (String)p.file;
case 1:
return (String)p.mailName;
case 2:
return (String)p.postName;
catch (Exception e)
return "";
public void setValueAt(Object aValue, int row, int column)
FileRecord5 arow = (FileRecord5)data.elementAt(row);
arow.setElementAt((String)aValue, column);
fireTableCellUpdated(row, column);
* Returns information of an entire record at location row
public synchronized FileRecord5 getRecordAt(int row) throws Exception
try
return (FileRecord5)data.elementAt(row);
catch (Exception e)
throw new Exception("Record not found");
* Used to add or update a record
* @param tableRecord
public synchronized void updateRecord(FileRecord5 tableRecord)
String file = tableRecord.file;
FileRecord5 p = null;
int index = -1;
boolean found = false;
boolean addedRow = false;
int i = 0;
while (!found && (i < nextEmptyRow))
p = (FileRecord5)data.elementAt(i);
if (p.file.equals(file))
found = true;
index = i;
} else
i++;
if (found)
{ //update
data.setElementAt(tableRecord, index);
else
if (numRows <= nextEmptyRow)
//add a row
numRows++;
addedRow = true;
index = nextEmptyRow;
data.addElement(tableRecord);
//Notify listeners that the data changed.
if (addedRow)
nextEmptyRow++;
fireTableRowsInserted(index, index);
else
fireTableRowsUpdated(index, index);
* Used to delete a record
public synchronized void deleteRecord(String file)
FileRecord5 p = null;
int index = -1;
boolean found = false;
int i = 0;
while (!found && (i < nextEmptyRow))
p = (FileRecord5)data.elementAt(i);
if (p.file.equals(file))
found = true;
index = i;
} else
i++;
if (found)
data.removeElementAt(i);
nextEmptyRow--;
numRows--;
fireTableRowsDeleted(START_NUM_ROWS, numRows);
* Clears all records
public synchronized void clear()
int oldNumRows = numRows;
numRows = START_NUM_ROWS;
data.removeAllElements();
nextEmptyRow = 0;
if (oldNumRows > START_NUM_ROWS)
fireTableRowsDeleted(START_NUM_ROWS, oldNumRows - 1);
fireTableRowsUpdated(0, START_NUM_ROWS - 1);
* Loads the values into the combo box within the table for mail id
public void setUpMailColumn(JTable mapTable, ArrayList mailList)
TableColumn col = mapTable.getColumnModel().getColumn(1);
javax.swing.JComboBox comboMail = new javax.swing.JComboBox();
int s = mailList.size();
for(int i=0; i<s; i++)
comboMail.addItem(mailList.get(i));
col.setCellEditor(new DefaultCellEditor(comboMail));
//Set up tool tips.
DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
renderer.setToolTipText("Click for mail Id list");
col.setCellRenderer(renderer);
//Set up tool tip for the mailName column header.
TableCellRenderer headerRenderer = col.getHeaderRenderer();
if (headerRenderer instanceof DefaultTableCellRenderer)
((DefaultTableCellRenderer)headerRenderer).setToolTipText(
"Click the Mail Id to see a list of choices");
* Loads the values into the combo box within the table for post office id
public void setUpPostColumn(JTable mapTable, ArrayList postList)
TableColumn col = mapTable.getColumnModel().getColumn(2);
javax.swing.JComboBox combo = new javax.swing.JComboBox();
int s = postList.size();
for(int i=0; i<s; i++)
combo.addItem(postList.get(i));
col.setCellEditor(new DefaultCellEditor(combo));
//Set up tool tips.
DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
renderer.setToolTipText("Click for post office Id list");
col.setCellRenderer(renderer);
//Set up tool tip for the mailName column header.
TableCellRenderer headerRenderer = col.getHeaderRenderer();
if (headerRenderer instanceof DefaultTableCellRenderer)
((DefaultTableCellRenderer)headerRenderer).setToolTipText(
"Click the Post Office Id to see a list of choices");
}

JTextField in a JTable cell

Hi,
I have just started coding in Swings and would like to find out ways by which I can add JtextField in a JTable cell. Is there any?
Thanks in Advance.
Cheena

There sure is. The thing you're looking for is the cells TableCellEditor. Check out this tutorial, it will explain how to use CellEditors, you should have no diffculties adapting the example to your needs (otherwise just post again :-)
http://java.sun.com/docs/books/tutorial/uiswing/components/table.html

Adding JButton into JTable cells

Hi there!!
I want to add a JButton into JTable cells.In fact I have got two classes.Class2 has been extended from the AbstractTableModel class and Class1 which is using Class2's model,,,here's the code,,
Class1
import javax.swing.JScrollPane;
import javax.swing.JTable;
public class Class1 extends javax.swing.JFrame {
   //////GUI specifications
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new TestTableButton().setVisible(true);
        Class2 model=new Class2();
        jTable1=new JTable(model);
        jScrollPane1.setViewportView(jTable1);
    // Variables declaration - do not modify
    private javax.swing.JScrollPane jScrollPane1;
    // End of variables declaration
    private javax.swing.JTable jTable1;
}Class2
import javax.swing.table.*;
public class Class2 extends AbstractTableModel{
    private String[] columnNames = {"A","B","C"};
    private Object[][] data = {
    public int getColumnCount() {
        return columnNames.length;
    public int getRowCount() {
        return data.length;
    public String getColumnName(int col) {
        return columnNames[col];
    public Object getValueAt(int row, int col) {
        return data[row][col];
    public Class getColumnClass(int c) {
        return getValueAt(0, c).getClass();
     * Don't need to implement this method unless your table's
     * editable.
    public boolean isCellEditable(int row, int col) {
        //Note that the data/cell address is constant,
        //no matter where the cell appears onscreen.
            return false;
     * Don't need to implement this method unless your table's
     * data can change.
    public void setValueAt(Object value, int row, int col) {
        data[row][col] = value;
        fireTableCellUpdated(row, col);
}what modifications shud I be making to the Class2 calss to add buttons to it?
Can anybody help plz,,,,,??
Thanks in advance..

Hi rebol!
I did search out a lot for this but I found my problem was a bit different,,in fact I want to use another class's model into a class being extended by JFrame,,so was a bit confused,,,hope you can give me some ideas about how to handle that scenario,,I know this topic has been discussed before here many a times and also have visited this link,,
http://forum.java.sun.com/thread.jspa?threadID=465286&messageID=2147913
but am not able to map it to my need,,,hope you can help me a bit...
Thanks .....

How can I add KeyListener to JTable editor

Hi, I want to know how can I add a KeyListener to a JTable editor?
I want to capture the event when any of the cell in the jtable has a key typed.

If your goal is to check the entered value, it's more elegant to do this in overriding
DefaultCellEditor#stopCellEditing and return false when the value is not correct.
Example from a DateEditor:
        @Override public boolean stopCellEditing() {
            String value = ((JTextField)getComponent()).getText();
            if(!value.equals("")) {
                try {
                    formatterE.parse(value);
                } catch (ParseException e) {
                    ((JComponent)getComponent()).setBorder(new LineBorder(Color.red));
                    return false;
            return super.stopCellEditing();
        }

Tab transversal while using JTextArea as a JTable cell editor..

I'm working on a project that will use a JTable with a JTextArea cell editor to create a chart for classroom scheduling. Searching on Google, I found a way to use a JTextArea as a cell editor and render the cell properly. However, when editing a cell, pressing the Tab key inserts a tab, rather than leaving the cell and going to the next one, as happens with just a regular JTable. In fact, none of the keyboard shortcuts that work on a JTable work once the JTextArea cell editor is used. Does anyone know of any way to resolve this? Below is some code I'm using to create a sample GUI, just to verify that I can do this. Another question is would it be easier to use a bunch of JLabels and JTextAreas, remove the padding from those JTextAreas, and try to allow for Tab transversals between stand-alone JTextAreas, rather than JTextAreas as JTable cell editors?
Thanks!
package edu.elon.table;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
public class GUI
     private JFrame frame;
     private String[] columnNames = {"Classroom", "8:00-9:10", "9:25-10:35",
          "10:50-12:00", "12:15-1:25", "1:40-2:50", "1:40-3:20 (MW)",
          "3:35-5:15 (MW)", "5:30-7:10 (MW)"};
     private Object[][] data = {columnNames,
          {"ALAM 201 (42)\nENG 110 LAB", "", "", "", "", "", "", "", ""},
          {"ALAM 202 (42)\nDP/DVD", "", "", "", "", "", "", "", ""},
          {"ALAM 203 (38)\nDP/DVD", "", "", "", "", "", "", "", ""},
          {"ALAM 205 (40)\n", "", "", "", "", "", "", "", ""},
          {"ALAM 206 (39)\nSINK, TV/VCR", "", "", "", "", "", "", "", ""},
          {"ALAM 207 (40+)\nDP/DVD", "", "", "", "", "", "", "", ""},
          {"ALAM 214 (38)\nTV/VCR", "", "", "", "", "", "", "", ""},
          {"ALAM 215 (42)\nTV/VCR", "", "", "", "", "", "", "", ""},
          {"ALAM 216 (42)\n", "", "", "", "", "", "", "", ""},
          {"ALAM 301 (40)\nTV/VCR", "", "", "", "", "", "", "", ""},
          {"ALAM 302 (38)\nDP/DVD", "", "", "", "", "", "", "", ""},
          {"ALAM 304 (35)\nFRENCH", "", "", "", "", "", "", "", ""},
          {"ALAM 314 (30)\nDP, PSY, COMPUTER ASSISTED", "", "", "", "", "", "",
          {"ALAM 315 (40)\nPC LAB, DP/DVD", "", "", "", "", "", "", "", ""}};
     private JTable table;
     public GUI()
          frame = new JFrame();
          table = new JTable(data, columnNames);
          table.setRowHeight(table.getRowHeight()*2);
          TableColumnModel cModel = table.getColumnModel();
          TextAreaRenderer renderer = new TextAreaRenderer();
          TextAreaEditor editor = new TextAreaEditor();
          for (int i = 0; i < cModel.getColumnCount(); i++)
               cModel.getColumn(i).setCellRenderer(renderer);
               cModel.getColumn(i).setCellEditor(editor);
          frame.setLayout(new GridLayout(1,0));
          frame.add(table);
          frame.pack();
          frame.setVisible(true);
public static void main (String[] args)
GUI gui = new gui();
* Written by Dr. Heinz Kabutz, found through online newsletter via Google.
class TextAreaRenderer extends JTextArea
implements TableCellRenderer {
private final DefaultTableCellRenderer adaptee =
new DefaultTableCellRenderer();
/** map from table to map of rows to map of column heights */
private final Map cellSizes = new HashMap();
public TextAreaRenderer() {
setLineWrap(true);
setWrapStyleWord(true);
public Component getTableCellRendererComponent(//
JTable table, Object obj, boolean isSelected,
boolean hasFocus, int row, int column) {
// set the colours, etc. using the standard for that platform
adaptee.getTableCellRendererComponent(table, obj,
isSelected, hasFocus, row, column);
setForeground(adaptee.getForeground());
setBackground(adaptee.getBackground());
setBorder(adaptee.getBorder());
setFont(adaptee.getFont());
setText(adaptee.getText());
// This line was very important to get it working with JDK1.4
TableColumnModel columnModel = table.getColumnModel();
setSize(columnModel.getColumn(column).getWidth(), 100000);
int height_wanted = (int) getPreferredSize().getHeight();
addSize(table, row, column, height_wanted);
height_wanted = findTotalMaximumRowSize(table, row);
if (height_wanted != table.getRowHeight(row)) {
table.setRowHeight(row, height_wanted);
return this;
private void addSize(JTable table, int row, int column,
int height) {
Map rows = (Map) cellSizes.get(table);
if (rows == null) {
cellSizes.put(table, rows = new HashMap());
Map rowheights = (Map) rows.get(new Integer(row));
if (rowheights == null) {
rows.put(new Integer(row), rowheights = new HashMap());
rowheights.put(new Integer(column), new Integer(height));
* Look through all columns and get the renderer. If it is
* also a TextAreaRenderer, we look at the maximum height in
* its hash table for this row.
private int findTotalMaximumRowSize(JTable table, int row) {
int maximum_height = 0;
Enumeration columns = table.getColumnModel().getColumns();
while (columns.hasMoreElements()) {
TableColumn tc = (TableColumn) columns.nextElement();
TableCellRenderer cellRenderer = tc.getCellRenderer();
if (cellRenderer instanceof TextAreaRenderer) {
TextAreaRenderer tar = (TextAreaRenderer) cellRenderer;
maximum_height = Math.max(maximum_height,
tar.findMaximumRowSize(table, row));
return maximum_height;
private int findMaximumRowSize(JTable table, int row) {
Map rows = (Map) cellSizes.get(table);
if (rows == null) return 0;
Map rowheights = (Map) rows.get(new Integer(row));
if (rowheights == null) return 0;
int maximum_height = 0;
for (Iterator it = rowheights.entrySet().iterator();
it.hasNext();) {
Map.Entry entry = (Map.Entry) it.next();
int cellHeight = ((Integer) entry.getValue()).intValue();
maximum_height = Math.max(maximum_height, cellHeight);
return maximum_height;
* Written by Dr. Heinz Kabutz, found through online newsletter via Google.
class TextAreaEditor extends DefaultCellEditor
public TextAreaEditor() {
     super(new JTextField());
final JTextArea textArea = new JTextArea();
textArea.setWrapStyleWord(true);
textArea.setLineWrap(true);
JScrollPane scrollPane = new JScrollPane(textArea);
scrollPane.setBorder(null);
editorComponent = scrollPane;
delegate = new DefaultCellEditor.EditorDelegate() {
public void setValue(Object value)
textArea.setText((value != null) ? value.toString() : "");
public Object getCellEditorValue()
return textArea.getText();
}

Using the KeyEvent manager and playing around with the JTextArea, I was able to get a JTable using JTextAreas as the cell editors that worked very close to the way the regular JTable works. You have to hit Tab twice to shift focus to another cell, or hit Tab once and then an arrow key. Also, Alt-Enter will allow you to enter a cell for editing. All of the changes were made to the TextAreaEditor class, which should now read as follows:
class TextAreaEditor extends DefaultCellEditor implements KeyListener
     private int lastKeyCode;
     public TextAreaEditor(final JTable table) {
          super(new JTextField());
          lastKeyCode = KeyEvent.CTRL_DOWN_MASK;
          final JTextArea textArea = new JTextArea();
          textArea.setWrapStyleWord(true);
          textArea.setLineWrap(true);
          textArea.addKeyListener(this);
          textArea.setFocusable(true);
          textArea.setFocusAccelerator((char) KeyEvent.VK_ENTER);
          JScrollPane scrollPane = new JScrollPane(textArea);
          scrollPane.setBorder(null);
          scrollPane.setFocusable(false);
          editorComponent = scrollPane;
          delegate = new DefaultCellEditor.EditorDelegate() {
               public void setValue(Object value) {
                    textArea.setText((value != null) ? value.toString() : "");
               public Object getCellEditorValue() {
                    return textArea.getText();
     public void keyTyped(KeyEvent ke)
          // TODO Auto-generated method stub
     public void keyPressed(KeyEvent ke)
          if (ke.getKeyCode() == KeyEvent.VK_TAB)
               ke.consume();
               KeyboardFocusManager.getCurrentKeyboardFocusManager()
                         .focusNextComponent();
               return;
          if (ke.getKeyCode() == KeyEvent.VK_TAB && ke.isShiftDown())
               ke.consume();
               KeyboardFocusManager.getCurrentKeyboardFocusManager()
                         .focusPreviousComponent();
               return;
          if ((lastKeyCode == KeyEvent.CTRL_DOWN_MASK) &&
                    (ke.getKeyCode() == KeyEvent.VK_ENTER))
               ke.consume();
               editorComponent.requestFocus();
          else
               lastKeyCode = ke.getKeyCode();
     public void keyReleased(KeyEvent ke)
          // TODO Auto-generated method stub
     }

Setting JTable cell editor

Hallo,
I have troubles setting jtable cell edtior. when i run code below, editor stays unchnaged.
Do you know where's the problem, please (except in programmer^_^) ???
import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class Test extends JFrame {
    JTable table;
    Test() {
        // Create table model
        table = new JTable();
        table.setModel(new DefaultTableModel(
            new Object[][] {
                { Boolean.TRUE, Integer.valueOf(10) },
                { "Hallo!", Boolean.FALSE },
            }, new String[] { "Col1", "Col2" }));
        // Setup frame a little
        setLayout(new BorderLayout());
        setBounds(new Rectangle(300,300,200,100));
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        add(table,BorderLayout.CENTER);
         * Two calls below have no effect:-(
         * What did i wrong?
        // set cell editor for all cells
        table.setCellEditor(new DefaultCellEditor(
                new JComboBox(new String[] { "0", "1" }) ));
        // Use checkbox for booleans
        table.setDefaultEditor(Boolean.class, new DefaultCellEditor(
                new JCheckBox() ));
        // Use combobox for strings
        table.setDefaultEditor(String.class, new DefaultCellEditor(
                new JComboBox( new String[] { "Hallo!", "Bye!" } ) ));
    public static void main(String[] arg) {
        Test test = new Test();
        test.setVisible(true);
}

Hi again,
yes it works when i set it for single column, but i'd like to use default editor, because column count is not fixed.
According to documentation: "Sets a default cell editor to be used if no editor has been set in a TableColumn. If no editing is required in a table, or a particular column in a table, uses the isCellEditable method in the TableModel interface to ensure that this JTable will not start an editor in these columns. If editor is null, removes the default editor for this column class."
So when i call
column.setCellEditor(null); in TableColumnModelListener columnAdded event. But still it's not working. See sample below (i've changed it to cell renderer coz result is clear on single view, but problem stays same)
More over problem seems to be with algoritm that decide which class to use. Object takes preference any time. W/o it npe arries.
Regards
Adam
import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class Test extends JFrame {
    JTable table;
    Test() {
        // Create table model
        table = new JTable();
        table.setModel(new DefaultTableModel(
            new Object[][] {
                { Boolean.TRUE, Integer.valueOf(10) },
                { "Hallo!", Boolean.FALSE },
            }, new String[] { "Col1", "Col2" }));
        // Setup frame a little
        setLayout(new BorderLayout());
        setBounds(new Rectangle(300,300,200,100));
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        add(table,BorderLayout.CENTER);
        table.setDefaultRenderer(Object.class,new Renderer(Color.YELLOW));
        table.setDefaultRenderer(String.class,new Renderer(Color.BLUE));
        table.setDefaultRenderer(Boolean.class,new Renderer(Color.RED));
        table.setDefaultRenderer(Integer.class,new Renderer(Color.GREEN));
        // use default renderer in all columns
        table.getColumn(table.getColumnName(0)).setCellRenderer(null);
        table.getColumn(table.getColumnName(0)).setCellRenderer(null);
    public static void main(String[] arg) {
        Test test = new Test();
        test.setVisible(true);
    class Renderer extends DefaultTableCellRenderer {
        Color color;
        Renderer(Color color) { this.color = color; }
        public Component getTableCellRendererComponent(JTable table, Object value,
                boolean isSelected, boolean hasFocus, int row, int column) {
            super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
            setBackground(color);
            setToolTipText("Class is "+value.getClass().getName());
            return this;
}Message was edited by:
a3cchan

Floating Height of JTextArea (as Renderer/Editor) in a JTable Cell

Hey Folks,
I'm kinda struggling with JTextAreas...
There is this JTable, which consists of three colums (practically there are two - the other one's an ID-Field...) and only one
of them ist editable für users.
Left column is a commentary column which has a max of 150 characters - Right column fills automaticly with a user/date stamp.
The main function is that on showing the table, old comments will be retrieved from database and new ones can be entered.
This works all fine and is no matter of subject...
The core of my problem is that there seems to be no straigh-forward way of determine a proper linecount from (a wordwrapped!) JTextArea.
After a long search in the net, i found this approach:
    private static ArrayList<String> getWrappedLines(JTextArea myTextArea) {
        ArrayList<String> linesList = new ArrayList<String>();
        int length = myTextArea.getDocument().getLength();
        int offset = 0;
        try {
            while (offset < length) {
                int end = Utilities.getRowEnd(myTextArea, offset);
                if (end < 0) {
                    break;
                // Include the last character on the line
                end = Math.min(end + 1, length);
                String line =
                    myTextArea.getDocument().getText(offset, end - offset);
                // Remove the line break character
                if (line.endsWith("\n")) {
                    line = line.substring(0, line.length() - 1);
                linesList.add(line);
                offset = end;
        } catch (BadLocationException e) {
            System.err.println("Bad Location at TextArea");
        return linesList;
    }    This code reads the content of a JTextArea an separates wrapped lines in an array.
With manual line breaks ("\n") I get Exceptions (Bad Location) which isn't too bad, because
I was trying to ban manual line breaks anyway...
The above given method retrieves the lines, while the next sets the new Height (line count multiplied by Font Height) to the row.
    public static void setOptimalRowHeight(JTable table, JTextArea textArea, int row, int column) {
        if (
            row >= 0 &&
            column == VerwaltungsnotizController.IND_VNO_NOTIZ
            int fontHeight =
                textArea.getFontMetrics(textArea.getFont()).getHeight();
            ArrayList<String> wrappedLines = getWrappedLines(textArea);
            int nrOfLines = wrappedLines.size();
            int oldSize = table.getRowHeight(row);
            int newSize = (fontHeight * nrOfLines) + 5;
            if (newSize != oldSize) {
                table.setRowHeight(row, newSize);
     public static void setOptimalRowHeight(JTable table, JTextArea textArea) {
     int row = table.getSelectedRow();
     int column = table.getSelectedColumn();
     if (
          row >= 0 &&
          column == VerwaltungsnotizController.IND_VNO_NOTIZ
          setOptimalRowHeight(table, textArea, row, column);
     }The above combined Sources are used by two classes, which are "tied" to the table.
One is the CellEditor (which works almost fine); the other one is the CellRenderer (which fails miserably!)
CellEditor (with Listener):
public class VnoCellEditor extends AbstractCellEditor implements TableCellEditor {
    private VnoTextArea textArea;
    private JTable table;
    public VnoCellEditor (JTable table) {
        this.table = table;
        textArea = new VnoTextArea(table);
        textArea.setMaximumInputLength(VerwaltungsnotizController.MAX_INPUT_VNO);
        textArea.addKeyListener(new TextAreaEnterAdapter());
        textArea.setLineWrap(true);
        textArea.setWrapStyleWord(true);
        Document document = textArea.getDocument();
        document.addDocumentListener(new VnoTextAreaDocListener(table, textArea));
    public Component getTableCellEditorComponent(JTable table, Object value,
                                                 boolean isSelected, int row,
                                                 int column) {
        if (value instanceof String) {
            textArea.setText((String)value);
        } else if (value instanceof Integer) {
            Integer intValue = (Integer)value;
            textArea.setText(intValue.toString());
        } else {
            Object objValue = value;
            textArea.setText(objValue.toString());
        System.err.println("Editor - get Component");
        return textArea;
    public Object getCellEditorValue() {
        return textArea.getText();
public class VnoTextAreaDocListener implements DocumentListener {
    private JTable table;
    private JTextArea textArea;
    public VnoTextAreaDocListener(JTable table, JTextArea textArea) {
        this.table = table;
        this.textArea = textArea;
    public void insertUpdate(DocumentEvent e) {
        VnoTableRowHeightHelper.setOptimalRowHeight(table, textArea);
    public void removeUpdate(DocumentEvent e) {
        VnoTableRowHeightHelper.setOptimalRowHeight(table, textArea);
    public void changedUpdate(DocumentEvent e) {
        //Plain text components don't fire these events
}As said the editor works almost as planned. On every Keystroke made in Edit-Mode of the table, insertUpdate() or removeUpdate()
is being called, corresponding to the type of Keystroke ... (duh!)
The Helpers method is called and the row-height is set real nicely.
!But!
when i navigate into an other row, a removeUpdate()-event is beeing thrown and due to the mechanism the cell selection
gets somehow mixed around and row-heights get switched.
Maybe this could get improved, but i don't se my error - which wouldn't be nescessary if this event wasn't thrown.
(for what I don't see a reason anyway ... !)
CellRenderer:
public class VnoCellRenderer implements TableCellRenderer {
    private VnoTextArea textArea;
    private int Row = -1;
    private int Column = -1;
    private VnoTableModel jtmVno;
    public VnoCellRenderer(JTable table) {
        this.jtmVno = (VnoTableModel)table.getModel();
        textArea = new VnoTextArea(table);
        textArea.setLayout(new BorderLayout());
        textArea.setLineWrap(true);
        textArea.setWrapStyleWord(true);
    public VnoTextArea getTextArea() {
        return textArea;
    public Component getTableCellRendererComponent(JTable table, Object value,
                                                   boolean isSelected,
                                                   boolean hasFocus, int row,
                                                   int column) {
        Row = row;
        Column = column;
        String tmpValue = null;
        if (value instanceof String) {
            tmpValue = (String)value;
        } else if (value instanceof Integer) {
            tmpValue = ((Integer)value).toString();
        } else {
            tmpValue = value.toString();
        // FARBEN:
        // Normalmodus
        if (jtmVno == null) {
            System.err.println("Table Model noch nicht initialisiert!");
            textArea.setBackground(Color.LIGHT_GRAY);
        } else {
            if (jtmVno.isCellEditable(Row, Column)) {
                textArea.setBackground(Color.WHITE);
            } else {
                textArea.setBackground(Color.LIGHT_GRAY);
        textArea.setForeground(Color.BLACK);
        // Für ausgewählte Zeile
        if (isSelected && !hasFocus) {
            textArea.setBackground(CommonConstants.SELECTION_COLOR_BLUE);
            textArea.setForeground(Color.WHITE);
        textArea.setText(tmpValue);
        textArea.setEditable(true);
        if (Column == VerwaltungsnotizController.IND_VNO_NOTIZ) {
            VnoTableRowHeightHelper.setOptimalRowHeight(table, textArea, row, column);
        return textArea;
}Okay, this is where the shit hits the fan!
Since with renderers there is no manual content mutation, row-height-settings are not done with listeners.
I put this at the very end of the getTableCellRendererComponent(), which is called every time a cell gets rendered.
The main problem here is that at this point my methods can't determine any linewraps at all!
getWrappedLines() always returns an empty Array (since Utilities.getRowEnd() returns "-1" beforehand...).
I'm afraid that my methods are called way too early - at a point were the rendering is not completed or has not even started.
And to accomplish my desired tasks the fully rendered JTextArea would be needed ... ?!
I have very limited swing experience, so I can only guess about this core features ...
But i this is the case - my methods should be called later on the rendered cell. But how? from which component?
Btw: I have written my own JTextArea to limit the input size
public class VnoTextArea extends JTextArea {
    private JTable table;
    private int _maximumInputLength = 0;
    public VnoTextArea(JTable table) {
        this.table = table;
    public void setMaximumInputLength(int maximumInputLength) {
      if (maximumInputLength != 0) {
        _maximumInputLength = maximumInputLength;
        super.setDocument(new PlainDocument() {
            public void insertString(int offset, String string, AttributeSet attributeSet) throws BadLocationException {
              StringBuffer buffer = new StringBuffer(string);
              int size = VnoTextArea.this.getText().length();
              int bufferSize = buffer.length();
              if ((size + bufferSize) > _maximumInputLength) {
                buffer.delete((_maximumInputLength - size), bufferSize);
              if (size < _maximumInputLength) {
                super.insertString(offset, buffer.toString(), attributeSet);
              } else {
                Toolkit.getDefaultToolkit().beep();
}I'm sorry for not providing a running example, but it's a pretty huge project...
Providing all dependencies would go far beyond the scope.
(and there are many sources which I'm not allowed to post)
But I hope my examples get down to the core of my problem!
I also tried different approaches:
- using getPreferredSize() of the JTextArea (seemed to do nothing useful at all?!)
- using getLineCount/() of the TextArea (only counts "\n" ...)
- guessing that every row consist of an average of 20 characters cumpute by myself (low-tech, buggy but fast - unsatisfying)
With my above mentioned approach I got by far the best results (partially) - but I'm at my wits' end.
I don't know it any better... And i have tried for days without improvement.
What would you do?
vielen Dank im Voraus schon mal für eventuelle Mühen,
Haye

no solution - just a couple of comments:
- never ever change the calling table in a renderer, I mean really NEVER
- instead, listen to table events and resize the row height as appropriate
- JTextArea has a somehow weird prefSize calculation (forgot the details, so don't nail me :), so you have to manually set one dimension and then ask the area to calculate the other. In your renderer, you can do something like:
Component getTableCellRendererComponent(....) {
    int columnWidth = table.getColumnModel().getColumn(column).getWidth();
    textArea.setSize(columnWidth, Short.MAX_VALUE);
    ... here do the normal config
// then somewhere else, triggered by appropriate change events
void updateRowHeight(JTable table, int row) {
   int height = table.getRowHeight();
   foreach column {
         TableCellRenderer r = table.getCellRenderer(row, column);
         Component c = table.prepareCellRenderer(r, row, column);
         height = Math.max(height, c.getPreferredSize().height);
   table.setRowHeight(row, height);
} HTH - ein bißchen wenigstens :-)
Jeanette

AutoComplete JComboBox As JTable cell editor

Hello, when I try to use AutoComplete JComboBox as my JTable cell editor, I facing the following problem
1) Exception thrown when show pop up. - Exception in thread "AWT-EventQueue-0" java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location
2) Unable to capture enter key event.
Here is my complete working code. With the same JComboBox class, I face no problem in adding it at JFrame. But when using it as JTable cell editor, I will have the mentioned problem.
Any advice? Thanks
import javax.swing.*;
import javax.swing.JTable.*;
import javax.swing.table.*;
import java.awt.event.*;
* @author yccheok
public class NewJFrame extends javax.swing.JFrame {
    /** Creates new form NewJFrame */
    public NewJFrame() {
        initComponents();
                /* Combo Box Added In JFrame. Work as expected. */
                final JComboBox comboBox = new JComboBox();
                comboBox.addItem("Snowboarding");
                comboBox.addItem("Rowing");
                comboBox.addItem("Chasing toddlers");
                comboBox.setEditable(true);
                comboBox.getEditor().getEditorComponent().addKeyListener(new KeyAdapter() {
                   public void keyReleased(KeyEvent e) {
                       if(e.getKeyCode() == KeyEvent.VK_ENTER) {
                           System.out.println("is enter");
                           return;
                       System.out.println("typed");
                       comboBox.setSelectedIndex(0);
                       comboBox.showPopup();
                getContentPane().add(comboBox, java.awt.BorderLayout.SOUTH);
    public JTable getMyTable() {
        return new JTable() {
             Combo Box Added In JTable as cell editor. Didn't work as expected:
             1. Exception thrown when show pop up.
             2. Unable to capture enter key event.
            public TableCellEditor getCellEditor(int row, int column) {
                final JComboBox comboBox = new JComboBox();
                comboBox.addItem("Snowboarding");
                comboBox.addItem("Rowing");
                comboBox.addItem("Chasing toddlers");
                comboBox.setEditable(true);
                comboBox.getEditor().getEditorComponent().addKeyListener(new KeyAdapter() {
                   public void keyReleased(KeyEvent e) {
                       if(e.getKeyCode() == KeyEvent.VK_ENTER) {
                           System.out.println("is enter");
                           return;
                       System.out.println("typed");
                       comboBox.setSelectedIndex(0);
                       comboBox.showPopup();
                return new DefaultCellEditor(comboBox);
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    // <editor-fold defaultstate="collapsed" desc=" Generated Code ">
    private void initComponents() {
        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = getMyTable();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null}
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4"
        jScrollPane1.setViewportView(jTable1);
        getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);
        pack();
    }// </editor-fold>
     * @param args the command line arguments
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
    // Variables declaration - do not modify
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable1;
    // End of variables declaration
}

You need to create a custom CellEditor which will prevent these problems from occurring. The explanation behind the problem and source code for the new editor can be found at Thomas Bierhance's site http://www.orbital-computer.de/JComboBox/. The description of the problem and the workaround are at the bottom of the page.

Custom JTable cell editor problem

I have a custom JTable cell editor which is a JPanel with 2 JtextFields, One for a name, the other for a data value. My problem lies in when the the cell is selected and then the user start typing. The JTextfield outline shows up, but there is no carat. I can only edit the cell when I click the mouse in it again. I have my isCellEditable method set to only allow editing on 2 mouse clicks, but I did try it with just returning true and had the same problem. Please help.
Code:
class cellValue {
String name;
String data;
Color nameColor;
Color dataColor;
Font font;
public cellValue(String n, String d, Color nC, Color dC, Font ff){
name = n;
data = d;
nameColor = nC;
dataColor = dC;
font = ff;
} //end class
public class TextFieldCellEditor extends JPanel implements TableCellRenderer, TableCellEditor{
private EventListenerList listenerList = new EventListenerList();
private ChangeEvent event = new ChangeEvent(this);
private cellValue s;
private int e_row=0;
private int e_col=0;
private JTextField ta;
private JTextField tb;
public TextFieldCellEditor() {
setLayout(new GridBagLayout());
ta = new JTextField();
tb = new JTextField();
tb.setHorizontalAlignment(SwingConstants.RIGHT);
add(ta, new GridBagConstraints(0,0,1,1,0.6,0.0,java.awt.GridBagConstraints.WEST,java.awt.GridBagConstraints.BOTH,new Insets(0,1,0,0),0,0));
add(new JLabel(" "),new GridBagConstraints(1,0,1,1,0.1,0.0,java.awt.GridBagConstraints.WEST,java.awt.GridBagConstraints.BOTH,new Insets(0,1,0,0),0,0));
add(tb, new GridBagConstraints(2,0,1,1,0.3,0.0,java.awt.GridBagConstraints.EAST,java.awt.GridBagConstraints.BOTH,new Insets(0,1,0,0),0,0));
} //end init
public Component getTableCellRendererComponent(JTable table, Object value,boolean isSelected,
boolean hasFocus,int row, int column) {
s = (cellValue)value;
e_row = row;
e_col = column;
ta.setText(s.name);
tb.setText(s.data);
ta.setFont(s.font);
tb.setFont(s.font);
ta.setForeground(s.nameColor);
tb.setForeground(s.dataColor);
setForeground(table.getForeground());
setBackground(table.getBackground());
ta.setBackground(table.getBackground());
tb.setBackground(table.getBackground());
ta.setCaretColor(Color.WHITE);
tb.setCaretColor(Color.WHITE);
return (JComponent)(this);
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
return (getTableCellRendererComponent(table, value,isSelected, true, row, column));
public boolean isCellEditable(EventObject e) {
if (e instanceof MouseEvent) {
return ((MouseEvent)e).getClickCount() >= 2;
} return true;
// return true;
public boolean shouldSelectCell(EventObject anEvent) {
return (true);
public void cancelCellEditing() {
public boolean stopCellEditing() {
fireEditingStopped();
return (true);
public Object getCellEditorValue() {
return (ta.getText());
public void addCellEditorListener(CellEditorListener l){
try {
SwingUtilities.invokeLater(
new Runnable() {
public void run() {requestFocus();}
} catch (Exception e) {};
listenerList.add(CellEditorListener.class, l);
public void removeCellEditorListener(CellEditorListener l) {
listenerList.remove(CellEditorListener.class, l);
protected void fireEditingStopped(){
Object[] listeners = listenerList.getListenerList();
for (int i = listeners.length - 2; i >= 0; i -= 2)
((CellEditorListener)listeners[i+1]).editingStopped(event);
protected void fireEditingCanceled() {
Object[] listeners = listenerList.getListenerList();
for (int i = listeners.length - 2; i >= 0; i -= 2)
((CellEditorListener)listeners[i+1]).editingCanceled(event);
} //end class

Thanks again for the repley.
I tried removing the celleditorlistener and using the setSurrenderFocusOnKeystroke, but it did not work. The textfield is editable;
I did change:
public void addCellEditorListener(CellEditorListener l){
try {
SwingUtilities.invokeLater(
new Runnable() {
public void run() {ta.requestFocus();}
} catch (Exception e) {};
listenerList.add(CellEditorListener.class, l);
}This allows the first textfield to request focus and this seems to work. But when I highlight a cell, then start typing, the first character I type puts me into the editor, but it is lost. Example:
I type hello
and get ello in the cell. Then when I press enter the input is excepted and the selection goes to the next cell, but I cannot move the Highlight cursor at all, seems locked. The only way I can continue to the next cell is to use the mouse.
You said you had a cell editor working. Would you care to share as an example. This is killing me to get this to work properly.
Thanks again
Dave

How to use Jtable cell Editor

HI,
Here trying to populate the ImageIcon using JLabel in Jtable cell. For that I used DefaultCellRenderer. For implement the mouseListener to label I used the DefaultCellEditor. I am facing one problem here. After editing the label I selected the second row of the table, the first row image is not displaying. Can any one help on this issue?
public class LabelCellEditor extends DefaultCellEditor {
public LabelCellEditor(final JCheckBox checkBox) {
super(checkBox);
public Component getTableCellEditorComponent(final JTable table, final Object value,
final boolean isSelected, final int row, final int column) {
Color background = null;
background = ColorManager.SELECTED_ROW_BGCOLOR;
labelVal = (JLabel) value;
labelVal.setOpaque(true);
labelVal.setFont(FontManager.TABLE_DATA_FONT);
labelVal.setBackground(background);
labelPanel = new JPanel();
labelPanel.setOpaque(true);
labelPanel.setBackground(background);
labelPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
labelPanel.setBorder(new EmptyBorder(5, 0, 0, 0));
labelPanel.add(labelVal);
return this.labelPanel;
public Object getCellEditorValue() {
return this.labelPanel;
public class LabelCellRenderer extends DefaultTableCellRenderer {
public LabelCellRenderer(final int alignment) {
//setHorizontalAlignment(alignment);
this.align = alignment;
public Component getTableCellRendererComponent(final JTable table, final Object value,
final boolean isSelected, final boolean hasFocus, final int row, final int column) {
if (value != null) {
if (value instanceof JLabel) {
labelVal = (JLabel) value;
labelVal.setOpaque(true);
labelVal.setFont(FontManager.TABLE_DATA_FONT);
labelVal.setBackground(background);
labelVal.setHorizontalAlignment(this.align);
labelVal.setBorder(new EmptyBorder(0, LRPADD, 0, LRPADD));
JPanel panel = new JPanel();
panel.setOpaque(true);
panel.setBackground(background);
panel.setLayout(new FlowLayout(FlowLayout.LEFT));
panel.setBorder(new EmptyBorder(5, 0, 0, 0));
panel.add(labelVal);
return panel;
return this;
}

With more than 30 postings you should know by now how to use the "Code" tags when posting code so the code reatains its original formatting and is therefore more readable.
There is no need to create a custom editor, here is a simple example.

Jtable cell listening to mouse event source

Hi, I have a JTable with single cell selections enabled.
I can also get the mouseClicked event working, but the cure is worse than the illness, because every cell I click on will cause a jframe to pop-up.
Ideally only column 0 or 1 listens to the mouseClicked event.
Can someone please tell mehow to work that into the JTable cell (sorry for the tediously long code, its only a small part)
import javax.swing.JComponent;
...lots of import...
public class CCYTable extends JPanel
JTable newtable;
JLabel tableHeader;
public CCYFrame NewFrame;
private boolean DEBUG = false;
private int showInfoTimer = 10000; // info tip box will pop up for this period of time...
// if both column and row selection are enabled, then individual cell selection
// is also enabled.
private boolean ALLOW_COLUMN_SELECTION = true;
private boolean ALLOW_ROW_SELECTION = true;
private boolean clickForDetail = true; // click on cell to launch frame with detail
protected String[] colHeaderInfo =
    {"Name of Instrument, move mouse to instrument for general detail of service.",
      ...lots of text...
// get values from database, use an "invisible column" for unique key
// description, conditions etc from Oracle...
String LoC = "Letter of Credit";
   ...more variable...
public void init()
    //setSize(300,300);
    tableHeader = new JLabel("uy or Sell", JLabel.CENTER);
    setLayout(new BorderLayout());
    newtable = new JTable(new TableDefinition())
      //Put cell info here, from Oracle CellInfo varchar2
      public String getToolTipText (MouseEvent mevt)
        String info = null;
        java.awt.Point p = mevt.getPoint();
        int rowIndex = rowAtPoint(p);
        int colIndex = columnAtPoint(p);
        int realColIndex = convertColumnIndexToModel(colIndex);
        Object currentValue = getValueAt(rowIndex, colIndex);
        if (realColIndex == 0)
        { if (currentValue.equals(LoC))
          { info = "Click to read general description of our \"" + LoC + "\" service." ;
          ... ideally I would like to work the mouseClicked listener in here but...
        return info;
      } // end of JComponent's method getToolTipText
      //Put table header info
      protected JTableHeader createDefaultTableHeader()
        return new JTableHeader(columnModel)
          public String getToolTipText(MouseEvent mevt)
            String tip = null;
            java.awt.Point p = mevt.getPoint();
            int index = columnModel.getColumnIndexAtX(p.x);
            int realIndex = columnModel.getColumn(index).getModelIndex();
            return colHeaderInfo[realIndex];
    if (clickForDetail)
      newtable.addMouseListener(new MouseAdapter()
        public void mouseClicked(MouseEvent mevt)
          { // ...but JTable wants it like this...
            // launch a new pop-up to replace the tool tip box
            NewFrame = new CCYFrame("blabla");
    ToolTipManager.sharedInstance().setDismissDelay(showInfoTimer);
    newtable.setPreferredScrollableViewportSize(new Dimension(770, 350));
    JScrollPane scrollpane = new JScrollPane(newtable);
    initColumnSizes(newtable);
    enableCellSelection(newtable);
    add("North", tableHeader);
    add("Center", scrollpane);
   * For sizing columns. If all column heads are wider than the column-cells'
   * contents, then just use column.sizeWidthToFit().
private void initColumnSizes(JTable newtable)
    TableDefinition tblmodel = (TableDefinition)newtable.getModel();
    TableColumn column = null;
    Component comp = null;
    int headerWidth=0, cellWidth=0;
    Object[] longValues = tblmodel.longValues;
    TableCellRenderer headerRenderer = newtable.getTableHeader().getDefaultRenderer();
    TableCellRenderer rightRenderer = new RightRenderer();
    for (int i = 0; i < 7; i++)
      column = newtable.getColumnModel().getColumn(i);
      comp = headerRenderer.getTableCellRendererComponent(
                             null, column.getHeaderValue(),
                             false, false, 0, 0);
      headerWidth = comp.getPreferredSize().width;
      comp = newtable.getDefaultRenderer(tblmodel.getColumnClass(i)).
                      getTableCellRendererComponent(
                             newtable, longValues,
true, true, 0, i);
cellWidth = comp.getPreferredSize().width;
column.setPreferredWidth(Math.max(headerWidth, cellWidth));
TableColumn col2 = newtable.getColumnModel().getColumn(2);
col2.setCellRenderer( rightRenderer );
TableColumn col2Width = newtable.getColumnModel().getColumn(2);
col2Width.setPreferredWidth(2);
TableColumn col6 = newtable.getColumnModel().getColumn(6);
col6.setCellRenderer( rightRenderer );
TableColumn col6Width = newtable.getColumnModel().getColumn(6);
col6Width.setPreferredWidth(2);
}// end of method initColumnSizes
private void enableCellSelection(JTable newtable)
if (ALLOW_COLUMN_SELECTION)
if (ALLOW_ROW_SELECTION) {newtable.setCellSelectionEnabled(true);}
newtable.setColumnSelectionAllowed(true);
ListSelectionModel colSM = newtable.getColumnModel().getSelectionModel();
colSM.addListSelectionListener(new ListSelectionListener()
public void valueChanged(ListSelectionEvent lsevt)
if (lsevt.getValueIsAdjusting()) return;
ListSelectionModel lsm = (ListSelectionModel)lsevt.getSource();
if (lsm.isSelectionEmpty()) {}
else
//int selectedCol = lsm.getMinSelectionIndex();
//NewFrame = new CCYFrame("more blabla!");
}//end of method enableCellSelection
...a lot of code follows...
TIA :-)

Hi, thanks for the tip, but I get following compile-time error:
<identifier> expected
newtable.addMouseListener(new MouseAdapter()
.............................................^
package newtable does not exist
newtable.addMouseListener(new MouseAdapter()
...............^
2 errors
And here is how I've modified the code :
public class CCYTable extends JPanel
JTable newtable;
...lots of variables...
private boolean ALLOW_COLUMN_SELECTION = true;
private boolean ALLOW_ROW_SELECTION = true;
private boolean clickForDetail = true; // click on cell to launch frame with detail
protected String[] colHeaderInfo =
    {"Name of Instrument, move mouse to instrument for general detail of service.",
      ...lots of text for tooltipbox...
// get values from database, use an "invisible column" for unique key
// description, conditions etc from Oracle...
   ...lots more String variables...
public void init()
    //setSize(300,300);
    tableHeader = new JLabel("Bids and Offers", JLabel.CENTER);
    setLayout(new BorderLayout());
    newtable = new JTable(new TableDefinition())
      //Put cell info here, from Oracle CellInfo varchar2
      public String getToolTipText (MouseEvent mevt)
        String info = null;
        java.awt.Point p = mevt.getPoint();
        int rowIndex = rowAtPoint(p);
        int colIndex = columnAtPoint(p);
        int realColIndex = convertColumnIndexToModel(colIndex);
        Object currentValue = getValueAt(rowIndex, colIndex);
        if (realColIndex == 0)
        { if (currentValue.equals(LoC))
          { info = "Click to read general description of our \"" + LoC + "\" service." ;
        return info;
      } // end of JComponent's method getToolTipText
      newtable.addMouseListener(new MouseAdapter() // HELP: compiler throws error here !!!!!!!!
        public void mouseClicked(MouseEvent e)
          java.awt.Point p = mevt.getPoint();
          int rowIndex = rowAtPoint(p);
          int colIndex = columnAtPoint(p);
          int realColIndex = convertColumnIndexToModel(colIndex);
          Object currentValue = getValueAt(rowIndex, colIndex);
          if ((rowIndex == 0) and (colIndex == 0))
            // do stuff for this particular JTable cell ...
      //Put table header info
      protected JTableHeader createDefaultTableHeader()
        return new JTableHeader(columnModel)
          public String getToolTipText(MouseEvent mevt)
            String tip = null;
            java.awt.Point p = mevt.getPoint();
            int index = columnModel.getColumnIndexAtX(p.x);
            int realIndex = columnModel.getColumn(index).getModelIndex();
            return colHeaderInfo[realIndex];
    ToolTipManager.sharedInstance().setDismissDelay(showInfoTimer);
    newtable.setPreferredScrollableViewportSize(new Dimension(770, 350));
    JScrollPane scrollpane = new JScrollPane(newtable);
    initColumnSizes(newtable);
    enableCellSelection(newtable);
    add("North", tableHeader);
    add("Center", scrollpane);
}On the other hand, this code works after a fashion but it is not what is needed because it listens to every JTable cell :
public class CCYTable extends JPanel
JTable newtable;
...unbelievably more variable definitions, etc...
public void init()
    //setSize(300,300);
    tableHeader = new JLabel("Bids and Offers", JLabel.CENTER);
    setLayout(new BorderLayout());
    newtable = new JTable(new TableDefinition())
      //Put cell info here, from Oracle CellInfo varchar2
      public String getToolTipText (MouseEvent mevt)
        String info = null;
        java.awt.Point p = mevt.getPoint();
        int rowIndex = rowAtPoint(p);
        int colIndex = columnAtPoint(p);
        int realColIndex = convertColumnIndexToModel(colIndex);
        Object currentValue = getValueAt(rowIndex, colIndex);
        if (realColIndex == 0)
        { if (currentValue.equals(LoC))
          { info = "Click to read general description of our \"" + LoC + "\" service." ;
            if (rowIndex == 0) // HELP: compiles okay but won't specifically select rowIndex == 0 and colIndex == 0
            {this.addMouseListener(new clickListener(newtable, rowIndex, colIndex));
        return info;
      } // end of JComponent's method getToolTipText
     ... lots more code...
// ==============================
class clickListener extends MouseAdapter
    private JTable newtable;
    private int rowIndex;
    private int colIndex;
    public clickListener(JTable newtable, int rowIndex, int colIndex)
      this.newtable = newtable;
      this.rowIndex = rowIndex;
      this.colIndex = colIndex;
    public void mouseClicked(MouseEvent mevt)
      NewFrame = new CCYFrame("blablabla");
}// end of method clickListenerIdeally I should be able to use a selection criteria like this :
java.awt.Point p = mevt.getPoint();
rowIndex = rowAtPoint(p);
colIndex=colAtPoint(p);
if ((rowIndex == 0) && (colIndex == 0)) {//do something}but this is going to be a bad Chrissy for me?

Add event(keyListener) to JTable Cell default editor.

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