How to manipulate jtable cell?

Hi experts,
I created a jtable with a BC4J related to the jtable.
I do not know how to update a cell and how to insert a new row in the jtable.
Would someone please tell me where I can find the document about manipulating a jtable?

Have a look at the source code of JUNavigationBar. In that class, look for JUActionBinding(_buttons[BUTTON_FIRST] , bind, JUActionBinding.ACTION_FIRST, false);As you can see you will need the JUActionBinding class.

Similar Messages

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.

How to make Jtable cell empty onClick?

Hi All,
I have one requirement where I need to make the Jtable cell value empty on click or tab event. So, User does not have to do back space and delete whole string to edit that cell.
Any idea?
Thanks in advance.

Hi camickr,
Thanks for that reply. It did not work for me but Here is the thing.
My requirement was : Client does not want to do back space in order do edit cell value when that cell clicked.
I tried find the solution that, i can make that cell area as selected when it is clicked. my problem is solved. So, I tried to use Table select all editor.
But here is what i found ......
If I want that cell area selected, I need to do one more click(3 clicks at the same time) to select the value of that cell & I can put my new value without doing back space(stupid client requirement)
Thanks for your help

How to access jtable cells in multiple tabs?

Hi,
in my program when I push a button 3 tabs are created. And all these tabs have a table in it. What I want to do is that When I push other button I want to access all these tables and cells. and get the cell values. How can I get the value of one cell in the jtable when I have multiple tabs?
thanks in advance.

This is my main window
public class AuditClient extends javax.swing.JFrame {
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
createCheckList();
public void createCheckList() {
CheckList.createCheckList(CheckListChildPane);
private javax.swing.JTabbedPane CheckListChildPane;
private javax.swing.JPanel CheckListParentPanel;
And This is the CheckList.java : This code create tabs and tables in it. (from xml file).
public class CheckList extends JPanel implements ActionListener{
JTable table;
public CheckList(Object[][] TheData) {
MyTableModel model = new MyTableModel();
model.setData(TheData);
table = new JTable(model);
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane);
class MyTableModel extends AbstractTableModel {
public String[] columnNames = null;
public Object[][] data = null;
public final Object[] longValues = null;
public void setColumnNames(String[] cols) {
this.columnNames=cols;
public void setData(Object[][] datas) {
this.data=datas;
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();
public static void createCheckList(JTabbedPane CheckListChildPane) {
//creates tabs and tables in it
I want to access the tables (which I created in CheckList java) from my main window. I want to get the cell values of these tables
thanks

How to set JTable cell editable/non-editable dynamically using NetBean?

I am using NetBean 6.5, create a database desktop application, I using the persistence entity manager to bind my JTable with database.
Now, I want to set practicular cells which are enable and disable, I tried to create my own table model and override the isEditable() method, which it seems didn't work. I guessed the problem is the persistence connection between my Table and database.
How can I solve it? Any example? I just googled the web and can't find example which use netbean combined with database. I know that a single JTable would work when creating your own model.
thx.

I know what coding i did, Yes u r right but im new to GUI programming only,
That's why i posted it to forums, I gone through the Control Flow Statements link what u have given.
U didnt get my question at all.
Again the problem im facing is the table is already displayed with 2nd column uneditable.
When some Action done on table, i need to make 2nd column editable at run time.
Thanks if u provide me the solution instead of deciding what type of programmer im.

How to set JTable cells to uneditable

I was trying to set the cells in my Jtable to uneditable.
I overrided the isCellEditable method. Here is what I did. But the
cells remain editable. Any ideas?
private class MyTableModel extends DefaultTableModel
public MyTableModel(Vector vectRow,Vector vecColumn)
super(vecVector,vecColumn);
public boolean isCellEditable(int row, int col)
if (col >= 0) {
return false;
}

Just Use:
public boolean isCellEditable(int r, int c) { return false; }

How to wrap JTable cell like EXCEL sheet??

Hi All,
I am using JTable and i want to wrap cell of that table like excel sheet whtn text length is more .
i m using jdk 1.4.2 & jre 1.4
can any body help me on that??
== gavin

Search this forum on "wrap text in table cell" I got a ton of hits.
Cheers
DB

How to edit jtable programmatically?

id like to know how to edit jtable cell programmatically.
thanks!

override
getTableCellEditorComponent in customized
TableCellEditor.Hi,
hmm ... if that's that, what he want to know? - I guess, he wants to know how to change values of the JTable by program.
Every JTable has an underlying TableDataModel that holds the values of the tablecells. You can retrieve this model by the getModel()-method of the JTable.
To get a value from the model use method getValueAt(row,column) of the model.
To set a value in the model use method setValueAt(object,row,column) of the model.
See the TableModel-interface-Documentation for other methods.
greetings Marsian

How to outline selected cells during drag and drop in the jtable

Hi,
I have spent a lot of time to find out how to outline selected cells during drag in the jtable, but I did not find the answer.
Can anybody give me a tip, where to read more about this problem or even better, give an example...
I have the following situation:
1.Table has 10 rows and 10 columns
2.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION) and setCellSelectionEnabled(true)
3.user select 5 cells in 4th row (for example cell45,cell46,cell47,cell48 and cell49)
4.user starts dragging. During dragging an outline should be drawn. Outline should be a rectangular with width of 5 cells and height of one cell. Outline should move according to the mouse position.
5.rectangular disappears when dropped
Regards,
Primoz

In "createTransferable" you can create a drag image
which you can paint in "dragOver" and clear in "drop" method of DropTarget :
package dnd;
* DragDropJTableCellContents.java
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
public class DragDropJTableCellContents extends JFrame {
    public DragDropJTableCellContents() {
        setTitle("Drag and Drop JTable");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        getContentPane().add(createTable("JTable"), BorderLayout.CENTER);
        setSize(400, 300);
        setLocationRelativeTo(null);
    private JPanel createTable(String tableId) {
        DefaultTableModel model = new DefaultTableModel();
        for (int i = 0; i < 10; i++) {
            model.addColumn("Column "+i);
        for (int i = 0; i < 10; i++) {
            String[] rowData = new String[10];
            for (int j = 0; j < 10; j++) {
                rowData[j] = tableId + " " + i + j;
            model.addRow(rowData);
        JTable table = new JTable(model);
        table.getTableHeader().setReorderingAllowed(false);
        table.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
        table.setCellSelectionEnabled(true);
        JScrollPane scrollPane = new JScrollPane(table);
        table.setDragEnabled(true);
        TableTransferHandler th = new TableTransferHandler();
        table.setTransferHandler(th);
        table.setDropTarget(new TableDropTarget(th));
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        JPanel panel = new JPanel(new BorderLayout());
        panel.add(scrollPane);
        panel.setBorder(BorderFactory.createTitledBorder(tableId));
        return panel;
    public static void main(String[] args) {
        new DragDropJTableCellContents().setVisible(true);
    abstract class StringTransferHandler extends TransferHandler {
        public int dropAction;
        protected abstract String exportString(JComponent c);
        protected abstract void importString(JComponent c, String str);
        @Override
        protected Transferable createTransferable(JComponent c) {
            return new StringSelection(exportString(c));
        @Override
        public int getSourceActions(JComponent c) {
            return COPY;
        @Override
        public boolean importData(JComponent c, Transferable t) {
            if (canImport(c, t.getTransferDataFlavors())) {
                try {
                    String str = (String) t.getTransferData(DataFlavor.stringFlavor);
                    importString(c, str);
                    return true;
                } catch (UnsupportedFlavorException ufe) {
                } catch (IOException ioe) {
            return false;
        @Override
        public boolean canImport(JComponent c, DataFlavor[] flavors) {
            for (int ndx = 0; ndx < flavors.length; ndx++) {
                if (DataFlavor.stringFlavor.equals(flavors[ndx])) {
                    return true;
            return false;
    class TableTransferHandler extends StringTransferHandler {
        private int dragRow;
        private int[] dragColumns;
        private BufferedImage[] image;
        private int row;
        private int[] columns;
        public JTable target;
        @Override
        protected Transferable createTransferable(JComponent c) {
            JTable table = (JTable) c;
            dragRow = table.getSelectedRow();
            dragColumns = table.getSelectedColumns();
            createDragImage(table);
            return new StringSelection(exportString(c));
        protected String exportString(JComponent c) {
            JTable table = (JTable) c;
            row = table.getSelectedRow();
            columns = table.getSelectedColumns();
            StringBuffer buff = new StringBuffer();
            for (int j = 0; j < columns.length; j++) {
                Object val = table.getValueAt(row, columns[j]);
                buff.append(val == null ? "" : val.toString());
                if (j != columns.length - 1) {
                    buff.append(",");
            return buff.toString();
        protected void importString(JComponent c, String str) {
            target = (JTable) c;
            DefaultTableModel model = (DefaultTableModel) target.getModel();
            String[] values = str.split("\n");
            int colCount = target.getSelectedColumn();
            int max = target.getColumnCount();
            for (int ndx = 0; ndx < values.length; ndx++) {
                String[] data = values[ndx].split(",");
                for (int i = 0; i < data.length; i++) {
                    String string = data;
if(colCount < max){
model.setValueAt(string, target.getSelectedRow(), colCount);
colCount++;
public BufferedImage[] getDragImage() {
return image;
private void createDragImage(JTable table) {
if (dragColumns != null) {
try {
image = new BufferedImage[dragColumns.length];
for (int i = 0; i < dragColumns.length; i++) {
Rectangle cellBounds = table.getCellRect(dragRow, i, true);
TableCellRenderer r = table.getCellRenderer(dragRow, i);
DefaultTableModel m = (DefaultTableModel) table.getModel();
JComponent lbl = (JComponent) r.getTableCellRendererComponent(table,
table.getValueAt(dragRow, dragColumns[i]), false, false, dragRow, i);
lbl.setBounds(cellBounds);
BufferedImage img = new BufferedImage(lbl.getWidth(), lbl.getHeight(),
BufferedImage.TYPE_INT_ARGB_PRE);
Graphics2D graphics = img.createGraphics();
graphics.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1f));
lbl.setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY));
lbl.paint(graphics);
graphics.dispose();
image[i] = img;
} catch (RuntimeException re) {
class TableDropTarget extends DropTarget {
private Insets autoscrollInsets = new Insets(20, 20, 20, 20);
private Rectangle rect2D = new Rectangle();
private TableTransferHandler handler;
public TableDropTarget(TableTransferHandler h) {
super();
this.handler = h;
@Override
public void dragOver(DropTargetDragEvent dtde) {
handler.dropAction = dtde.getDropAction();
JTable table = (JTable) dtde.getDropTargetContext().getComponent();
Point location = dtde.getLocation();
int row = table.rowAtPoint(location);
int column = table.columnAtPoint(location);
table.changeSelection(row, column, false, false);
paintImage(table, location);
autoscroll(table, location);
super.dragOver(dtde);
public void dragExit(DropTargetDragEvent dtde) {
clearImage((JTable) dtde.getDropTargetContext().getComponent());
super.dragExit(dtde);
@Override
public void drop(DropTargetDropEvent dtde) {
Transferable data = dtde.getTransferable();
JTable table = (JTable) dtde.getDropTargetContext().getComponent();
clearImage(table);
handler.importData(table, data);
super.drop(dtde);
private final void paintImage(JTable table, Point location) {
Point pt = new Point(location);
BufferedImage[] image = handler.getDragImage();
if (image != null) {
table.paintImmediately(rect2D.getBounds());
rect2D.setLocation(pt.x - 15, pt.y - 15);
int wRect2D = 0;
int hRect2D = 0;
for (int i = 0; i < image.length; i++) {
table.getGraphics().drawImage(image[i], pt.x - 15, pt.y - 15, table);
pt.x += image[i].getWidth();
if (hRect2D < image[i].getHeight()) {
hRect2D = image[i].getHeight();
wRect2D += image[i].getWidth();
rect2D.setSize(wRect2D, hRect2D);
private final void clearImage(JTable table) {
table.paintImmediately(rect2D.getBounds());
private Insets getAutoscrollInsets() {
return autoscrollInsets;
private void autoscroll(JTable table, Point cursorLocation) {
Insets insets = getAutoscrollInsets();
Rectangle outer = table.getVisibleRect();
Rectangle inner = new Rectangle(outer.x + insets.left,
outer.y + insets.top,
outer.width - (insets.left + insets.right),
outer.height - (insets.top + insets.bottom));
if (!inner.contains(cursorLocation)) {
Rectangle scrollRect = new Rectangle(cursorLocation.x - insets.left,
cursorLocation.y - insets.top,
insets.left + insets.right,
insets.top + insets.bottom);
table.scrollRectToVisible(scrollRect);
Edited by: Andre_Uhres on Nov 18, 2007 10:03 PM

How to write an element in a JTable Cell

Probably it's a stupid question but I have this problem:
I have a the necessity to build a JTable in which, when I edit a cell and I push a keyboard button, a new Frame opens to edit the content of the cell.
But the problem is how to write something in the JTable cell, before setting its model. Because, I know, setCellAT() method of JTree inserts the value in the model and not in the table view. And repainting doesn't function!
What to do??
Thanks

Hi there
Depending on your table model you should normally change the "cell value" of the tablemodel.
This could look like:
JTable table = new JTable();
TableModel model = table.getModel();
int rowIndex = 0, columnIndex = 0;
model.setValueAt("This is a test", rowIndex, columnIndex);
The tablemodel should then fire an event to the view (i.e. JTable) and the table should be updated.
Hope this helps you

How to select rows in the inner JTable rendered in an outer JTable cell

I have wrriten the following code for creating cell specific renderer - JTable rendered in a cell of a JTable.
table=new JTable(data,columnNames)
public TableCellRenderer getCellRenderer(int row, int column)
if ((row == 0) && (column == 0))
return new ColorRenderer();
else if((row == 1) && (column == 0))
return new ColorRenderer1();
else
return super.getCellRenderer(row, column);
ColorRenderer and ColorRenderer1 are two inner classes, which implement TableCellRenderer to draw inner JTable on the outer JTable cell, having 2 rows and 1 column each.
Now what is happening the above code keeps executing continously, that is the classes are being initialised continously, inner JTables are rendered (drawn) continously, and this makes the application slow after some time. It throws java.lang.OutOfMemoryException.
WHY IS IT SO??? I can't understand where's the bug..
Any advice please???
Moreover i want selections in inner tables and not on outer table, how can this be possible.
I am working on this since a long time but have not yet found a way out...

With your help i have overcome the problem of continous repeatition.
The major problem which I am facing is, in selecting rows in the inner rendered JTables.
I have added listener on outer JTable which select rows on the outer JTable, hence the complete inner JTable which being treated as a row, gets selected.
The thing is i need to select the rows of inner rendered JTables,not the outer JTable.
How to go about it??
I have even added listener to inner rendered JTables, but only first row of every table gets selected.
Please help....
Thanks in advance.

How to display images in a Jtable cell-Urgent

Hay all,
Can anybody tell me that can we display images to JTable' cell,If yes the how do we do that(with some code snippet)? Its very urgent .Plz reply as soon as possible.

Here is an example
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
class SimpleTableExample extends JFrame
     private     JPanel topPanel;
     private     JTable table;
     private     JScrollPane scrollPane;
     public SimpleTableExample()
          setTitle( "Table With Image" );
          setSize( 300, 200 );
          setBackground( Color.gray );
          topPanel = new JPanel();
          topPanel.setLayout( new BorderLayout() );
          getContentPane().add( topPanel );
          // Create columns names
          String columnNames[] = { "Col1", "Col2", "Col3" };
          // Create some data
          Object data[][] =
               { (ImageIcon) new ImageIcon("User.Gif"), (String) "100", (String)"101" },
               { (String)"102", (String)"103", (String)"104" },
               { (String)"105", (String)"106", (String)"107" },
               { (String)"108", (String)"109", (String)"110" },
          // Create a new table instance
DefaultTableModel model = new DefaultTableModel(data, columnNames);
          JTable table = new JTable( model )
               public Class getColumnClass(int column)
                    return getValueAt(0, column).getClass();
          };          // Add the table to a scrolling pane
          scrollPane = new JScrollPane( table );
          topPanel.add( scrollPane, BorderLayout.CENTER );
     public static void main( String args[] )
          SimpleTableExample mainFrame     = new SimpleTableExample();
          mainFrame.setVisible( true );
}

How to display cusomized custom tooltip(jwindow) in jtable cell position

Hi,
i am trying to display custom tooltip for jtable cell. i created custom tooltip(jwindow) and on mouseover of jtable cell i am trying to display the custom tooltip.
But it is not display the position of jtable cell. How to display the exact position of jtable cell
please help me on this.

Did you read the posting directly below yours which was also about a custom tool tip?
JScrollableToolTip is buggy
The code presented there shows the tool tip in the proper location.
For more help create a [url http://sscce.org]SSCCE, that demonstrates the incorrect behaviour.
Don't forget to read the "Welcome to the new home" posting at the start of the forum to learn how to use the "code tags" so posted code is formatted and readable.

How to make JPanel as JTable Cell Editor (Urgent help needed)

Hi!
I want to make JPanel (with a JTextField, 3 JLabels and 1 JTextArea) as cell editor for one column. Can somebody help me on this?
Does anybody have any sample code? I will greatly appreciate ur help.
Thanks,
Snehal

Okie. In "How to use JTables" page found in the JAVA website (there is a link from the JTable section of the JAVA API documentation), there is a sample code for a sample color chooser. What this does is, adds a button with its action listener set to pop up a color chooser window. In this, rendering is still through a JLabel.
This example would be of good help to you. Plus, this example gives me a feeling that what u ask is possible.

How to automatically highlight / bold words in a JTable cell?

how do i do it?
i have an Object called Data (where toString() is the same as getDataName()).
and i want the JTable to either highlight or bold specific words (using the bold HTML tags) that are present in a SortedSet.
i do not want the dataName to be changed by directly manipulating the Object because the Data Objects were taken from the DB and i need the Objects and the records to be synchronised, and because the words in the SortedSet itself are subject to changes (add/edit/remove).
thanks.

Edit: removed
db
Cross posted
http://www.java-forums.org/awt-swing/47138-how-automatically-highlight-bold-words-jtable-cell.html
Edited by: Darryl Burke

How to manipulate jtable cell?

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