How to resize a cell in a JTAble

Hi everyone,
i have a question how can be done that a column of cells will have an specific size and that other column will be smaller or bigger than the other

Hi,
If you mean how to set the columns of your jtable to be of different widths, it can be done as follows:
 TableModel tm =table.getModel();
 int colcount = tm.getColumnCount();
 TableColumnModel tcm = table.getColumnModel();
 for(int s=0;s<colcount;s++) {
 tcm.getColumn(s).setPreferredWidth(150);
 tcm.getColumn(s).setMinWidth(150);
 }Just set the width you want based on the column no in the code above.
cheers,
vidyut
http://www.bonanzasoft.com

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How to make a cell in a JTable to be uneditable and handle events

I tried many things but failed,How do you make a cell in a JTable to be uneditable and also be able to handle events>Anyone who knows this please help.Thanx

Hello Klaas2001
You can add KeyListener ,MouseListener
Suppose you have set the value of cell using setValueAt()
table.addKeyListener(this);
public void keyTyped(KeyEvent src)
String val="";
int r= table.getEditingRow();
int c= table.getEditingColumn();
val=table.getValueAt(r,c).toString();
if (r!=-1 && c!=-1)
TableCellEditor tableCellEditor = table.getCellEditor(r, c);
tableCellEditor.stopCellEditing();
table.clearSelection();
table.setValueAt(val,r,c);
public void keyReleased(KeyEvent src)
public void keyPressed(KeyEvent src)
table.addMouseListener(this);
public void mouseClicked(MouseEvent e)
public void mouseEntered(MouseEvent e)
public void mouseExited(MouseEvent e)
public void mousePressed(MouseEvent e)
public void mouseReleased(MouseEvent e)
if(e.getClickCount()>=2)//Double Click
table.clearSelection();
int r= table.getEditingRow();
int c= table.getEditingColumn();
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r,c);
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You can remove keyListener and Mouse Listener whenever You want to edit
then add it later.
Regarding handling events implement javax.swing.event.TableModelListener
table.getModel().addTableModelListener(this);
public void tableChanged(javax.swing.event.TableModelEvent source)
TableModel tabMod = (TableModel)source.getSource();
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case TableModelEvent.UPDATE:
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How to do Multi Cell Selection in JTable

Dear Friends,
Any body know Multi cell selection in jtable......
Thanks

Try overriding the changeSelection(....) method of JTable.
public void changeSelection(int row, int column, boolean toggle, boolean extend)
if (d.after(currentDate)
super.changeSelection(row, column, toggle, extend);
}

How to restrict the cell selection in JTable based on cell contents...

Hi all,
I have some problem related to table cell selection.
I have a table that represets the calendar of some month and year.
I have the restriction that at one time only one cell could be selected.
Now i want the cell seletion like this,
I want only those dates to be selected if that date is after 'today'.
that is I want to restrict the selection of previous dates.
how can i do this.
I have overridden the table methods like this, still no use.
table = new JTable(model) {
setOpaque(false);
setSurrendersFocusOnKeystroke(false);
setRowHeight(20);
JTableHeader header = getTableHeader();
header.setOpaque(false);
getTableHeader().setReorderingAllowed(false);
setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
getTableHeader().setResizingAllowed(false);
setCellSelectionEnabled(true);
setFocusable(true);
setBackground(new Color(247, 251, 255));
setFont(newFont);
public boolean isCellEditable(int row, int col) {
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public boolean isCellSelected(int row, int col) {
int r = getSelectedRow();
int c = getSelectedColumn();
String val = (String)getValueAt(r,c);
Calendar cal = Calendar.getInstance();
cal.set(currentYear+1900, month,Integer.parseInt(val));
Date d = cal.getTime();
Date currentDate = new Date();
if (d.before(currentDate)) {
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} else {
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Someone please help...
-Soni

Try overriding the changeSelection(....) method of JTable.
public void changeSelection(int row, int column, boolean toggle, boolean extend)
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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)
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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;
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 public DragDropJTableCellContents() {
 setTitle("Drag and Drop JTable");
 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 getContentPane().add(createTable("JTable"), BorderLayout.CENTER);
 setSize(400, 300);
 setLocationRelativeTo(null);
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 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];
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 rowData[j] = tableId + " " + i + j;
 model.addRow(rowData);
 JTable table = new JTable(model);
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 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;
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 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 do I change the colour of text in a cell in a JTable?

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Ok, so if i create my own cell renderer do I set it as the default renderer for the whole table i.e.
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How to get the coordinate of a cell in the jtable?
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getCellRect(...);

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Hey All,
Platform: WinXP, Java 5.0.
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Great job camickr,
That did just what I wanted; you get the points for sure! I will say that It's surprising to me that Swing leaves so much work in calculation to be done for this simple idea.
Btw, I also want to mention here that there's another forum issue I raised and you responded to recently, and you never quite answered my question there:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=5160875
That's got 10 pts riding on it too, if you care to revisit the issue...
Thanks very much for the good work on the CellRenderer.

How to resize a cell in a JTAble

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