Checkbox inside jtable

Question

I have the following sample code in which i wanted to include checkbox in the 3rd column. How to insert?
import java.awt.Dimension;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
public class simpletable extends JPanel
     public simpletable()
          String[] columnNames={"FName","LName","Vegetarian"};
          Object[][] datas={ {"Harry","Potter",new Boolean(true)},{"William","Shakespeare",new Boolean(true)}};
          final JTable table=new JTable(datas, columnNames);
          table.setPreferredScrollableViewportSize(new Dimension(400, 50));
          JScrollPane scrollPane = new JScrollPane(table);
          add(scrollPane);
          int numRows = table.getRowCount();
          int numCols = table.getColumnCount();
          javax.swing.table.TableModel model = table.getModel();
          System.out.println("Value of data: ");
          for (int i = 0; i < numRows; i++)
          System.out.print(" row " + i + ":");
          for (int j = 0; j < numCols; j++)
          System.out.print(" " + model.getValueAt(i, j));
               private static void createAndShowGUI()
               JFrame.setDefaultLookAndFeelDecorated(true);
               JFrame frame = new JFrame("SimpleTableDemo");
               frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               simpletable newContentPane = new simpletable();
               newContentPane.setOpaque(true); // content panes must be opaque
               frame.setContentPane(newContentPane);
               frame.pack();
               frame.setVisible(true);
          public static void main(String[] args)
          javax.swing.SwingUtilities.invokeLater(new Runnable()
                    public void run()
                         createAndShowGUI();
}

Answer 1

Hi,
If u want to place a check box in a table u need to place the rederer and editor of the check box.
pls find the editor and redorer for the check box.
public class CheckBoxCellEditor extends JCheckBox implements TableCellEditor {
protected ChangeEvent changeEvent = new ChangeEvent(this);
protected EventListenerList listenerList = new EventListenerList();
boolean selected = false;
boolean cellEnabled = true;
* Constructs a new <code>CheckBoxCellEditor</code> object.
public CheckBoxCellEditor() {
super();
this.setSize(10, 10);
addItemListener(new ItemListener() {
* Invoked when item event occurs.
* @param event <code> ItemEvent</code>
public void itemStateChanged(ItemEvent event) {
fireEditingStopped();
* Registers the <code>CellEditorListener</code> to listeners list
* @param l a <code>CellEditorListener</code>
public void addCellEditorListener(CellEditorListener l) {
listenerList.add(CellEditorListener.class, l);
* To cancel the Cell Editing invoked all the actions with this cell will be cancelled
public void cancelCellEditing() {
fireEditingCanceled();
* Returns the cell editor value as <code>Object</code> this will be called when stops the
* cell editing
* @return Object
public Object getCellEditorValue() {
return new Boolean(this.isSelected());
* Returns the Editor Component to be painted on the table for the given row and column with
* given value.
* <p>
* in the method we need to set the value and state of component then return component itself so
* that it can be painted as it is on the table.
* @param table <code>JTable</code> is the component where this editor need to be painted.
* @param value <code>Object</code> is the value for the EditorComponent.
* @param isSelected boolean
* @param row int
* @param column int
* @return <code>Component</code> is the editor component to be painted on the table.
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected,
int row, int column) {
selected = isSelected;
this.requestFocus();
if (table.isCellEditable(row, column)) {
this.setEnabled(true);
else {
this.setEnabled(false);
if (value.equals(new Boolean(true))) {
this.setSelected(true);
else {
this.setSelected(false);
return this;
* sets the state of the cell.
* @param enabled boolean
public void setCellEnabled(boolean enabled) {
cellEnabled = enabled;
* Determines whether this editor component is Editable or not if the return value is true then
* it will behave as editable component other wise it can not allow to edit
* @param anEvent <code>EventObject</code>
* @return boolean
public boolean isCellEditable(EventObject anEvent) {
return cellEnabled;
* Remove the <code>CellEditorListener</code> from the listeners list.
* @param l <code>CellEditorListener</code>
public void removeCellEditorListener(CellEditorListener l) {
listenerList.remove(CellEditorListener.class, l);
* Returns whether cell should be selectble or not when some event occurs.
* @param anEvent <code>EventObject</code>
* @return boolean
public boolean shouldSelectCell(EventObject anEvent) {
return true;
* Stops the cell Editing invoked when the focus lost from this editorcomponent and puts the
* values into model
* @return boolean
public boolean stopCellEditing() {
fireEditingStopped();
return true;
* Invoked when stops the cell editing by removing thefocus from the editor component.
public void fireEditingStopped() {
CellEditorListener listener;
Object[] listeners = listenerList.getListenerList();
for (int i = 0; i < listeners.length; i++) {
if (listeners[i] == CellEditorListener.class) {
listener = (CellEditorListener) listeners[i + 1];
listener.editingStopped(changeEvent);
* Invoked when stops the cell editing when call cancell cell edit method on perticular cell it
* will removes all editing values
public void fireEditingCanceled() {
CellEditorListener listener;
Object[] listeners = listenerList.getListenerList();
for (int i = 0; i < listeners.length; i++) {
if (listeners[i] == CellEditorListener.class) {
listener = (CellEditorListener) listeners[i + 1];
listener.editingCanceled(changeEvent);
and rederer is
public class CheckBoxCellRendrer extends JCheckBox implements TableCellRenderer {
public boolean cellEnabled = true;
* Constructs a new <code>CheckBoxCellRendrer</code> object.
public CheckBoxCellRendrer() {
super();
this.setEnabled(true);
* Prepares and Returns the Button Renderer component for the table cell to be renderered this
* will set the value and state of the component then paints on table cell
* @param table <code>JTable</code> component where the renderer to be painted
* @param value <code>Object</code> value for the renderer
* @param isSelected boolean
* @param hasFocus boolean
* @param row int
* @param column int
* @return <code>Component</code>
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,
boolean hasFocus, int row, int column) {
if (table.isCellEditable(row, column)) {
this.setEnabled(true);
else {
this.setEnabled(false);
if (value != null && value.equals(new Boolean(true))) {
this.setSelected(true);
else {
this.setSelected(false);
return this;
* sets the state of the cell
* @param enabled boolean
public void setCellEnabled(boolean enabled) {
cellEnabled = enabled;
* determines whether this cell is editable or not
* @param anEvent <code>EventObject</code>
* @return boolean
public boolean isCellEditable(EventObject anEvent) {
return cellEnabled;
* determines whether this cell is editable or not
* @param anEvent <code>EventObject</code>
* @return boolean
public boolean isCellEnabled(EventObject anEvent) {
return cellEnabled;
u need to use the below code to place these in tabe
TableColumn column1 = ((TableColumnModel) ttable.getColumnModel()).getColumn(1);
column1.setPreferredWidth(25);
CheckBoxCellEditor editor1 = new CheckBoxCellEditor();
column1.setCellEditor(editor1);
CheckBoxCellRendrer renderer1 = new CheckBoxCellRendrer();
column1.setCellRenderer(renderer1);
this may help u.
regards
jeevan