JTREE with CheckBox Option

Question

Hi All,
Can somebody help in how to add a CheckBox in JTREE node concept.
Please let me if sites are there for the same.
Rgds
Sudhama

Answer 1

* The CheckedTree is an extension to JTree with the additional functioanlity that
* the nodes can be checked or unchecked using a checkbox.
* <p>
* Each node in the tree contains a checkbox.
* @author anoopkc
public class CheckedTree extends JTree {
    private CustomRenderer renderer = null;
    private List<TreePath> selectedNodes = null;
     * Initialises the checked tree
    public CheckedTree() {
        this.selectedNodes = new ArrayList<TreePath>();
        this.setTreeProperties();
     * Sets the properties of the tree
    private void setTreeProperties() {
        this.renderer = new CustomRenderer(this);
        super.setCellRenderer(renderer);
        super.getSelectionModel().setSelectionMode(4);
        super.addMouseListener(new MouseAdapter() {
             * Handles the click on the tree nodes.
             * When mouse is clicked on a node, the node is added in the
             * list of selected rows in the tree.
             * @param e
            public void mousePressed(MouseEvent e) {
                TreePath path = getPathForLocation(e.getX(), e.getY());
                if (path != null) {
                    addSelectedNode(path);
                    updateUI();
     * This method adds the selected path in to the list of selected nodes.
     * If the path is already exists, it is removed from the list.
     * @param path
    private void addSelectedNode(TreePath path) {
        if (selectedNodes.indexOf(path) == -1) {
            selectedNodes.add(path);
        } else {
            selectedNodes.remove(path);
     * This method checks whether a given tree path is selected or not
     * @param path
     * @return true if selected
    public boolean isSelected(TreePath path) {
        if (this.selectedNodes.indexOf(path) == -1) {
            return false;
        return true;
     * Returns the list of selected columns
     * @return list of selected columns
    public List<TreePath> getSeelctedNodes() {
        return selectedNodes;
* This class creates the renderer for the checked tree
* @author anoopkc
class CustomRenderer extends JPanel implements TreeCellRenderer {
    private JLabel label = null;
    private JCheckBox checkBox = null;
    private CheckedTree tree = null;
     * Initialises the renderer
     * @param checkedTree
    public CustomRenderer(CheckedTree checkedTree) {
        this.tree = checkedTree;
        this.prepareComponent();
     * Prepares the component
    private void prepareComponent() {
        creatComponent();
        this.packComponents();
     * Creates the component
    private void creatComponent() {
        this.label = new JLabel();
        this.label.setPreferredSize(new Dimension(100, 21));
        this.label.setForeground(UIManager.getColor("Tree.textForeground"));
        this.label.setOpaque(true);
        this.checkBox = new JCheckBox();
        this.checkBox.setBackground(UIManager.getColor("Tree.textBackground"));
     * Packs the components
    private void packComponents() {
        setLayout(new GridBagLayout());
        setBackground(Color.WHITE);
        GridBagConstraints gbcCheckBox = new GridBagConstraints();
        gbcCheckBox.gridx = 0;
        GridBagConstraints gbcLabel = new GridBagConstraints();
        gbcLabel.gridx = 0;
        gbcLabel.gridx = 1;
        gbcLabel.weightx = 1;
        gbcLabel.fill = GridBagConstraints.HORIZONTAL;
        add(this.checkBox, gbcCheckBox);
        add(this.label, gbcLabel);
     * Returns the tree cell renderer component
     * @param tree
     * @param value
     * @param selected
     * @param expanded
     * @param leaf
     * @param row
     * @param hasFocus
     * @return component
    public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
        TreePath path = tree.getPathForRow(row);
        label.setText(value.toString());
        label.setIcon(new ImageIcon("icons/smiley.gif"));
        if (selected) {
            label.setBackground(new Color(220, 220, 200));
        } else {
            label.setBackground(Color.WHITE);
        if (this.tree.isSelected(path)) {
            this.checkBox.setSelected(true);
        } else {
            checkBox.setSelected(false);
        return this;
}