I want to make only one node draggable in the tree. How?

Question

I want to make only one node draggable in the tree. How?
when we have only
tree.setDragEnable(true)which makes draggable the entire nodes in the tree.
Thanks -

Answer 1

Hi Andrea
Just to clarify things up: is this what you want?
package treeDnD;
* DragJustOneNode.java
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.io.*;
import javax.swing.*;
import javax.swing.tree.*;
public class DragJustOneNode extends JFrame {
    private JTree tree;
    private DefaultTreeModel model;
    private DefaultMutableTreeNode root;
    public DragJustOneNode() {
        super("Only child 1 is draggable!");
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setSize(400,300);
        setLocationRelativeTo(null);
        tree = new JTree();
        tree.setDragEnabled(true);
        getContentPane().add(new JScrollPane(tree), BorderLayout.CENTER);
        tree.setTransferHandler(new TreeTransferHandler());
        root = new DefaultMutableTreeNode(new NodeData(0, "root"));
        root.add(new DefaultMutableTreeNode(new NodeData(1, "child 1")));
        root.add(new DefaultMutableTreeNode(new NodeData(2, "child 2")));
        root.add(new DefaultMutableTreeNode(new NodeData(3, "child 3")));
        root.add(new DefaultMutableTreeNode(new NodeData(4, "child 4")));
        model = new DefaultTreeModel(root);
        tree.setModel(model);
    public static void main(final String args[]) {new DragJustOneNode().setVisible(true);}
class NodeData{
    private int id;
    private String data;
    public NodeData(final int id, final String data){
        this.id = id;
        this.data = data;
    public int getId() {return id;}
    public void setId(final int id) {this.id = id;}
    public String getData() {return data;}
    public void setData(final String data) {this.data = data;}
    public String toString() {return data;}
class TreeTransferable implements Transferable{
    private NodeData nodeData;
    public TreeTransferable(NodeData nodeData){
        this.nodeData = nodeData;
    public DataFlavor[] getTransferDataFlavors() {
        return new DataFlavor[]{DataFlavor.stringFlavor};
    public boolean isDataFlavorSupported(DataFlavor flavor) {
        return true;
    public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
        return nodeData;
class TreeTransferHandler extends TransferHandler{
    private DefaultMutableTreeNode sourceNode, targetNode;
    public boolean canImport(final JComponent comp, final DataFlavor[] transferFlavors) {
        NodeData nodeData = (NodeData) (sourceNode).getUserObject();
        if(nodeData.getId() == 1) return true;
        return false;
    protected Transferable createTransferable(final JComponent c) {
        JTree tree = ((JTree)c);
        sourceNode = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
        return new TreeTransferable((NodeData) sourceNode.getUserObject());
    public int getSourceActions(final JComponent c) {return DnDConstants.ACTION_MOVE;}
    public boolean importData(final JComponent comp, final Transferable t) {
        JTree tree = ((JTree)comp);
        DefaultTreeModel model = (DefaultTreeModel)tree.getModel();
        targetNode = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
        DefaultMutableTreeNode parent = (DefaultMutableTreeNode)targetNode.getParent();
        if(parent == null) return false;
        model.removeNodeFromParent(sourceNode);
        model.insertNodeInto(sourceNode, parent, parent.getIndex(targetNode));
        tree.setSelectionPath(new TreePath(model.getPathToRoot(sourceNode)));
        return true;
}