Adding editable nodes to JTree : Tree « Swing JFC « Java

Adding editable nodes to JTree

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;

public class Main extends JFrame {
  DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("J");

  DefaultTreeModel model = new DefaultTreeModel(rootNode);

  JTree m_tree = new JTree(model);

  JButton addButton;

  public Main() {
    DefaultMutableTreeNode forums = new DefaultMutableTreeNode("F");
    forums.add(new DefaultMutableTreeNode("T"));
    DefaultMutableTreeNode articles = new DefaultMutableTreeNode("A");
    articles.add(new DefaultMutableTreeNode("1"));
    DefaultMutableTreeNode examples = new DefaultMutableTreeNode("E");
    examples.add(new DefaultMutableTreeNode("2"));



    JScrollPane scrollPane = new JScrollPane(m_tree);
    getContentPane().add(scrollPane, BorderLayout.CENTER);

    JPanel panel = new JPanel();
    addButton = new JButton("Add Node");
    addButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent event) {
        DefaultMutableTreeNode selNode = (DefaultMutableTreeNode) m_tree
        if (selNode != null) {
          DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("New Node");
          model.insertNodeInto(newNode, selNode, selNode.getChildCount());
          TreeNode[] nodes = model.getPathToRoot(newNode);
          TreePath path = new TreePath(nodes);
    getContentPane().add(panel, BorderLayout.SOUTH);
    setSize(300, 400);
  public static void main(String[] arg) {
    new Main();


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