Start to edit nodes in JTree in Java

  //w  w w .  j ava2s  . com

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"));

    rootNode.add(forums);
    rootNode.add(articles);
    rootNode.add(examples);

    m_tree.setEditable(true);
    m_tree.setSelectionRow(0);

    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
            .getLastSelectedPathComponent();
        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);
          m_tree.scrollPathToVisible(path);
          m_tree.setSelectionPath(path);
          m_tree.startEditingAtPath(path);
        }
      }
    });
    panel.add(addButton);
    getContentPane().add(panel, BorderLayout.SOUTH);
    setSize(300, 400);
    setVisible(true);
  }
  public static void main(String[] arg) {
    new Main();
  }
}