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(); } }
