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import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
public class EditJTree
{
    JFrame jf;
    JTree tree;
    DefaultTreeModel model;
    DefaultMutableTreeNode root = new DefaultMutableTreeNode("中国");
    DefaultMutableTreeNode guangdong = new DefaultMutableTreeNode("广东");
    DefaultMutableTreeNode guangxi = new DefaultMutableTreeNode("广西");
    DefaultMutableTreeNode foshan = new DefaultMutableTreeNode("佛山");
    DefaultMutableTreeNode shantou = new DefaultMutableTreeNode("汕头");
    DefaultMutableTreeNode guilin = new DefaultMutableTreeNode("桂林");
    DefaultMutableTreeNode nanning = new DefaultMutableTreeNode("南宁");
    TreePath movePath;
    JButton addSiblingButton = new JButton("添加兄弟节点");
    JButton addChildButton = new JButton("添加子节点");
    JButton deleteButton = new JButton("删除节点");
    JButton editButton = new JButton("编辑当前节点");
    public void init()
    {
        guangdong.add(foshan);
        guangdong.add(shantou);
        guangxi.add(guilin);
        guangxi.add(nanning);
        root.add(guangdong);
        root.add(guangxi);
        jf = new JFrame("可编辑节点的树");
        tree = new JTree(root);
        model = (DefaultTreeModel)tree.getModel();
        tree.setEditable(true);
        MouseListener ml = new MouseAdapter()
        {
            public void mousePressed(MouseEvent e)
            {
                TreePath tp = tree.getPathForLocation(
                    e.getX() , e.getY());
                if (tp != null)
                {
                    movePath = tp;
                }
            }
            public void mouseReleased(MouseEvent e)
            {
                TreePath tp = tree.getPathForLocation(
                    e.getX(), e.getY());
                if (tp != null && movePath != null)
                {
                    if (movePath.isDescendant(tp) && movePath != tp)
                    {
                        JOptionPane.showMessageDialog(jf,
                            "目标节点是被移动节点的子节点，无法移动！",
                            "非法操作", JOptionPane.ERROR_MESSAGE );
                        return;
                    }
                    else if (movePath != tp)
                    {
                        ((DefaultMutableTreeNode)tp.getLastPathComponent())
                            .add((DefaultMutableTreeNode)movePath
                            .getLastPathComponent());
                        movePath = null;
                        tree.updateUI();
                    }
                }
            }
        };
        tree.addMouseListener(ml);
        JPanel panel = new JPanel();
        addSiblingButton.addActionListener(event -> {
            DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)
                tree.getLastSelectedPathComponent();
            if (selectedNode == null) return;
            DefaultMutableTreeNode parent = (DefaultMutableTreeNode)
                selectedNode.getParent();
            if (parent == null) return;
            DefaultMutableTreeNode newNode = new
                DefaultMutableTreeNode("新节点");
            int selectedIndex = parent.getIndex(selectedNode);
            model.insertNodeInto(newNode, parent, selectedIndex + 1);
            TreeNode[] nodes = model.getPathToRoot(newNode);
            TreePath path = new TreePath(nodes);
            tree.scrollPathToVisible(path);
        });
        panel.add(addSiblingButton);
        addChildButton.addActionListener(event -> {
            DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)
                tree.getLastSelectedPathComponent();
            if (selectedNode == null) return;
            DefaultMutableTreeNode newNode = new
                DefaultMutableTreeNode("新节点");
            selectedNode.add(newNode);
            TreeNode[] nodes = model.getPathToRoot(newNode);
            TreePath path = new TreePath(nodes);
            tree.scrollPathToVisible(path);
            tree.updateUI();
        });
        panel.add(addChildButton);
        deleteButton.addActionListener(event ->  {
            DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)
                tree.getLastSelectedPathComponent();
            if (selectedNode != null && selectedNode.getParent() != null)
            {
                model.removeNodeFromParent(selectedNode);
            }
        });
        panel.add(deleteButton);
        editButton.addActionListener(event -> {
            TreePath selectedPath = tree.getSelectionPath();
            if (selectedPath != null)
            {
                tree.startEditingAtPath(selectedPath);
            }
        });
        panel.add(editButton);
        jf.add(new JScrollPane(tree));
        jf.add(panel , BorderLayout.SOUTH);
        jf.pack();
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.setVisible(true);
    }
    public static void main(String[] args)
    {
        new EditJTree().init();
    }
}
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