如何获取包括JTree子行在内的选定行

import javax.swing.*;
import javax.swing.tree.*;

public class JTreeSelectionExample {
    public static void main(String[] args) {
        // 创建一个JFrame窗口
        JFrame frame = new JFrame("JTree Selection Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // 创建一个JTree
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
        DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Node 1");
        DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Node 2");
        DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("Node 3");
        DefaultMutableTreeNode node4 = new DefaultMutableTreeNode("Node 4");
        DefaultMutableTreeNode node5 = new DefaultMutableTreeNode("Node 5");
        DefaultMutableTreeNode node6 = new DefaultMutableTreeNode("Node 6");
        DefaultMutableTreeNode node7 = new DefaultMutableTreeNode("Node 7");
        DefaultMutableTreeNode node8 = new DefaultMutableTreeNode("Node 8");
        DefaultMutableTreeNode node9 = new DefaultMutableTreeNode("Node 9");
        root.add(node1);
        root.add(node2);
        root.add(node3);
        node1.add(node4);
        node1.add(node5);
        node2.add(node6);
        node2.add(node7);
        node3.add(node8);
        node3.add(node9);

        JTree tree = new JTree(root);
        tree.getSelectionModel().setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);

        // 获取选定的行，包括子行
        TreePath[] selectionPaths = tree.getSelectionPaths();
        if (selectionPaths != null) {
            for (TreePath path : selectionPaths) {
                DefaultMutableTreeNode lastNode = (DefaultMutableTreeNode) path.getLastPathComponent();
                Enumeration<TreeNode> descendants = lastNode.depthFirstEnumeration();
                while (descendants.hasMoreElements()) {
                    DefaultMutableTreeNode descendantNode = (DefaultMutableTreeNode) descendants.nextElement();
                    TreePath descendantPath = new TreePath(descendantNode.getPath());
                    tree.addSelectionPath(descendantPath);
                }
            }
        }

        // 将JTree添加到JFrame窗口中
        frame.add(new JScrollPane(tree));
        frame.setSize(300, 400);
        frame.setVisible(true);
    }
}