从JComboBox中选择JTree节点，反之亦然

import javax.swing.*;
import javax.swing.event.*;

public class ComboBoxTreeExample {
    private JComboBox<String> comboBox;
    private JTree tree;

    public ComboBoxTreeExample() {
        JFrame frame = new JFrame("ComboBox and Tree Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        DefaultComboBoxModel<String> comboBoxModel = new DefaultComboBoxModel<>();
        comboBoxModel.addElement("Node 1");
        comboBoxModel.addElement("Node 2");
        comboBoxModel.addElement("Node 3");
        
        comboBox = new JComboBox<>(comboBoxModel);
        
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
        DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Node 1");
        DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Node 2");
        DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("Node 3");
        root.add(node1);
        root.add(node2);
        root.add(node3);
        
        tree = new JTree(root);
        tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
        tree.addTreeSelectionListener(new TreeSelectionListener() {
            @Override
            public void valueChanged(TreeSelectionEvent e) {
                DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
                if (selectedNode != null) {
                    String nodeName = selectedNode.getUserObject().toString();
                    comboBox.setSelectedItem(nodeName);
                }
            }
        });
        
        comboBox.addActionListener(new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String selectedNode = comboBox.getSelectedItem().toString();
                selectTreeNode(selectedNode);
            }
        });
        
        frame.add(comboBox, BorderLayout.NORTH);
        frame.add(new JScrollPane(tree), BorderLayout.CENTER);
        
        frame.pack();
        frame.setVisible(true);
    }

    private void selectTreeNode(String nodeName) {
        DefaultMutableTreeNode root = (DefaultMutableTreeNode) tree.getModel().getRoot();
        TreeNode node = findNodeByName(root, nodeName);
        if (node != null) {
            TreePath path = new TreePath(((DefaultTreeModel) tree.getModel()).getPathToRoot(node));
            tree.setSelectionPath(path);
            tree.scrollPathToVisible(path);
        }
    }

    private DefaultMutableTreeNode findNodeByName(DefaultMutableTreeNode node, String nodeName) {
        if (node.getUserObject().toString().equals(nodeName)) {
            return node;
        }
        for (int i = 0; i < node.getChildCount(); i++) {
            DefaultMutableTreeNode child = (DefaultMutableTreeNode) node.getChildAt(i);
            DefaultMutableTreeNode foundNode = findNodeByName(child, nodeName);
            if (foundNode != null) {
                return foundNode;
            }
        }
        return null;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new ComboBoxTreeExample();
            }
        });
    }
}