Java JTree_6

import java.awt.BorderLayout;
import java.awt.Container;

import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.event.TreeExpansionEvent;
import javax.swing.event.TreeExpansionListener;
import javax.swing.event.TreeWillExpandListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.ExpandVetoException;
import javax.swing.tree.TreePath;

public class JTree_6 extends JFrame {

    /**
     *
     */
    private static final long serialVersionUID = -7110119222281494418L;

    public JTree_6() {
        // TODO Auto-generated constructor stub
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("倾城爱家");
        DefaultMutableTreeNode nodeA = new DefaultMutableTreeNode("经理办公室");
        DefaultMutableTreeNode nodeB = new DefaultMutableTreeNode("人事部");
        DefaultMutableTreeNode nodeC = new DefaultMutableTreeNode("技术部");
        DefaultMutableTreeNode nodeD = new DefaultMutableTreeNode("服务部");
        DefaultMutableTreeNode nodeE = new DefaultMutableTreeNode("推广部");

        DefaultMutableTreeNode nodeCA = new DefaultMutableTreeNode("网络维护部");
        DefaultMutableTreeNode nodeCB = new DefaultMutableTreeNode("应用开发部");

        DefaultMutableTreeNode nodeDA = new DefaultMutableTreeNode("网络服务部");
        DefaultMutableTreeNode nodeDB = new DefaultMutableTreeNode("内勤开发部");

        root.add(nodeA);
        root.add(nodeB);
        root.add(nodeC);
        root.add(nodeD);
        root.add(nodeE);
        nodeC.add(nodeCA);
        nodeC.add(nodeCB);
        nodeD.add(nodeDA);
        nodeD.add(nodeDB);

        final DefaultTreeModel treeModel = new DefaultTreeModel(root);
        final JTree tree = new JTree(treeModel);

        Container container = getContentPane();
        container.add(tree, BorderLayout.CENTER);

        tree.addTreeWillExpandListener(new TreeWillExpandListener() {

            @Override
            public void treeWillCollapse(TreeExpansionEvent event)
                    throws ExpandVetoException {
                // TODO Auto-generated method stub
                TreePath path = event.getPath();
                DefaultMutableTreeNode node = (DefaultMutableTreeNode) path
                        .getLastPathComponent();
                System.out.println("节点“" + node.getUserObject() + "”将被折叠！");
            }

            @Override
            public void treeWillExpand(TreeExpansionEvent event)
                    throws ExpandVetoException {
                // TODO Auto-generated method stub
                TreePath path = event.getPath();
                DefaultMutableTreeNode node = (DefaultMutableTreeNode) path
                        .getLastPathComponent();

                System.out.println("节点“" + node.getUserObject() + "”将被展开！");
            }

        });

        tree.addTreeExpansionListener(new TreeExpansionListener() {

            @Override
            public void treeCollapsed(TreeExpansionEvent event) {
                // TODO Auto-generated method stub
                TreePath path = event.getPath();
                DefaultMutableTreeNode node = (DefaultMutableTreeNode) path
                        .getLastPathComponent();
                System.out.println("节点“" + node.getUserObject() + "”已经被折叠！");
                System.out.println();
            }

            @Override
            public void treeExpande

补充：软件开发 , Java ,