Me las arreglé para llegar tan lejos usandodesbordamiento de pila Por ejemplo, JTree muestra todas las unidades y carpetas del sistema, también quería mostrar todos los archivos correspondientes de la carpeta, obtuve todos los nombres de archivos en un bucle, necesité agregarlos, ¡ahí es donde me atasqué!

Por favor, dame instrucciones para agregar los archivos en la carpeta, ¡Gracias!

CÓDIGO:

public class viewGui extends JFrame {

    private FileSystemView fileSystemView;
    private Desktop desktop;
    private static final long serialVersionUID = 1083130296343096642L;
    public static JTree tree;
    private DefaultTreeModel treeModel;
    private JTable table;
    private ListSelectionListener listSelectionListener;

    private static final LayoutManager H = new GridLayout(1, 0);
    private static final LayoutManager V = new GridLayout(0, 1);

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    viewGui mainWindow = new viewGui();
                    mainWindow.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public viewGui() {

        fileSystemView = FileSystemView.getFileSystemView();
        desktop = Desktop.getDesktop();

        this.setTitle("Student Record Book");
        getContentPane().setLayout(H);
        getContentPane().setLayout(V);
        this.setPreferredSize(new Dimension(1200, 800));
        this.setExtendedState(NORMAL);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.getContentPane().setLayout(null);
        this.setResizable(true);

        DefaultMutableTreeNode root = new DefaultMutableTreeNode();
        treeModel = new DefaultTreeModel(root);

        TreeSelectionListener treeSelectionListener = new TreeSelectionListener() {
            public void valueChanged(TreeSelectionEvent tse){
                DefaultMutableTreeNode node = (DefaultMutableTreeNode)tse.getPath().getLastPathComponent();
                System.out.println("Node: "+node);
                showChildren(node);
            }
        };

        File[] roots = fileSystemView.getRoots();
        for (File fileSystemRoot : roots) {
            DefaultMutableTreeNode node = new DefaultMutableTreeNode(fileSystemRoot);
            root.add( node );
            File[] files = fileSystemView.getFiles(fileSystemRoot, true);
            for (File file : files) {
                if (file.isDirectory()) {
                    node.add(new DefaultMutableTreeNode(file));
                }
            }
        }

        tree = new JTree(treeModel);
        tree.setBounds(10, 11, 387, 740);
        tree.setRootVisible(false);
        tree.addTreeSelectionListener(treeSelectionListener);
        tree.expandRow(0);
        JScrollPane treeScroll = new JScrollPane(tree);

        tree.setVisibleRowCount(15);

        Dimension preferredSize = treeScroll.getPreferredSize();
        Dimension widePreferred = new Dimension(200,(int)preferredSize.getHeight());
        treeScroll.setPreferredSize( widePreferred );

        this.setLayout(H);
        this.validate();
        this.add(treeScroll, BorderLayout.WEST);
        this.pack();
        this.setLocationRelativeTo(null);
        this.setVisible(true);

        table = new JTable();
        table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        table.setAutoCreateRowSorter(true);
        table.setShowVerticalLines(false);

        listSelectionListener = new ListSelectionListener() {
            @Override
            public void valueChanged(ListSelectionEvent lse) {
                int row = table.getSelectionModel().getLeadSelectionIndex();
            }
        };

        table.getSelectionModel().addListSelectionListener(listSelectionListener);
        JScrollPane tableScroll = new JScrollPane(table);
        Dimension d = tableScroll.getPreferredSize();
        tableScroll.setPreferredSize(new Dimension((int)d.getWidth(), (int)d.getHeight()/2));
        getContentPane().add(tableScroll, BorderLayout.CENTER);


    }

    private void showChildren(final DefaultMutableTreeNode node) {
        tree.setEnabled(false);

        SwingWorker<Void, File> worker = new SwingWorker<Void, File>() {
            @Override
            public Void doInBackground() {
                File file = (File) node.getUserObject();
                if (file.isDirectory()) {
                    File[] files = fileSystemView.getFiles(file, true); //!!
                    if (node.isLeaf()) {
                        for (File child : files) {

                            System.out.println("child:"+child);
                            if (child.isDirectory()) {
                                publish(child);
                                //Need to add the file names under the folder
                            }
                        }
                    }
                }
                return null;
            }

            @Override
            protected void process(List<File> chunks) {
                for (File child : chunks) {
                    node.add(new DefaultMutableTreeNode(child));
                    if (child.isDirectory()){

                    }
                }
            }

            @Override
            protected void done() {
                tree.setEnabled(true);
            }
        };
        worker.execute();
    }
}