Creating file browser GUI using java swing tree

Question

Hi all,
I have some questions which i wish to clarify asap. I am working on a file browser project using java swing. I need to create 2 separate buttons. 1 of them will add a 'folder' while the other button will add a 'file' to the tree when the buttons are clicked once. The sample source code known as 'DynamicTreeDemo' which is found in the java website only has 1 add button which is not what i want. Please help if you know how the program should be written. Thx a lot.
Regards,

Answer 1

Sorry, don't know 'DynamicTreeDemo'import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import java.io.File;
public class Test extends JFrame {
  JTree jt = new JTree();
  DefaultTreeModel dtm = (DefaultTreeModel)jt.getModel();
  JButton newDir = new JButton("new Dir"), newFile = new JButton("new File");
  public Test() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container content = getContentPane();
    newDir.setEnabled(false);
    newFile.setEnabled(false);
    jt.setShowsRootHandles(true);
    content.add(new JScrollPane(jt), BorderLayout.CENTER);
    File c = new File("C:\\temp");
    DefaultMutableTreeNode root = new DefaultMutableTreeNode(c);
    dtm.setRoot(root);
    addChildren(root);
    jt.addTreeSelectionListener(new TreeSelectionListener() {
      public void valueChanged(TreeSelectionEvent tse) { select(tse) ; }
    JPanel jp = new JPanel();
    content.add(jp, BorderLayout.SOUTH);
    jp.add(newDir);
    jp.add(newFile);
    newDir.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        TreePath tp = jt.getSelectionPath();
        if (tp!=null) {
          DefaultMutableTreeNode dmtn = (DefaultMutableTreeNode)tp.getLastPathComponent();
          File newFile = new File((File)dmtn.getUserObject(),"foo");
          if (newFile.mkdir()) {
            dmtn.add(new DefaultMutableTreeNode(newFile));
            dtm.nodeStructureChanged(dmtn);
          } else System.out.println("No Dir");
    newFile.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        TreePath tp = jt.getSelectionPath();
        if (tp!=null) {
          DefaultMutableTreeNode dmtn = (DefaultMutableTreeNode)tp.getLastPathComponent();
          File newFile = new File((File)dmtn.getUserObject(),"foo.txt");
          try {
            if (newFile.createNewFile()) {
              dmtn.add(new DefaultMutableTreeNode(newFile));
              dtm.nodeStructureChanged(dmtn);
            } else System.out.println("No File");
          catch (java.io.IOException ioe) { ioe.printStackTrace(); }
    setSize(300, 300);
    setVisible(true);
  void select(TreeSelectionEvent tse) {
    TreePath tp = jt.getSelectionPath();
    newDir.setEnabled(false);
    newFile.setEnabled(false);
    if (tp!=null) {
      DefaultMutableTreeNode dmtn = (DefaultMutableTreeNode)tp.getLastPathComponent();
      File f = (File)dmtn.getUserObject();
      if (f.isDirectory()) {
        newDir.setEnabled(true);
        newFile.setEnabled(true);
  void addChildren(DefaultMutableTreeNode parent) {
    File parentFile = (File)parent.getUserObject();
    File[] children = parentFile.listFiles();
    for (int i=0; i<children.length; i++) {
      DefaultMutableTreeNode child = new DefaultMutableTreeNode(children);
parent.add(child);
if (children[i].isDirectory()) addChildren(child);
public static void main(String[] args) { new Test(); }