How to accessing files in os and display as tree

Question

i have worked lot to access the files in os and display them as tree structure but could not suceed can any one help me

Answer 1

* Light Development Java Library
* Copyright (C) 2003, 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
package com.lightdev.lib.ui;
import javax.swing.JTree;
import javax.swing.tree.TreePath;
import java.io.File;
public class JFileTree extends JTree {
  public JFileTree(File root) {
    super();
    FileTreeModel model = new FileTreeModel(root);
    this.setModel(model);
  public JFileTree() {
    this(new File(System.getProperty("user.home")));
  private String parsePath(TreePath treePath) {
    int pathSize = treePath.getPathCount();
    String path = null;
    for (int i = 0; i < pathSize; i++) {
      if (path == null) {
        path = treePath.getPathComponent(i).toString();
      else {
        path += File.separatorChar + treePath.getPathComponent(i).toString();
    return path;
  public String[] getSelectedUrls() {
    int treepathAmount = getSelectionCount();
    TreePath[] treePaths = getSelectionPaths();
    String[] stringSet = new String[treepathAmount];
    if (treepathAmount != 0) {
      for (int i = 0; i < treepathAmount; i++) {
        stringSet[i] = parsePath(treePaths);
return stringSet;
return null;
* Light Development Java Library
* Copyright (C) 2003, 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
package com.lightdev.lib.ui;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import javax.swing.event.TreeModelListener;
import java.io.File;
import com.lightdev.lib.io.CustomFile;
public class FileTreeModel implements TreeModel {
  public FileTreeModel(File root) {
    this.root = root;
  public Object getRoot() {
    return root;
  public boolean isLeaf(Object node) {
    return ( (File) node).isFile();
  public int getChildCount(Object parent) {
    File[] children = ( (File) parent).listFiles();
    if (children == null)return 0;
    return children.length;
  public Object getChild(Object parent, int index) {
    File[] children = ( (File) parent).listFiles();
    if ( (children == null) || (index >= children.length)) {
      return null;
    return new CustomFile( (File) parent, children[index].getName());
  public int getIndexOfChild(Object parent, Object child) {
    File[] children = ( (File) parent).listFiles();
    if (children == null)return -1;
    String childname = ( (File) child).getName();
    for (int i = 0; i < children.length; i++) {
      if (childname.equals(children)) {
return i;
return -1;
* this tree model is not intended to be editable which is why
* this method is not implemented
* @param path TreePath
* @param newvalue Object
public void valueForPathChanged(TreePath path, Object newvalue) {}
* this tree model is not editable and does not fire events which is why
* this method is not implemented
* @param l TreeModelListener
public void addTreeModelListener(TreeModelListener l) {
* this tree model is not editable and does not fire events which is why
* this method is not implemented
* @param l TreeModelListener
public void removeTreeModelListener(TreeModelListener l) {}
* reference to this tree model's root node (a File)
protected File root;