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Source code below from: Java Cookbook, Second Edition By Ian Darwin Published 14 June, 2004 Average rating       Powells     Alibris

import java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.io.*;
import java.util.*;

/**
 * Display a file system in a JTree view
 *
 * @version $Id: FileTree.java,v 1.9 2004/02/23 03:39:22 ian Exp $
 * @author Ian Darwin
 */
public class FileTree extends JPanel 
{ 
    /** Construct a FileTree */
    public FileTree(File dir) {
        setLayout(new BorderLayout());

        // Make a tree list with all the nodes, and make it a JTree
        JTree tree = new JTree(addNodes(null, dir));

        // Add a listener
        tree.addTreeSelectionListener(new TreeSelectionListener() {
            public void valueChanged(TreeSelectionEvent e) {
                DefaultMutableTreeNode node =
                    (DefaultMutableTreeNode)e.getPath().getLastPathComponent();
                System.out.println("You selected " + node);
            }
        });

        // Lastly, put the JTree into a JScrollPane.
        JScrollPane scrollpane = new JScrollPane();
        scrollpane.getViewport().add(tree);
        add(BorderLayout.CENTER, scrollpane);
    }

    /** Add nodes from under "dir" into curTop. Highly recursive. */
    DefaultMutableTreeNode addNodes(DefaultMutableTreeNode curTop, File dir) {
        String curPath = dir.getPath();
        DefaultMutableTreeNode curDir = new DefaultMutableTreeNode(curPath);
        if (curTop != null) {   // should only be null at root
            curTop.add(curDir);
        }
        Vector ol = new Vector();
        String[] tmp = dir.list();
        for (int i=0; i<tmp.length; i++)
            ol.addElement(tmp[i]);
        Collections.sort(ol, String.CASE_INSENSITIVE_ORDER);
        File f;
        Vector files = new Vector();
        // Make two passes, one for Dirs and one for Files. This is #1.
        for (int i=0; i<ol.size(); i++) {
            String thisObject = (String)ol.elementAt(i);
            String newPath;
            if (curPath.equals("."))
                newPath = thisObject;
            else
                newPath = curPath + File.separator + thisObject;
            if ((f = new File(newPath)).isDirectory())
                addNodes(curDir,  f);
            else
                files.addElement(thisObject);
        }
        // Pass two: for files.
        for (int fnum=0; fnum<files.size(); fnum++)
            curDir.add(new DefaultMutableTreeNode(files.elementAt(fnum)));
        return curDir;
    }

    public Dimension getMinimumSize() {
        return new Dimension(200, 400);
    }

    public Dimension getPreferredSize() {
        return new Dimension(200, 400);
    }

    /** Main: make a Frame, add a FileTree */
    public static void main(String[] av) {

        JFrame frame = new JFrame("FileTree");
        frame.setForeground(Color.black);
        frame.setBackground(Color.lightGray);
        Container cp = frame.getContentPane();

        if (av.length == 0) {
            cp.add(new FileTree(new File(".")));
        } else {
            cp.setLayout(new BoxLayout(cp, BoxLayout.X_AXIS));
            for (int i=0; i<av.length; i++)
                cp.add(new FileTree(new File(av[i])));
        }

        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}