Swing Tree

package  GUI;

import  java.awt.Dimension;

import  javax.swing.JFrame;
import  javax.swing.JScrollPane;
import  javax.swing.JTree;
import  javax.swing.event.TreeSelectionEvent;
import  javax.swing.event.TreeSelectionListener;
import  javax.swing.tree.DefaultMutableTreeNode;
import  javax.swing.tree.TreeSelectionModel;

public   class  TreeTest  extends  JFrame  {

    public TreeTest() {
        DefaultMutableTreeNode Program = new DefaultMutableTreeNode("Program");
        DefaultMutableTreeNode Office = new DefaultMutableTreeNode("Office");
        DefaultMutableTreeNode Word = new DefaultMutableTreeNode("Word");
        DefaultMutableTreeNode PowerPoint = new DefaultMutableTreeNode("PowerPoint");
        DefaultMutableTreeNode Access = new DefaultMutableTreeNode("Access");
        DefaultMutableTreeNode Excel = new DefaultMutableTreeNode("Excel");
        DefaultMutableTreeNode Java = new DefaultMutableTreeNode("Java");
        DefaultMutableTreeNode j2se = new DefaultMutableTreeNode("j2se");
        DefaultMutableTreeNode j2ee = new DefaultMutableTreeNode("j2ee");
        DefaultMutableTreeNode j2me = new DefaultMutableTreeNode("j2me");
        DefaultMutableTreeNode Application = new DefaultMutableTreeNode("Application");
        DefaultMutableTreeNode Dreamweaver = new DefaultMutableTreeNode("Dreamweaver");
        DefaultMutableTreeNode PotoShop = new DefaultMutableTreeNode("PotoShop");
        DefaultMutableTreeNode VisualStudio = new DefaultMutableTreeNode("VisualStudio");
        
        Office.add(Word);
        Office.add(PowerPoint);
        Office.add(Access);
        Office.add(Excel);
        Java.add(j2se);
        Java.add(j2ee);
        Java.add(j2me);
        Application.add(Dreamweaver);
        Application.add(PotoShop);
        Application.add(VisualStudio);
        Program.add(Office);
        Program.add(Java);
        Program.add(Application);
        
        JTree jtree = new JTree(Program);
        jtree.getSelectionModel().setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
        jtree.setRowHeight(20);

        jtree.addTreeSelectionListener(new TreeSelectionListener() {
            public void valueChanged(TreeSelectionEvent e) {
                JTree tree = (JTree)e.getSource();
                System.out.println(e.getPath());
            }
        });

        
        JScrollPane jscrollpane = new JScrollPane(jtree);
        
        this.add(jscrollpane);
    }
    
    public static void main(String[] args) {
        TreeTest tt = new TreeTest();
        tt.setBounds(100, 200, 300, 400);
        tt.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        tt.setVisible(true);
        
    }
    
}