Java Program for illustrating Swing

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

/*<applet code="Jswing" width=400 height=400>
</applet>*/

public class Jswing extends JApplet
{
JTree tree;
JTextField jtf;
public void init()
{
Container contentPane=getContentPane();
contentPane.setLayout(new BorderLayout());
DefaultMutableTreeNode clg=new DefaultMutableTreeNode("SRNM");

DefaultMutableTreeNode slf=new DefaultMutableTreeNode("SELF");
clg.add(slf);

DefaultMutableTreeNode ug=new DefaultMutableTreeNode("UG");
slf.add(ug);

DefaultMutableTreeNode pg=new DefaultMutableTreeNode("PG");
slg.add(pg);

DefaultMutableTreeNode max=new DefaultMutableTreeNode("B.Sc Maths");
ug.add(max);

DefaultMutableTreeNode phy=new DefaultMutableTreeNode("B.Sc Physics");
ug.add(phy);

DefaultMutableTreeNode eng=new DefaultMutableTreeNode("B.A English");
ug.add(eng);

DefaultMutableTreeNode com=new DefaultMutableTreeNode("B.Com");
ug.add(com);

DefaultMutableTreeNode pcs=new DefaultMutableTreeNode("M.Sc CS");
pg.add(pcs);

DefaultMutableTreeNode pca=new DefaultMutableTreeNode("M.C.A");
pg.add(pca);

DefaultMutableTreeNode reg=new DefaultMutableTreeNode("Regular");
clg.add(reg);

DefaultMutableTreeNode ug1=new DefaultMutableTreeNode("UG");
reg.add(ug1);

DefaultMutableTreeNode cs=new DefaultMutableTreeNode("B.C.A");
reg.add(cs);

DefaultMutableTreeNode ca=new DefaultMutableTreeNode("B.Com CA");
reg.add(ca);

DefaultMutableTreeNode pg1=new DefaultMutableTreeNode("PG");
reg.add(pg1);

DefaultMutableTreeNode pch=new DefaultMutableTreeNode("M.Sc Chemistry");
pg1.add(pch);

DefaultMutableTreeNode pcom=new DefaultMutableTreeNode("M.Com");
pg1.add(pcom);

tree=new JTree(clg);
int v=ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
int h=ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
JScrollPane jsp=new JScrollPane(tree,v,h);
contentPane.add(jsp,BorderLayout.CENTER);
jtf=new JTextField("",20);
contentPane.add(jtf,BorderLayout.SOUTH);
tree.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent me)
{
doMouseClicked(me);
}
});
}
void doMouseClicked(MouseEvent me)
{
TreePath tp=tree.getPathForLocation(me.getX(),me.getY());
if(tp!=null)
jtf.setText(tp.toString());
else
jtf.setText("");
}
}