Hi Friend,

Try the following code:

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

public class SwingFrame{
public static void main(String[] args) throws Exception{
SwingFrame sf=new SwingFrame();
}
public SwingFrame(){
JFrame f = new JFrame("Frame in Java Swing");
f.getContentPane().setLayout(null);
JLabel lbl1 = new JLabel("Select Course");
final JComboBox jc=new JComboBox();
jc.addItem("Select");
jc.addItem("MCA");
jc.addItem("MBA");
jc.addItem("BE");
jc.addItem("BTech");
jc.addItem("Others");
JLabel lbl2 = new JLabel("Duration");
final JTextField jt1=new JTextField(15);
JLabel lbl3 = new JLabel("Fees");
final JTextField jt2=new JTextField(15);
lbl1.setBounds(50,50,100,20);
jc.setBounds(170,50,100,20);
lbl2.setBounds(50,80,70,20);
jt1.setBounds(170,80,100,20);
lbl3.setBounds(50,110,70,20);
jt2.setBounds(170,110,100,20);

jc.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
ItemSelectable is = (ItemSelectable)e.getSource();
String st= selectedString(is);
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con =DriverManager.getConnection("jdbc:odbc:access","","");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select * from course where name='"+st+"'");
int duration=0;
int fees=0;
while(rs.next()){
duration=rs.getInt("duration");
fees=rs.getInt("fees");
}
jt1.setText(Integer.toString(duration));
jt2.setText(Integer.toString(fees));
}
catch(Exception ex){}
}
});
f.add(lbl1);
f.add(lbl2);
f.add(lbl3);
f.add(jt1);
f.add(jt2);
f.add(jc);
f.setSize(1000,1000);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
static private String selectedString(ItemSelectable is) {
Object selected[] = is.getSelectedObjects();
return ((selected.length == 0) ? "null" : (String)selected[0]);
}
}

Thanks