Hi Friend,

Try the following code:

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

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("Branch");
final JComboBox jc=new JComboBox();
JButton b=new JButton("Insert");
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con =DriverManager.getConnection("jdbc:odbc:access","","");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select name from course");

jc.addItem("Select");
while(rs.next()){
jc.addItem(rs.getString("name"));
}
}
catch(Exception e){}
lbl1.setBounds(100,120,70,20);

jc.setBounds(170,120,100,20);
b.setBounds(170,150,100,20);
f.add(lbl1);

f.add(b);
f.add(jc);
f.setSize(1000,1000);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

b.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){

String st= jc.getSelectedItem().toString();
System.out.println(st);
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con =DriverManager.getConnection("jdbc:odbc:access","","");
Statement stmt=con.createStatement();
int i=stmt.executeUpdate("insert into Student(Course) values('"+st+"')");
}
catch(Exception ex){
System.out.println(ex);
}
}
});
}
}

Thanks