Hi friend,

code to help in solving the problem :

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

public class JComboBoxExample extends JPanel {
JLabel jlbPicture;

public JComboBoxExample() {
String[] comboTypes = { "Numbers", "Alphabets", "Symbols"};

Vector<Object> vector = new Vector<Object>();
Connection con = null;
String url = "jdbc:mysql://localhost:3306/";;
String db = "userdetails";
String driver = "com.mysql.jdbc.Driver";
String user = "root";
String pass = "root";
try{
Class.forName(driver).newInstance();
con = DriverManager.getConnection(url+db, user, pass);
try{
Statement st = con.createStatement();
ResultSet res = st.executeQuery("SELECT * FROM userform");
while (res.next()) {
vector.add(res.getString("username"));


}
con.close();
}
catch (SQLException s){
System.out.println("SQL code does not execute.");
}
}
catch (Exception e){
e.printStackTrace();
}


JComboBox comboTypesList = new JComboBox(vector);
comboTypesList.setSelectedIndex(2);
comboTypesList.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JComboBox jcmbType = (JComboBox)e.getSource();
String cmbType = (String)jcmbType.getSelectedItem();
jlbPicture.setIcon(new ImageIcon(""+cmbType.trim().toLowerCase() + ".jpg"));
}
});

// Set up the picture
jlbPicture = new JLabel(new ImageIcon("" +
comboTypes[comboTypesList.getSelectedIndex()] +
".jpg"));
jlbPicture.setBorder(BorderFactory.createEmptyBorder(10,0,0,0));

jlbPicture.setPreferredSize(new Dimension(177, 122+10));

// Layout the demo
setLayout(new BorderLayout());
add(comboTypesList, BorderLayout.NORTH);
add(jlbPicture, BorderLayout.SOUTH);
setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
}

public static void main(String s[]) {
JFrame frame = new JFrame("JComboBox Usage Demo");

frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});

frame.setContentPane(new JComboBoxExample());
frame.pack();
frame.setVisible(true);
}
}


Thanks