How to use : Java GUI ComboBox (JComboBox) from Database

Vector Items = new Vector();
while((rec!=null) && (rec.next()))
{		
	Items.add(rec.getString("CustomerID") + " - " + rec.getString("Name"));
}
DefaultComboBoxModel model = new DefaultComboBoxModel(Items);
JComboBox comboBox = new JComboBox(model);

JComboBox comboBox = new JComboBox(model);
comboBox.addActionListener(new ActionListener() {
	public void actionPerformed(ActionEvent e) {
		lblResult.setText(comboBox.getSelectedItem().toString());
	}
});

CREATE TABLE `customer` (
  `CustomerID` varchar(4) NOT NULL,
  `Name` varchar(50) NOT NULL,
  `Email` varchar(50) NOT NULL,
  `CountryCode` varchar(2) NOT NULL,
  `Budget` double NOT NULL,
  `Used` double NOT NULL,
  PRIMARY KEY  (`CustomerID`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

-- 
-- dump ตาราง `customer`
-- 

INSERT INTO `customer` VALUES ('C001', 'Win Weerachai', '[email protected]', 'TH', 1000000, 600000);
INSERT INTO `customer` VALUES ('C002', 'John  Smith', '[email protected]', 'UK', 2000000, 800000);
INSERT INTO `customer` VALUES ('C003', 'Jame Born', '[email protected]', 'US', 3000000, 600000);
INSERT INTO `customer` VALUES ('C004', 'Chalee Angel', '[email protected]', 'US', 4000000, 100000);

package com.java.myapp;

import java.awt.EventQueue;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Vector;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JOptionPane;
import javax.swing.JFrame;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JLabel;
import javax.swing.SwingConstants;

public class MyForm extends JFrame {

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				MyForm frame = new MyForm();
				frame.setVisible(true);
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public MyForm() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 409, 243);
		setTitle("ThaiCreate.Com Java GUI Tutorial");
		getContentPane().setLayout(null);
		
		// Combobox
	    Vector Items = new Vector();
	    
	    Connection connect =  ConnectDB();
		Statement s = null;
	
		try {

			s = connect.createStatement();
			
			String sql = "SELECT * FROM  customer ORDER BY CustomerID ASC";
			
			ResultSet rec = s.executeQuery(sql);
			int row = 0;
			while((rec!=null) && (rec.next()))
            {		
				Items.add(rec.getString("CustomerID") + " - " + rec.getString("Name"));
            }

			rec.close();

		} catch (Exception e) {
			// TODO Auto-generated catch block
			JOptionPane.showMessageDialog(null, e.getMessage());
			e.printStackTrace();
		}
		
		try {
			if(s != null) {
				s.close();
				connect.close();
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	    
		// Label Result
		final JLabel lblResult = new JLabel("Result");
		lblResult.setHorizontalAlignment(SwingConstants.CENTER);
		lblResult.setBounds(62, 154, 272, 14);
		getContentPane().add(lblResult);
		
	    // Combobox
	    DefaultComboBoxModel model = new DefaultComboBoxModel(Items);
	    final JComboBox comboBox = new JComboBox(model);
	    comboBox.addActionListener(new ActionListener() {
	    	public void actionPerformed(ActionEvent e) {
	    		lblResult.setText(comboBox.getSelectedItem().toString());
	    	}
	    });
		comboBox.setBounds(113, 58, 167, 20);
		getContentPane().add(comboBox);	
		
	}
	
	// Connection
	private Connection ConnectDB() {
		try {
			Class.forName("com.mysql.jdbc.Driver");
			return  DriverManager.getConnection("jdbc:mysql://localhost/mydatabase" +
					"?user=root&password=root");
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
	
}