Connection à une BD avec java

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

public class ConnectionMySQL extends JFrame
	
	implements ActionListener {
	
	public static void main(String st[]) {
		CONNECTION_POOL_JDBC_TEST F = new CONNECTION_POOL_JDBC_TEST("kled");
// ajoutez une image comme icone en indiquant le chemin
		Image image = new ImageIcon("icone.ico").getImage();
		F.setIconImage(image);
		F.move(500, 500);
		F.show();
	}
	Connection con;
	private JTabbedPane jtab = new JTabbedPane();
	private String [] nom = new String[2];
    private JPanel p1;
	private JPanel p2;
	private JTextField req;
	private Object[][] resultat = new Object[100][4];
	public ResultSet rs;
	private Statement stm;
	private JTable table;
	private JButton valid, sortie;

	public ConnectionMySQL(String titre) {
		super(titre);
		p1 = new JPanel(new FlowLayout());
		valid = new JButton("Valider");
		valid.setActionCommand("1");
		valid.addActionListener(this);
		sortie = new JButton("Sortie");
        sortie.setActionCommand("3");
		sortie.addActionListener(this);

		req = new JTextField(8);
		req.setActionCommand("2");
		req.addActionListener(this);
		p1.add(new JLabel("Numéro:"));
		p1.add(req);
		p1.add(valid);
		p1.add(sortie);
		this.setSize(50, 30);
		getContentPane().setLayout(new BorderLayout());
		getContentPane().add(jtab);
        addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		try 
		{
		 Class.forName("org.gjt.mm.mysql.Driver");
		 // l'URL de la base doit être suivant cette forme khaled étant le nom de la base
         /*  A)*/ con =DriverManager.getConnection("jdbc:mysql:/127.0.0.1/khaled","","");
		          stm = con.createStatement();
		} 
		catch (Exception ex) 
		{
		System.out.println("exception :" + ex.toString() + " lors de la construction");
		}
		setSize(500, 200);
		pack();
		show();
 
	}
	public void actionPerformed(ActionEvent e) {

		if (e.getActionCommand()=="3") System.exit(0);
		
		if (e.getActionCommand() == "1"
			|| e.getActionCommand() == "2")
			 {

			try {
				if(req.getText()!=null)
				{ /* B) */ rs = stm.executeQuery("select num, nom from personne where num >= "+req.getText()+";");} 
						
				ResultSetMetaData rsm = rs.getMetaData();
				for (int i = 1; i <= rsm.getColumnCount(); i++)
				nom[i-1] = rsm.getColumnName(i);
				int h = 0;
				if(!rs.next()){System.out.println("Erreur");}
				else {
				while (rs.next()) {
					resultat[h][0] = rs.getString("num");
					resultat[h][1] = rs.getString("nom");
					h++;
				                  }
				}
					
			Object[][] tab = new Object[h][2];
				for (int j = 0; j < h; j++) {
					for (int k = 0; k < 2; k++)
						tab[j][k] = resultat[j][k];
											}
					
			table = new JTable(tab,nom);
			table.setForeground(Color.black);
			table.setGridColor(Color.BLACK);
			

           System.err.println("sqddddddddddddddddddddddddddddddddddd");
				
				jtab.addTab("Rep", new JScrollPane(table));
			
				// pack();
				show();

			} 
			catch (Exception ex) 
			{
				System.err.println("exception :" + ex.toString() + " lors de l'action");
			}
			
		}

	}

}