Netbeans java with mysql

import java.sql.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.JOptionPane; *//*
SEE  BUTTON
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt)
{
try
{
Class.forName("java.sql.DriverManager");
Connection con = (Connection)
DriverManager.getConnection("jdbc:mysql://localhost:3306/telephone","root","firoz");
Statement stmt = (Statement) con.createStatement();
String query = "SELECT * from dir" + ";";
ResultSet rs = stmt.executeQuery(query);
while(rs.next())
{
int  a=Integer.parseInt(rs.getString("did"));
String b=rs.getString ("ph");
String c=rs.getString ("dname");
DefaultTableModel m=(DefaultTableModel)jTable1.getModel();
Object [] ob={a,c,b};
m.addRow(ob);
}
}
catch (Exception e)
{
JOptionPane.showMessageDialog (this, e.getMessage());
e.printStackTrace();
}    
    }