ejemplo de Grabar, Modificar y Eliminar con Base de Datos

package javasql;
import java.sql.*;
import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JComboBox;
import javax.swing.JTextArea;
import javax.swing.JButton;
import java.awt.Rectangle;
import java.awt.Dimension;
public class MantProductos extends JFrame {
private JPanel jContentPane = null;
private JLabel jLabel = null;
private JLabel jLabel1 = null;
private JLabel jLabel2 = null;
private JLabel jLabel3 = null;
private JLabel jLabel4 = null;
private JLabel jLabel5 = null;
private JTextField jTextField = null;
private JComboBox jComboBox = null;
private JTextField [...]