public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Ventas.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Ventas.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Ventas.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Ventas.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Ventas().setVisible(true);                
                Limpiar.setIcon(new ImageIcon(this.getClass().getResource("/Imagen/Clean.png")));
                Eliminar.setIcon(new ImageIcon(this.getClass().getResource("/Imagen/Del.png")));
                Acept.setIcon(new ImageIcon(this.getClass().getResource("/Imagen/Ok.png")));  
                jTable1.setModel(new DefaultTableModel(
                        new Object[][]{},new String [] {
                            "Id", "Nombre", "Marca", "Cantidad", "Precio","Total"
                        }
                ){
                    boolean[] canEdit = new boolean [] {
                        false, false, false, false, false
                    };
                    public boolean isCellEditable(int rowIndex, int columnIndex) {
                        return canEdit [columnIndex];
                    }
                });
            }
        });
    }