Configurar descuento (Nicolás)

package Proyecto;

import java.awt.EventQueue;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.UIManager;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class DlgConfigurarDescuento extends JDialog implements ActionListener {

    private static final long serialVersionUID = 1L;
    private JLabel lblNewLabel;
    private JLabel lblA;
    private JLabel lblA_2;
    private JLabel lblMsDe;
    private JTextField txtDesc1;
    private JTextField txtDesc2;
    private JTextField txtDesc3;
    private JTextField txtDesc4;
    private JLabel lblNewLabel_1;
    private JLabel lblNewLabel_2;
    private JLabel lblNewLabel_3;
    private JLabel lblNewLabel_4;
    private JButton btnCancelar;
    private JButton btnAceptar;

    public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Throwable e) {
            e.printStackTrace();
        }
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    DlgConfigurarDescuento dialog = new DlgConfigurarDescuento();
                    dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
                    dialog.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public DlgConfigurarDescuento() {
        setTitle("Configurar porcentajes de descuento");
        setResizable(false);
        setModal(true);
        setBounds(100, 100, 444, 149);
        getContentPane().setLayout(null);

        lblNewLabel = new JLabel("1 a 5 unidades");
        lblNewLabel.setBounds(10, 11, 70, 14);
        getContentPane().add(lblNewLabel);

        lblA = new JLabel("6 a 10 unidades");
        lblA.setBounds(10, 36, 76, 14);
        getContentPane().add(lblA);

        lblA_2 = new JLabel("11 a 15 unidades");
        lblA_2.setBounds(10, 61, 82, 14);
        getContentPane().add(lblA_2);

        lblMsDe = new JLabel("M\u00E1s de 15 unidades");
        lblMsDe.setBounds(10, 86, 95, 14);
        getContentPane().add(lblMsDe);

        txtDesc1 = new JTextField();
        txtDesc1.setBounds(124, 8, 86, 20);
        getContentPane().add(txtDesc1);
        txtDesc1.setColumns(10);

        txtDesc2 = new JTextField();
        txtDesc2.setColumns(10);
        txtDesc2.setBounds(124, 33, 86, 20);
        getContentPane().add(txtDesc2);

        txtDesc3 = new JTextField();
        txtDesc3.setColumns(10);
        txtDesc3.setBounds(124, 58, 86, 20);
        getContentPane().add(txtDesc3);

        txtDesc4 = new JTextField();
        txtDesc4.setColumns(10);
        txtDesc4.setBounds(124, 83, 86, 20);
        getContentPane().add(txtDesc4);

        lblNewLabel_1 = new JLabel("%");
        lblNewLabel_1.setBounds(220, 11, 11, 14);
        getContentPane().add(lblNewLabel_1);

        lblNewLabel_2 = new JLabel("%");
        lblNewLabel_2.setBounds(220, 39, 11, 14);
        getContentPane().add(lblNewLabel_2);

        lblNewLabel_3 = new JLabel("%");
        lblNewLabel_3.setBounds(220, 61, 11, 14);
        getContentPane().add(lblNewLabel_3);

        lblNewLabel_4 = new JLabel("%");
        lblNewLabel_4.setBounds(220, 86, 11, 14);
        getContentPane().add(lblNewLabel_4);

        btnCancelar = new JButton("Cancelar");
        btnCancelar.addActionListener(this);
        btnCancelar.setBounds(303, 32, 89, 23);
        getContentPane().add(btnCancelar);

        btnAceptar = new JButton("Aceptar");
        btnAceptar.addActionListener(this);
        btnAceptar.setBounds(303, 7, 89, 23);
        getContentPane().add(btnAceptar);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == btnAceptar) {
            actionPerformedBtnAceptar(e);
        }
        if (e.getSource() == btnCancelar) {
            actionPerformedBtnCancelar(e);
        }
    }

    protected void actionPerformedBtnCancelar(ActionEvent e) {
        dispose();
    }

    protected void actionPerformedBtnAceptar(ActionEvent e) {
        try {
            double porcentaje1 = Double.parseDouble(txtDesc1.getText());
            double porcentaje2 = Double.parseDouble(txtDesc2.getText());
            double porcentaje3 = Double.parseDouble(txtDesc3.getText());
            double porcentaje4 = Double.parseDouble(txtDesc4.getText());

            JOptionPane.showMessageDialog(null, "Cambio Realizado con Éxito", "Aviso", JOptionPane.INFORMATION_MESSAGE);
        } catch (NumberFormatException ex) {
            JOptionPane.showMessageDialog(null, "Error: Ingrese un valor numérico válido", "Error", JOptionPane.ERROR_MESSAGE);
        }
        dispose();
    }
}