CódigoInventario2

package inventario;
public class mas extends javax.swing.JFrame {

    public mas() {
        initComponents();
    }

    ventana ventana = new ventana();
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        btnsi = new javax.swing.JButton();
        btnno = new javax.swing.JButton();
        jLabel1 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        btnsi.setText("SÍ");
        btnsi.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnsiActionPerformed(evt);
            }
        });

        btnno.setText("NO");
        btnno.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnnoActionPerformed(evt);
            }
        });

        jLabel1.setText("Desea realizar más compras?");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(btnsi)
                        .addGap(48, 48, 48)
                        .addComponent(btnno))
                    .addComponent(jLabel1))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(24, 24, 24)
                .addComponent(jLabel1)
                .addGap(38, 38, 38)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(btnsi)
                    .addComponent(btnno))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>

    private void btnsiActionPerformed(java.awt.event.ActionEvent evt) {
        ventana.cambiarvalores();
        ventana open=new ventana();
        open.setVisible(true);
        open.setLocationRelativeTo(null);
        dispose();
    }

    private void btnnoActionPerformed(java.awt.event.ActionEvent evt) {
       System.exit(0);
    }

    public static void main(String args[]) {

        java.awt.EventQueue.invokeLater(() -> {
            new mas().setVisible(true);
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JButton btnno;
    private javax.swing.JButton btnsi;
    private javax.swing.JLabel jLabel1;
    // End of variables declaration
}