public static void main(String args[]) throws IOException, InterruptedException {
        /* 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 | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
        
        
        int opc=0;
        BufferedReader leer=new BufferedReader(new InputStreamReader(System.in));
        
        
        
        do{
            Menu.Principal();
            
            try{
             opc=Integer.parseInt(leer.readLine());
            }catch(NumberFormatException ex)
            {ex.getMessage();}
            
            switch(opc){   
            case 1:
                java.awt.EventQueue.invokeLater(new Runnable() {
                    
                @Override
                public void run() {
                new Login().LoginDialog.setVisible(true);
                }
                });
                return;            
                        
            case 2:
                Farmacia.VentaMain();
                break;
                
            case 3:
                System.err.println("- - Saliendo del programa - -");
                Sleep.s2();
                System.exit(0);
            
            default:
                System.err.println("No ha ingresado una opcion correcta!!");
                break;
            }
             
        }while(opc!=3);        
    }