static void user(){
     HashMap<String, Object> data = new HashMap<>();
     data = ud.validar("emilyc", "123");

     System.out.println(data);
        System.out.println(data.size());
   }
 /*
 Iterator it = data.entrySet().iterator();
 while (it.hasNext()) {
    Map.Entry e = (Map.Entry)it.next();
     System.out.println(e.getKey() + "=" + e.getValue());
 }*/