public boolean checkValid(String domain) {
   boolean isValid = false;
   for (WebModel web : webModels) {
     if (web.getDomain().equals(domain)) {
       isValid = web.loginWebsite();
     }
   }
   return isValid;
 }
 public void updateAll() {
   for (WebModel web : webModels) {
     web.updateAdvert();
   }
 }