code: public boolean isResourceURL(String url) {
          boolean result = false;
          if (null == url) {
              throw new NullPointerException("null url");
          }
          result = url.contains(ResourceHandler.RESOURCE_IDENTIFIER);
          
          return result;
          
      }
docs: <p class="changed_added_2_2">Return {@code true} if the argument {@code url}
  contains the string given by the value of the constant
  {@link ResourceHandler#RESOURCE_IDENTIFIER}, false otherwise.</p>
  
  @param url the url to inspect for the presence of {@link ResourceHandler#RESOURCE_IDENTIFIER}.
  
  @throws NullPointerException if the argument url is {@code null}.