code: public static boolean isListElementsEmpty(final List<String> l) {
          for (final String s : l) {
              if (s != null && s.trim().length() > 0) {
                  return false;
              }
          }
          return true;
      }
docs: Checks a list of &lt;String&gt; elements to see if every element
  in the list is empty.
  
  @param l
  List of &lt;String&gt;
  @return boolean
  true when all elements are empty