code: public void selectByIndex(String[] indexes) {
          for (int i = 0; i < indexes.length; i++) {
              selectByIndex(Integer.parseInt(indexes[i]));
          }
      }
docs: Select the option at the given indexes. This is done by examing the "index" attribute of an element, and not
  merely by counting.
  
  @param indexes
  the indexes to select