code: public DelimiterWriterFactory addColumnTitles(final Collection<String> columnTitles) {
          if (columnTitles != null) {
              for (final String columnTitle : columnTitles) {
                  addColumnTitle(columnTitle);
              }
          }
          return this;
      }
docs: Convenience method to add a series of cols in one go.
  
  @param columnTitles
  @return this
  @since 4.0