code: public int compare(final String what0, final String what1) {
      return (asc ? 1 : -1) * (collator.compare((null == what0) ? "" : what0, (null == what1) ? "" : what1));
    }
docs: <p>
  compare.
  </p>
  
  @param what0 a {@link java.lang.String} object.
  @param what1 a {@link java.lang.String} object.
  @return a int.