code: public void setComment(String comment) {
          if (comment != null) {
              this.comment = zc.getBytes(comment);
              if (this.comment.length > 0xffff)
                  throw new IllegalArgumentException("ZIP file comment too long.");
          }
      }
docs: Sets the ZIP file comment.
  @param comment the comment string
  @exception IllegalArgumentException if the length of the specified
  ZIP file comment is greater than 0xFFFF bytes