public override bool Equals(Object obj){if (this == obj) return true;if (obj == null) return false;if (obj is HSSFCellStyle){HSSFCellStyle other = (HSSFCellStyle)obj;if (_format == null){if (other._format != null)return false;}else if (!_format.Equals(other._format))return false;if (index != other.index)return false;return true;}return false;}