text: public String toString() {StringBuilder sb = new StringBuilder();sb.append(getClass().getName());sb.append(" [");if (externalWorkbookNumber >= 0) {sb.append(" [");sb.append("workbook=").append(getExternalWorkbookNumber());sb.append("] ");}sb.append("sheet=").append(getSheetName());if (lastSheetName != null) {sb.append(" : ");sb.append("sheet=").append(lastSheetName);}sb.append(" ! ");sb.append(formatReferenceAsString());sb.append("]");return sb.toString();}