java jxl excel copy a sheet

XlsxCopySheet.java

private void copyExcelSheet(Sheet sourceSheet, WritableSheet destSheet) {
    for (int i = 0; i < sourceSheet.getRows(); ++i) {
        for (int j = 0; j < sourceSheet.getColumns(); ++j) {
            Cell cell = sourceSheet.getCell(j, i);
            Label label = new Label(j, i, cell.getContents().trim());
            CellFormat readFormat = cell.getCellFormat();
            if (readFormat != null) {
                label.setCellFormat( new WritableCellFormat(readFormat));
            }
            try {
                destSheet.addCell(label);
            } catch (WriteException e) {
                e.printStackTrace();
            }
        }
    }
}
//WritableWorkbook.write();