// Create a new workbook Workbook workbook = new Workbook(); IWorksheet worksheet = workbook.getWorksheets().get(0); worksheet.getRange("A1").setValue("Single Underline"); worksheet.getRange("A1").getFont().setUnderline(UnderlineType.Single); worksheet.getRange("A2").setValue("Double Underline"); worksheet.getRange("A2").getFont().setUnderline(UnderlineType.Double); worksheet.getRange("A3").setValue("Single Accounting Underline"); worksheet.getRange("A3").getFont().setUnderline(UnderlineType.SingleAccounting); worksheet.getRange("A4").setValue("Double Accounting Underline"); worksheet.getRange("A4").getFont().setUnderline(UnderlineType.DoubleAccounting); worksheet.getRange("A5").setValue("No Underline"); worksheet.getRange("A5").getFont().setUnderline(UnderlineType.None); worksheet.getUsedRange().autoFit(); // Save to an excel file workbook.save("FontUnderline.xlsx");