// Create a new workbook Workbook workbook = new Workbook(); IWorksheet worksheet = workbook.getWorksheets().get(0); worksheet.getRange("A1").getInterior().setPattern(Pattern.LightDown); worksheet.getRange("A1").getInterior().setColor(Color.GetPink()); worksheet.getRange("A1").getInterior().setPatternColorIndex(5); // Save to an excel file workbook.save("PatternFill.xlsx");