Apache poi populate the cell value by formula

Question

I am new to apache poi trying to write the excel file I am facing some issue while setting the formula to cell.

Below is my sample excel:

User	Country	Value
Rohit	UK
John	IND

I need to populate the Value column based on the on the User and Country fields. Below is the excel formula which I want to convert to apache poi java

=IF(AND(LEN([@[User]]) > 0, [@Country] = "UK"),1,0)

can anybody help me ?

sample code

try {
        InputStream inputStream = this.getClass().getResourceAsStream("/sample.xlsx");
        XSSFWorkbook workbook = new XSSFWorkbook (inputStream);
        System.out.println("inside the controller");
        XSSFSheet sheet = workbook.getSheetAt(0);
        Object[][] bookData = {
                {"Rohit","UK",null},
                {"John","IND",null}                   
        };

        int rowCount = sheet.getLastRowNum();
        int count=0;
        //CellStyle cell1;
        for (Object[] aBook : bookData) {
            Row row = sheet.createRow(++rowCount);

            int columnCount = 0;

            Cell cell = row.createCell(columnCount);
            // cell.setCellValue(rowCount);

            for (Object field : aBook) {
                cell = row.createCell(columnCount++);
                if(field==null){
                    cell.setCellFormula("IF(AND(LEN(A1:A3)>0,(B1:B3)=UK),1,0)"); 
                }
                else if (field instanceof String) {
                  cell.setCellValue((String) field);
                } else if (field instanceof Integer) {
                    cell.setCellValue((Integer) field);
                }
            }
        }

       java.util.List<XSSFTable> l = sheet.getTables();
        l.get(0).getCTTable().setRef("A1:L4");

       FileOutputStream outputStream = new FileOutputStream("D://demo/sample_with_values.xlsx");
        workbook.write(outputStream);
        workbook.close();
        outputStream.close();

    } catch (IOException | EncryptedDocumentException ex) {
        ex.printStackTrace();
    }

Answer 1

public static void main(String[] args) throws Exception {
    HSSFWorkbook workbook = new HSSFWorkbook();
    HSSFSheet spreadsheet = workbook.createSheet("example");

    HSSFRow row = spreadsheet.createRow((short) 0);
    row.createCell(0).setCellValue("User");
    row.createCell(1).setCellValue("Country");
    row.createCell(2).setCellValue("Value");

    row = spreadsheet.createRow((short) 1);
    row.createCell(0).setCellValue("Rohit");
    row.createCell(1).setCellValue("UK");
    row.createCell(2).setCellFormula("IF(AND(LEN(A1:A3)>0,(B1:B3)=\"UK\"),1,0)");

    row = spreadsheet.createRow((short) 2);
    row.createCell(0).setCellValue("John");
    row.createCell(1).setCellValue("IND");
    row.createCell(2).setCellFormula("IF(AND(LEN(A1:A3)>0,(B1:B3)=\"UK\"),1,0)");

    FileOutputStream out = 
            new FileOutputStream(
                    new File("/Users/anand.keshri/workspace/poi/first.xls")
                    );
    workbook.write(out);
    out.close();
    workbook.close();
    System.out.println("first.xls written successfully");