import org.apache.poi.ss.usermodel.*; import org.apache.poi.xssf.usermodel.XSSFWorkbook; public class ExcelWriter { public static void main(String[] args) { Workbook workbook = new XSSFWorkbook(); Sheet sheet = workbook.createSheet("Sheet1"); Row row = sheet.createRow(0); Cell cell = row.createCell(0); cell.setCellValue("Hello, World!"); try { FileOutputStream fileOutputStream = new FileOutputStream("output.xlsx"); workbook.write(fileOutputStream); fileOutputStream.close(); } catch (IOException e) { e.printStackTrace(); } } }