Referencing Excel cell and range in Java

import com.gembox.spreadsheet.*;

class Program {

    public static void main(String[] args) throws java.io.IOException {
        // If using the Professional version, put your serial key below.
        SpreadsheetInfo.setLicense("FREE-LIMITED-KEY");

        ExcelFile workbook = new ExcelFile();
        ExcelWorksheet worksheet = workbook.addWorksheet("Cell Referencing");

        worksheet.getCell(0, 0).setValue("Cell referencing examples:");

        worksheet.getCell("B2").setValue("Cell B2.");
        worksheet.getCell(6, 0).setValue("Cell in row 7 and column A.");

        worksheet.getRow(2).getCell(0).setValue("Cell in row 3 and column A.");
        worksheet.getRow("4").getCell("B").setValue("Cell in row 4 and column B.");

        worksheet.getColumn(2).getCell(4).setValue("Cell in column C and row 5.");
        worksheet.getColumn("AA").getCell("6").setValue("Cell in AA column and row 6.");

        // Referencing Excel row's cell range.
        CellRange cellRange = worksheet.getRow(7).getCells();

        cellRange.get(0).setValue(cellRange.getIndexingMode().toString());
        cellRange.get(3).setValue("D8");
        cellRange.get("B").setValue("B8");

        // Referencing Excel column's cell range.
        cellRange = worksheet.getColumn(7).getCells();

        cellRange.get(0).setValue(cellRange.getIndexingMode().toString());
        cellRange.get(2).setValue("H3");
        cellRange.get("5").setValue("H5");

        // Referencing arbitrary Excel cell range.
        cellRange = worksheet.getCells().getSubrange("I2", "L8");
        cellRange.getStyle().getBorders().setBorders(MultipleBorders.outside(), SpreadsheetColor.fromArgb(0, 0, 128), LineStyle.DASHED);

        cellRange.get("J7").setValue(cellRange.getIndexingMode().toString());
        cellRange.get(0, 0).setValue("I2");
        cellRange.get("J3").setValue("J3");
        cellRange.get(4).setValue("I3"); // Cell range width is 4 (I J K L).

        // Set column widths and some print options
        double[] columnWidths = new double[] { 175, 174, 174, 24, Double.NaN, Double.NaN, Double.NaN, 54, 19, 81 };
        for (int i = 0; i < columnWidths.length; i++)
            if (!Double.isNaN(columnWidths[i]))
                worksheet.getColumn(i).setWidth(columnWidths[i], LengthUnit.PIXEL);

        worksheet.getPrintOptions().setPrintGridlines(true);
        worksheet.getPrintOptions().setPrintHeadings(true);

        workbook.save("Cell Referencing.%OutputFileType%");
    }
}