Unable to understand how to merge cells in POI

[sunnykeerthi <su...@gmail.com>]

I'm writing a program where I need to merge rows in Excel sheet. Currently,
I'm able to merge the starting rows, but when coming to the end, I'm unable
to know where it is going wrong. Below is my code.

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.util.CellRangeAddress;

public class RowsMerge {

    public static void main(String[] args) throws IOException {
        FileInputStream fin = new FileInputStream(
                new File("C:\\D\\Sheets\\Sample Sheets\\dummy.xls"));
        HSSFWorkbook workbook = new HSSFWorkbook(fin);
        HSSFSheet sheet = workbook.getSheetAt(0);
        int row = sheet.getPhysicalNumberOfRows();
        String currentLawName, currentCountry, currentAssociate,
previousLawName, previousCountry, previousAssociate;
        String currentPages, previousPages;
        int startIndex = 1, finalIndex = 0, tempNum = 0;
        System.out.println(row);
        for (int i = 2; i < (row - 1); i++) {
            currentAssociate = sheet.getRow(i).getCell(0).toString();
            currentLawName = sheet.getRow(i).getCell(1).toString();
            currentCountry = sheet.getRow(i).getCell(2).toString();
            currentPages = sheet.getRow(i).getCell(3).toString();

            previousAssociate = sheet.getRow(i - 1).getCell(0).toString();
            previousLawName = sheet.getRow(i - 1).getCell(1).toString();
            previousCountry = sheet.getRow(i - 1).getCell(2).toString();
            previousPages = sheet.getRow(i - 1).getCell(3).toString();

            if (currentAssociate.equals(previousAssociate) &&
currentCountry.equals(previousCountry)
                    && currentLawName.equals(previousLawName) &&
currentPages.equals(previousPages)) {
                finalIndex += 1;
            } else {
                sendRangeToMergeCells(startIndex, finalIndex, sheet);
                startIndex = i;
                finalIndex = 0;

            }

        }
        FileOutputStream fileOut = new
FileOutputStream("C:\\D\\Sheets\\Sample Sheets\\dummy.xls");
        workbook.write(fileOut);
        fileOut.close();
    }

    private static void sendRangeToMergeCells(int startIndex, int
finalIndex, HSSFSheet sheet) {
        System.out.println(startIndex + "\t" + (startIndex + finalIndex));
        CellRangeAddress region = CellRangeAddress
                .valueOf("D" + (startIndex + 1) + ":D" + ((startIndex +
finalIndex) + 1));
        sheet.addMergedRegion(region);
    }

}
Below is my Excel Sheet
SourceExcel:

<http://apache-poi.1045710.n5.nabble.com/file/n5723106/ExcelSrc.png> 

Current O/P: 
<http://apache-poi.1045710.n5.nabble.com/file/n5723106/currentOP.png> 
Expected o/p: 

<http://apache-poi.1045710.n5.nabble.com/file/n5723106/expectedOP.png> 


please let me know where am I going wrong and how can I fix this.



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