Excel reader

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Map.Entry;
import java.util.TreeMap;

import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class Excel {

	public static void main(String[] args) throws IOException {

		ArrayList<String> offices = new ArrayList<String>();
		ArrayList<Double> incomes = new ArrayList<Double>();

		InputStream myxls = new FileInputStream("Incomes-Report.xlsx");
		XSSFWorkbook wb = new XSSFWorkbook(myxls);

		XSSFSheet sheet = wb.getSheetAt(0);

		for (int i = 1; i <= 11; i++) {

			XSSFRow rowOffice = sheet.getRow(i);
			XSSFCell cellOffice = rowOffice.getCell(0);

			XSSFRow rowIncomes = sheet.getRow(i);
			XSSFCell cellIncomes = rowIncomes.getCell(3);

			XSSFRow rowVat = sheet.getRow(i);
			XSSFCell cellVat = rowVat.getCell(4);

			offices.add(cellOffice.getStringCellValue().trim());
			incomes.add(cellIncomes.getNumericCellValue()
					+ cellVat.getNumericCellValue());
		}

		TreeMap<String, Double> total = new TreeMap<String, Double>();

		double grandTotal = 0.0d;
		for (int i = 0; i < offices.size(); i++) {

			Double temp = total.get(offices.get(i));
			if (temp == null) {
				temp = 0.0d;
			}
			total.put(offices.get(i), temp + incomes.get(i));
			grandTotal += incomes.get(i);
		}

		for (Entry<String, Double> wordEntry : total.entrySet()) {

			System.out.printf("%s Total -> %.2f%n", wordEntry.getKey(), wordEntry.getValue());

		}
		System.out.printf("Grand Total -> %.2f", grandTotal);
	}

}