List Map data in excel using java

问题

Need help! I am trying to code a simple function that could return the data from an excel source. I am trying to create a list of Maps of data from excel file but the list that I am getting has the same values. All value are the same.

Here is my code:

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

public class ExcelReaderFinal {
    public static void main(String[] args) throws IOException {
        String path = "C:\\Users\\username\\Downloads\\TestFile.xlsx";
        FileInputStream fis = new FileInputStream(path);
        Workbook workbook = new XSSFWorkbook(fis);
        Sheet sheet = workbook.getSheetAt(0);
        int lastRow = sheet.getLastRowNum()-5;
        int lastColumn = 3;

        Map<String, Object> dataMap = new HashMap<String, Object>();
        ArrayList<Map<String, Object>> dataList = new ArrayList<>();

        for(int j=0; j<=lastRow; j++){


            for(int i=0; i<=lastColumn; i++) {

                Row row = sheet.getRow(4);
                Cell keyCell = row.getCell(i);
                Row val = sheet.getRow(5+j);
                Cell valueCell = val.getCell(i);

                String value = valueCell.getStringCellValue().trim();
                String key = keyCell.getStringCellValue().trim();
                dataMap.put(key, value);

            }
            dataList.add(dataMap);
        }
        System.out.println(dataList);
    }

}

my actual output is like this:

[{Negative Val=0, Account Number=121312C, Positive Val=20,000,000.00, Banko=RCBC}, {Negative Val=0, Account Number=121312C, Positive Val=20,000,000.00, Banko=RCBC}, {Negative Val=0, Account Number=121312C, Positive Val=20,000,000.00, Banko=RCBC}]

but my expected output is like this:

And here is my excel file source:

In Summary: