My JoptionPane is popping up thrice but i can't seem to find what causes it

I'm using two JOptionPanes to ask the user for input but they pop-up thrice i think it has to do with my while/if loops my ExcelHandling class but I honestly don't know what's wrong with it.

Tried removing parts of the code in multiple classes to see if i could track where the multiple pop-up's come from but to no avail. It either runs thrice or not at all.

I've added the section of the code which i think is the culprit but if u think it might be in my main class or my ui class i can add them as well.

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

import java.io.IOException;
import java.util.Iterator;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.DataFormatter;
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;

/**
 *
 * @author Geert van den Berg
 */
public class ExcelHandling {

    Window useNew = new Window();
    private static final String FILE_NAME = "C:\\Users\\Holiday Planning\\HolidayPlanning.xlsx";
    private String userin = useNew.userinput1;
    private String userin1 = useNew.userinput2;
    final DataFormatter df = new DataFormatter();
    public String cellLocationDate = "";
    public String cellLocationUserName = "";

    ExcelHandling() throws IOException, FileNotFoundException {

        try {

            FileInputStream excelFile = new FileInputStream(new File(FILE_NAME));
            Workbook workbook = new XSSFWorkbook(excelFile);
            Sheet datatypeSheet = workbook.getSheetAt(0);
            Iterator<Row> iterator = datatypeSheet.iterator();

            while (iterator.hasNext()) {

                Row currentRow = iterator.next();
                Iterator<Cell> cellIterator = currentRow.iterator();

                while (cellIterator.hasNext()) {

                    Cell currentCell = cellIterator.next();
                    if (currentCell.getCellType() == CellType.STRING) {
                        System.out.print(currentCell.getStringCellValue() + "--");

                    } else if (currentCell.getCellType() == CellType.NUMERIC) {
                        System.out.print(currentCell.getNumericCellValue() + "--");

                    }

                    String formattedCellValue = df.formatCellValue(currentCell);
                    if (formattedCellValue.equals(userin)) {
                        System.out.println("a match is found");
                        cellLocationUserName = currentCell.getAddress().formatAsString();
                        System.out.println(cellLocationUserName);

                    }
                    if (formattedCellValue.equals(userin1)) {
                        System.out.println("A Date is found");
                        cellLocationDate = currentCell.getAddress().formatAsString();
                        System.out.println(cellLocationDate);


                    }

                }
                System.out.println();


            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}

I think this section of my program is running thrice for some reason which causes my seperate UI class to popup the JOptionPane thrice. (also the result of the final System.out.println(); is also displayed thrice but that seems to be the same problem. Any advice is welcome and I'm trying to make my code more towards the standard. Thanks in advance!