How to Iterate Through Cells in Excel in Selenium - apache-poi

Question

I am using selenium webdriver to register my application..
Now I wanted take the values of username, password, confirm password, email and telephone number. I have used for loop to iterate this.. But when app grows, the fields are added more on the same page. I have to change again the limit value in for loop..
Can I use Iterator to check for a row, if the cell is empty, it should stop and control should be given to the testCase..
Can any one let me know how to use Iterator for this???
package com.xcha.selenium.utitlity;
import java.io.IOException;
import java.util.ArrayList;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class ReadExcel extends GlobalVariables {
/**
* #param args
* #throws IOException
*/
public static ArrayList readExcel(int rowcounter) throws IOException {
XSSFWorkbook srcBook = new XSSFWorkbook("./prop.xlsx");
XSSFSheet sourceSheet = srcBook.getSheetAt(0);
int rownum = rowcounter;
XSSFRow sourceRow = sourceSheet.getRow(rownum);
int lastcellNum = sourceRow.getLastCellNum() - 1;
int lastrowNum = sourceSheet.getLastRowNum() - 1;
ArrayList<String> rowValues = new ArrayList<String>();
for (int i = 0; i <= lastcellNum; i++) {
String val = (sourceRow.getCell(i)).getRichStringCellValue()
.getString();
System.out.println(val);
rowValues.add(val);
}
System.out.println("Printing Arraylist");
for (String strVal : rowValues) {
System.out.println(strVal);
}
return rowValues;
}
}