Check if sender is on allowedList

package testet.main;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class UtilFuncs {

    public static void main(String[] args) {
        System.out.println(checkSender("user1"));
    }

    public static boolean checkSender(String sender) {
        String fileName = "nameList.txt";
        File file = new File(fileName);
        List<String> allowedList = new ArrayList<String>();
        Iterator iter = allowedList.iterator();
        String current;
        int lineCount = 0;
        String[] allowedArray = null;
        boolean isAllowed = false;

        Scanner fileIn;
        Scanner fileIn2;
        try {
            fileIn = new Scanner(file);
            fileIn2 = new Scanner(file);

            while (fileIn.hasNextLine()) {
                System.out.println(fileIn.hasNextLine());
                lineCount++;
                System.out.println(lineCount);
                System.out.println(fileIn.next());
            }

            allowedArray = new String[lineCount];

            for (int i = 0; i < allowedArray.length; i++) {
                current = fileIn2.next();
                allowedArray[i] = current;
                System.out.println(current);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }




        System.out.println("allowedArray.length is " + allowedArray.length);

        for (int i = 0; i < allowedArray.length; i++) {
            System.out.println("allowedArray[" + i + "] is " + allowedArray[i]);

            System.out.println("Sender is " + sender);
            System.out.println("Current check is " + allowedArray[i]);
            System.out.println(sender.toString() == allowedArray[i].toString());
            if (allowedArray[i] == sender) {
                isAllowed = true;
                System.out.println("Current check is " + sender + " vs " + allowedArray[i]);
            }
        }

        if (isAllowed == true) {
            return true;
        } else {
            return false;
        }
    }
}