halpplz

    public void load()
    {
        Scanner scan1 = null;
        Scanner scan2 = null;
    ArrayList MD51 = new ArrayList();
    ArrayList MD52 = new ArrayList();

        try
        {
            scan1 = new Scanner(new FileReader(input1));
            scan2 = new Scanner(new FileReader(input2));
        }
        catch (FileNotFoundException ex)
        {
            ex.printStackTrace();
        }

        while (scan1.hasNextLine())
        {
            scan1.useDelimiter("\n");
            String text = scan1.nextLine();
            Scanner scanner = new Scanner(text);

            while (scanner.hasNext())
            {
                scanner.next();
                MD51.add(text);
            }
        }

        while (scan2.hasNextLine())
        {
            scan2.useDelimiter("\n");
            String text = scan2.nextLine();

            Scanner scanner = new Scanner(text);
            while (scanner.hasNext())
            {
                scanner.next();
                MD52.add(text);
            }
        }
    }
    public int findDoubles()
    {
        int MD51Count = 0;
        int MD52Count = 0;
    int count;

        Object current1 =  MD51.get(MD51Count);
        Object current2 =  MD52.get(MD52Count);

        while (current1 != null && current2 != null)
        {
            if (current1 == current2)
            {
                count++;
                MD51Count++;
                MD52Count++;
            }
            else
            {
                MD51Count++;
                MD52Count++;
            }
        }

        return count;
    }