Untitled

Why is this string tokenizer making me cast to string?
try
            {
                BufferedReader infileCust =
                        new BufferedReader(new FileReader("C:\custDat.txt"));
    }
      catch(FileNotFoundException fnfe)
            {
                System.out.println(fnfe.toString());
            }
            catch(IOException ioe)
            {
                System.out.println(ioe.toString());
            }
        }

        public static void createCustomerList(BufferedReader infileCust,
                CustomerList custList) throws IOException
    {
        String  FirstName;
        String  LastName;
        int  CustId;


        //take first line of strings before breaking them up to first last and cust ID
        String StringToBreak = infileCust.readLine();
        //split up the string with string tokenizer
        StringTokenizer st = new StringTokenizer(StringToBreak);

        while(st.hasMoreElements()){
        FirstName = (String) st.nextElement();
        LastName = (String) st.nextElement();
        CustId = Integer.parseInt((String) st.nextElement());

        }