Can i get the values from the same JSP page for further calculation.

Example:
Code:
<html> <form>
Enter ID:<input type="text" name="id"> <%
    String id=request.getParameter("id");
     int no=Integer.ParseInt(id);
:%> </form> </html>
For the above code I got NumberFormatExc eption if it is possible or any other way to achive this in same...