Re: HashMap and Array issue

I have this JSP where I have alot of fields with conditions.
I would like to make it more efficient and use a for loop.
Here is an example (showing 2 fields for example only):

<%@ page language="java" import="java.util.*" %>
<%
HashMap errors = new HashMap();
String firstname = "Joe";
String lastname = "Miller";

   if (!firstname.equals(""))
   {
       errors.put("firstname",firstname);
   }
   if (!lastname.equals(""))
   {
       errors.put("lastname",lastname);
   }

out.println(errors.get("firstname"));
out.println(errors.get("lastname"));
%>