String manipulation: php to jsp

Question

Im converting a menu generation program from PHP to JSP.
Every page in my site has been allocated a page Id.
A pages pageId determines how the primary navigation of the page displays.
My Question
I need to determine the sub Menu parent id To do this in php I can just take the int value of the pageId string to get 2
<?php
$pageId = "2.1.3.4";
$subMenuParentId = intval($pageId);
?>
how can I do this in JSP ? Is there a better solution.
<%
String pageId = "2.1.3.4";
%>

Answer 1

You might find this test program novel...
import java.text.*;
public class msgfmttest
    public static void main(String[] args)
     MessageFormat msgfmt = new MessageFormat("{0,number,integer}.{1,number,integer}.{2,number,integer}.{3,number,integer}");
     String pageId = "2.1.3.4";
     try {
         Object[] levels = msgfmt.parse( pageId );
         int level1 = ( (Long)levels[0] ).intValue();
         int level2 = ( (Long)levels[1] ).intValue();
         int level3 = ( (Long)levels[2] ).intValue();
         int level4 = ( (Long)levels[3] ).intValue();
         System.out.println("level 1: " +  level1);
         System.out.println("level 2: " +  level2);
         System.out.println("level 3: " +  level3);
         System.out.println("level 4: " +  level4);
     catch(ParseException exc) {
         System.err.println("pageId is invalid");
}