I18N- Problems in Internationalization of numbers

Question

I am trying to internationalize numbers.
Question 1: In the code when I try to parse "1,2,3,4,5.67" in US locale it is not throwing parse exception even though i have invalid position of group separators(,) in this String. How do we handle this?
Question 2: Is it mandatory to check if (form instanceof DecimalFormat) when using NumberFormat.getInstance() DOes this Factory method produce any other Format object? If yes How do we handle the else part?
import java.text.NumberFormat;
import java.text.DecimalFormat;
import java.text.ParseException;
import java.text.ParsePosition;
import java.util.Locale;
public class testNumberParsing {
public static void main(String[] args) {
String parseStr = "1,2,3,4,5.67";
Locale locale = Locale.US;
try
  Number parseNumber = parseNumber(locale,parseStr);
  System.out.println("Parsed Number: < "+parseNumber+" >");
catch(ParseException pe)
  System.out.println(pe.getLocalizedMessage());
public static Number parseNumber (Locale clientLocale,
                                  String numberStr )
           throws ParseException
NumberFormat form = NumberFormat.getInstance(clientLocale);
System.out.println(form.getClass());
if (form instanceof     DecimalFormat)
  DecimalFormat formatter = (DecimalFormat) form;
  formatter.setGroupingUsed(true);
  System.out.println(" Grouping Size "+ formatter.getGroupingSize());
  ParsePosition parsePos = new ParsePosition(0);
  Number parsedNumberObj = (Number) formatter.parse(numberStr,parsePos);
   if (numberStr.length() != parsePos.getIndex())
    String parseExceptionMsg = "Parse Error while parsing String: <"+
                              numberStr +
                              " > at Character Position "
                              +parsePos.getIndex();
     throw new ParseException(parseExceptionMsg,parsePos.getIndex());
   return parsedNumberObj;
  else
   form.setGroupingUsed(true);
   ParsePosition parsePos = new ParsePosition(0);
   Number parsedNumberObj = (Number) form.parse(numberStr,parsePos);
   if (numberStr.length() != parsePos.getIndex())
    String parseExceptionMsg = "Parse Error while parsing String: <"+
                                numberStr +
                              " > at Character Position "
                              +parsePos.getIndex();
     throw new ParseException(parseExceptionMsg,parsePos.getIndex());
    return parsedNumberObj;

Answer 1

Hi,
As my context attribute is of type string, i can pass the whole string and iam getting the same as expected.
As far as your context attribute is of type you can give a try with the following approaches one is by specifying a format for this in the dictionary type or else formatting using code.
http://java.sun.com/j2se/1.5.0/docs/api/java/util/Formatter.html
Regards
Ayyapparaj