UDF: How to convert string with sign into integer

Hi
I have a number e.g 123456 (xsd:string) and sign - or + (xsd:string) and both are concatenated and fed into UDF. I want this string to be converted into Integer. If I use the below kind of statement it is not working and throwing the below error.
int BilledAmount  = Integer.parseInt(b[0]);
Exception:
RuntimeException in Message-Mapping transformation: Exception:[java.lang.NumberFormatException: For input string: "+000000000006684"]
Any guess on this issue ??
Regards
Kumar

Hey buddy,
Hope you are doing gr8, I'm getting ready leaving this friday..:-)
Aamir b[0] doesn't correspond to the first character of the string. He has multiple input values, hence he is using Context. See my structure and UDF I mentioned above, actually the above is his requirement I believe.
Yes, If you have + symbol in front of String and if you try to conver to Integer object it will throw an exception. Coz it doesn't make sense to add + symbol at all. if you don't have any sign in front it implies it's positive, am I right? But in case of negative, you need to explicitly include - symbol in front.
This is the reason that java couldn't able to convert the string that has + symbol in front, but it can in case it has - symbol in front.
I hope it clears a bit..
raj.

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