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From "Duncan Jones (JIRA)" <>
Subject [jira] [Commented] (LANG-1040) Javadoc for NumberUtils.isNumber() are not clear enough
Date Wed, 17 Dec 2014 07:55:13 GMT


Duncan Jones commented on LANG-1040:

If that's the expected behaviour, can you suggest a use for the method?

> Javadoc for NumberUtils.isNumber() are not clear enough
> -------------------------------------------------------
>                 Key: LANG-1040
>                 URL:
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.math.*
>    Affects Versions: 3.3.2
>            Reporter: Duncan Jones
>             Fix For: Discussion
> The Javadocs for {{NumberUtils.isNumber()}} do not clearly define what a valid number
is. The current trunk documentation states:
> {quote}Checks whether the String a valid Java number.
> Valid numbers include hexadecimal marked with the 0x or 0X qualifier, octal numbers,
scientific notation and numbers marked with a type qualifier (e.g. 123L).
> Non-hexadecimal strings beginning with a leading zero are treated as octal values. Thus
the string 09 will return false, since 9 is not a valid octal value. However, numbers beginning
with 0. are treated as decimal.
> Null and empty String will return false.{quote}
> In other Jira issues, I've seen people suggest that a number if valid if it can be used
when assigning to a suitable Java type. E.g. {{"FOO"}} is a valid number if {{long x = FOO}}
is valid (where {{long}} might be another numeric type). If this is the case, we should state
> Alternatively, the definition could be in terms of what is accepted by {{createNumber()}}.
> Or we define exactly what we accept by specifying a grammar in the Javadocs.

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