RFR: 8261290: Improve error message for NumberFormatException on null input

[Attila Szegedi]

On Sat, 20 Feb 2021 21:44:12 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> In Integer and Long, several of the parsing methods are specified to throw NumberFormatException on a null input rather than an NPE. That behavior is not proposed to be modified. However, I think it is reasonable for the NumberFormatException to have a more informative error message than just "null" -- specifically "Cannot parse null string" is proposed here.
> 
> All four prior occurrences of 
> 
> throw new NumberFormatException("null")
> 
> have be updated; there were no other instances of this idiom in the java.lang package.
> 
> All java/lang/{Integer, Long} regression tests pass with this change.

Rather straightforward ��

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Marked as reviewed by attila (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2663