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https://issues.apache.org/jira/browse/LANG-1646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17296058#comment-17296058
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Alex Herbert commented on LANG-1646:
------------------------------------
Upon further investigation recognition of zero uses the value of the exponent.
This does not matter if the magnitude is zero.
This passes:
{code:java}
assertEquals(0.0, Double.parseDouble("0.0e-2000"));
assertTrue(NumberUtils.isCreatable("0.0e-2000"));
{code}
These all fail:
{code:java}
assertEquals(Float.valueOf(0.0), NumberUtils.createNumber("0.0e-2000"));
assertEquals(Float.valueOf(0.0),
NumberUtils.createNumber("0.0e-2000F"));
assertEquals(Double.valueOf(0.0),
NumberUtils.createNumber("0.0e-2000D"));
{code}
So method must check the magnitude is zero but ignore the exponent. This will
allow it to return a number when isCreatable returns true.
> NumberUtils fails to create requested type for floating point zero
> ------------------------------------------------------------------
>
> Key: LANG-1646
> URL: https://issues.apache.org/jira/browse/LANG-1646
> Project: Commons Lang
> Issue Type: Bug
> Components: lang.math.*
> Affects Versions: 3.12.0
> Reporter: Alex Herbert
> Assignee: Alex Herbert
> Priority: Trivial
>
> This currently fails:
> {code:java}
> assertEquals(Float.valueOf(0), NumberUtils.createNumber("0F"));
> assertEquals(Double.valueOf(0), NumberUtils.createNumber("0D"));
> {code}
> This passes:
> {code:java}
> assertEquals(Float.valueOf(0), NumberUtils.createNumber("0.F"));
> assertEquals(Double.valueOf(0), NumberUtils.createNumber("0.D"));
> assertEquals(Float.valueOf(0), NumberUtils.createNumber("0e0F"));
> assertEquals(Double.valueOf(0), NumberUtils.createNumber("0e0D"));
> {code}
> This is due to the incorrect extraction of the mantissa for a floating point
> value when there is no exponent or decimal place as it includes the trailing
> format specifier (F or D). The input string is then not detected as being all
> zeros and the returned type is BigDecimal.
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