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https://issues.apache.org/jira/browse/LANG-1109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Duncan Jones updated LANG-1109:
-------------------------------
Fix Version/s: (was: Review Patch)
Discussion
Thanks for submitting your suggestion. I've marked this as "Discussion" as
we'll have to discuss whether the functionality is something that suits Lang.
If we decide to go ahead with this, it would be much easier to add this if you
can provide a patch file that also includes your unit tests. Some general
advice on submitting patches can be found
[here|https://commons.apache.org/patches.html].
> Number percentage formatting with fractional digits
> ---------------------------------------------------
>
> Key: LANG-1109
> URL: https://issues.apache.org/jira/browse/LANG-1109
> Project: Commons Lang
> Issue Type: New Feature
> Components: lang.*
> Reporter: Marco Janc
> Fix For: Discussion
>
>
> Java built-in number formatter does formats Number locale aware with
> fractional digits defined by the defined scale of the Number, aswell the
> required precision (trims trailing zeros).
> For some reason Java's built-in percentage number formatter does not formats
> fractional digits. So i wrote a function which has same behavior as the Java
> built-in number formatter but with percentage formatting.
> {code:java}
> /**
> * Formats the given Number as percentage with necessary precision.
> * This serves as a workaround for {@link
> NumberFormat#getPercentInstance()} which does not renders fractional
> * digits.
> *
> * @param number
> * @param locale
> *
> * @return
> */
> public static String formatPercentFraction(final Number number, final
> Locale locale)
> {
> if (number == null)
> return null;
> // get string representation with dot
> final String strNumber =
> NumberFormat.getNumberInstance(Locale.US).format(number.doubleValue());
> // create exact BigDecimal and convert to get scale
> final BigDecimal dNumber = new
> BigDecimal(strNumber).multiply(new BigDecimal(100));
> final NumberFormat percentScaleFormat =
> NumberFormat.getPercentInstance(locale);
> percentScaleFormat.setMaximumFractionDigits(Math.max(0,
> dNumber.scale()));
> // convert back for locale percent formatter
> return percentScaleFormat.format(dNumber.multiply(new
> BigDecimal(0.01)));
> }
> {code}
> I also unit tested it with many inputs.
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