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https://issues.apache.org/jira/browse/LANG-784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179594#comment-13179594
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Gary D. Gregory commented on LANG-784:
--------------------------------------
The Javadoc is clear IMO:
{quote}
Compares two Strings, and returns the portion where they differ.
(More precisely, return the remainder of the second String,
starting from where it's different from the first.
{quote}
A piece of the 2nd String is always returned, in this case a piece of "".
Also note this example:
StringUtils.difference("", "abc") = "abc"
> Strange behavior on StringUtils.difference
> ------------------------------------------
>
> Key: LANG-784
> URL: https://issues.apache.org/jira/browse/LANG-784
> Project: Commons Lang
> Issue Type: Improvement
> Components: lang.*
> Affects Versions: 3.0.1
> Reporter: Arnaud BRUNET
> Priority: Minor
>
> Hi,
> The behavior of the method StringUtils.difference () behaves in a
> non-intuitive (explain in the javadoc).
> StringUtils.difference ("abc", "") returns "" as intuitively expected to be
> "abc".
> Is it possible to change this behavior ?
> Regards,
> Arnaud
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