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https://issues.apache.org/jira/browse/LANG-784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13184871#comment-13184871
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Sebb commented on LANG-784:
---------------------------
Or the Javadoc should be fixed.
The first sentence is misleading as can be taken to imply that the method is
symmetric.
However, the method currently behaves more like arithmetical difference, which
is not symmetric.
Are there any use cases where the non-symmetric behaviour is useful?
If we are not sure, then one could add a symmetricDifference method.
> 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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