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From "Sebb (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LANG-784) Strange behavior on StringUtils.difference
Date Thu, 12 Jan 2012 11:08:39 GMT

    [ 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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