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https://issues.apache.org/jira/browse/LANG-784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13184807#comment-13184807
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Henri Yandell commented on LANG-784:
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I agreed with Arnaud that this is odd. Primarily because of the following:
System.err.println(StringUtils.difference("abc", "ab"));
This results in an empty String. That's just useless :) The answer is "c" and
not empty String. Easy to fix by swapping the parameters based on length so
that the longer parameter is always second.
API-wise, I wouldn't want to change if it was only the example that Arnaud
lists, but if any related content returns a non-intuitive reply it seems to me
that the method is buggy and should be fixed.
> 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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