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https://issues.apache.org/jira/browse/LANG-330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12767691#action_12767691
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Henri Yandell commented on LANG-330:
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Had hopes I could delete the join variants that take a char, but after a quick
performance test there is a notable 10% speed improvement (array of 100 length
10 Strings) to using a char over a single character String separator.
> Add StringBufferUtils or overload StringUtils methods
> -----------------------------------------------------
>
> Key: LANG-330
> URL: https://issues.apache.org/jira/browse/LANG-330
> Project: Commons Lang
> Issue Type: New Feature
> Reporter: Jörg Gottschling
> Fix For: 3.0
>
>
> There's especially one group of methods you should overload with StringBuffer
> (or Appendable in a special JDK5 Class?):
> StringUtils.join
> It should take a StringBuffer (/Appendable) as first Argument to which the
> Strings will be added.
> Usage Example:
> StringBuffer sql = new StringBuffer("SELECT * FROM foo WHERE bar IN (");
> StringUtils.join(sql, bars, ", ");
> sql.append(") AND bar NOT IN (");
> StringUtils.join(sql, noBars, ", ");
> sql.append(");");
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