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https://issues.apache.org/jira/browse/MYFACES-3130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13031945#comment-13031945
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Martin Kočí commented on MYFACES-3130:
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mail topic: [core] performance: use indices instead of iterator (MYFACES-3130)
http://www.mail-archive.com/[email protected]/msg52979.html
> [PERF] Avoid unnecessary AbstractList$Itr instances
> ---------------------------------------------------
>
> Key: MYFACES-3130
> URL: https://issues.apache.org/jira/browse/MYFACES-3130
> Project: MyFaces Core
> Issue Type: Improvement
> Components: JSR-314
> Environment: myfaces core trunk
> Reporter: Martin Kočí
> Attachments: MYFACES-3130-example.patch
>
>
> Similar issue: MYFACES-3129
> loop from java 5:
> for (Object object: objects)
> creates new instance of AbstractList$Itr, if objects are instance of
> ArrayList.
> Similar situation is with explicit .iterator() call.
> In my testcases, it is about ~ 100 000 instances per request/response.
> Creation itself is cheap, but triggers GC lately.
> I suggest to use old index-style for (i = 0; i < childCount; i++) if
> possible. Are there any rawbacks of index-based iteration?
> Children is List and as implementation detail we know that it is instance of
> ArrayList.
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