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https://issues.apache.org/jira/browse/LUCENE-1833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12745708#action_12745708
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Uwe Schindler commented on LUCENE-1833:
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...and also StringBuffers!
> When we move to java 1.5 in 3.0 we should replace all Interger, Long, etc
> construction with .valueOf
> ----------------------------------------------------------------------------------------------------
>
> Key: LUCENE-1833
> URL: https://issues.apache.org/jira/browse/LUCENE-1833
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Mark Miller
> Priority: Trivial
> Fix For: 3.0
>
>
> -128 to 128 are guaranteed to be cached and using valueOf in that case is 3.5
> times faster than using contructor
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