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https://issues.apache.org/jira/browse/LUCENE-1935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12761374#action_12761374
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Paul Elschot commented on LUCENE-1935:
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It was to avoid the performance impact of casting, however I don't remember how
big the performance impact was.
I would hope that nowadays the added casts are optimized away by the JIT.
> Generify PriorityQueue
> ----------------------
>
> Key: LUCENE-1935
> URL: https://issues.apache.org/jira/browse/LUCENE-1935
> Project: Lucene - Java
> Issue Type: Task
> Components: Other
> Affects Versions: 2.9
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 3.0
>
> Attachments: LUCENE-1935.patch
>
>
> Priority Queue should use generics like all other Java 5 Collection API
> classes. This very simple, but makes code more readable.
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