RFR JDK-8011200 (was 7143928) : (coll) Optimize for Empty ArrayList and HashMap (original) (raw)

Doug Lea dl at cs.oswego.edu
Wed Apr 10 22:49:01 UTC 2013

On 04/10/13 17:26, Martin Buchholz wrote:

I'm willing to accept John as an authority on hotspot optimization. I'm surprised that null checks aren't more close to free in part because recent jsr166 code has been introducing more explicit null checks, sometimes in code where the reference being checked is "known" not to be null.

Some are cheap. Some aren't. Always measure.

-Doug

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