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From Alexander Klimetschek <aklim...@day.com>
Subject Re: Generics generator class
Date Wed, 06 May 2009 10:56:01 GMT
On Wed, May 6, 2009 at 12:35 PM, Thomas Müller <thomas.mueller@day.com> wrote:
> My test case is:
>
> public static void main(String[] args) {
>    for (int i = 0; i < 3; i++) {
>        long start = System.currentTimeMillis();
>        ArrayList list = new ArrayList();
>        for (int j = 0; j < 1000000000; j++) {
>            list.size();
>        }
>        System.out.println(System.currentTimeMillis() - start);
>    }
> }
>
> With JDK 1.5 (Mac OS X): ArrayList declaration: 3028 List declaration: 8037

Interestingly, JDK 1.6 (Mac OS X) is much faster, both variants give
~1400. The results with 1.5 were the same as yours.

But the really interesting thing is that with 1.6, the first of the 3
runs of the test in both variants only takes 12 to 14 ms. What kind of
optimization could that be, which only works in the first run?

Regards,
Alex

-- 
Alexander Klimetschek
alexander.klimetschek@day.com

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