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From "Sebb (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LANG-472) RandomUtils.nextLong() get all even number
Date Thu, 04 Feb 2010 12:06:28 GMT

    [ https://issues.apache.org/jira/browse/LANG-472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12829592#action_12829592
] 

Sebb commented on LANG-472:
---------------------------

It's just occurred to me that using Math.abs() to ensure non-negative numbers means that the
value 0 will appear with half the expected freqency.

So maybe looping whilst looking for a non-negative number would be a better solution (let's
hope any run of negative numbers is not too long!)

> RandomUtils.nextLong() get all even number
> ------------------------------------------
>
>                 Key: LANG-472
>                 URL: https://issues.apache.org/jira/browse/LANG-472
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.math.*
>         Environment: all system
>            Reporter: zhangruimin
>             Fix For: 2.x
>
>         Attachments: LANG-472-alt.patch, lang-472.patch
>
>
> when we use the following code , we can see that the method produce only even number.
>          while (true) {
> //        for (int i = 0; i < 100; i++) {
>             if (RandomUtils.nextLong() % 2 == 1) {
>                 System.out.println("ok");
>             }
>         }

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