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https://issues.apache.org/jira/browse/LANG-472?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Phil Steitz updated LANG-472:
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Attachment: lang-472.patch
Looks like this is due to loss of significance in the multiply (per the comment
;)
Attached patch replaces the impl with the JDK-supplied method, maintaining the
(undocumented) non-negative behavior. Added test confirms that returned values
are evenly distributed mod 2.
This problem also affects nextLong(n) where n is sufficiently large. We should
either replace the implementation with something else that works for large
values of n or determine and document the upper bound.
> RandomUtils.nextLong() get all even number
> ------------------------------------------
>
> Key: LANG-472
> URL: https://issues.apache.org/jira/browse/LANG-472
> Project: Commons Lang
> Issue Type: Bug
> Environment: all system
> Reporter: zhangruimin
> Attachments: 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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