# \[JAVA\] random number generator is repeating?

**URL:** <https://forum.kirupa.com/t/java-random-number-generator-is-repeating/274369>\
**Category:** programming\
**Created:** [October 29, 2008, 2:34am UTC](https://forum.kirupa.com/t/java-random-number-generator-is-repeating/274369 "2008-10-29T02:34:21Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![NeoDreamer](https://avatars.discourse-cdn.com/v4/letter/n/ccd318/32.png) [@NeoDreamer](https://forum.kirupa.com/u/NeoDreamer)\
**Post date:** [October 29, 2008, 2:34am UTC](https://forum.kirupa.com/t/java-random-number-generator-is-repeating/274369/1 "2008-10-29T02:34:21Z")

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How often will Java’s random number generator repeat its sequence of random numbers? Here, I’m shooting 5,000 random photons out of a light source for indirect lighting using only one Random object. It looks like there are only a few dozen distinct places where the photons have landed.

[![](http://img20.imageshack.us/img20/1742/indirecthr8.jpg)](http://imageshack.us)