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Editorial Team
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Asked: 2026-06-16T05:49:36+00:00

I’m running the same code on two machines. One (windows 7 64) uses: java

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I’m running the same code on two machines. One (windows 7 64) uses:

java version "1.7.0"
java<TM> SE Runtime Environment <build 1.7.0-b147>
Java HotSpot<TM> 64-Bit Server VM <build 21.0-b17, mixed code>

and the other (linux 64) uses:

java version "1.6.0_10"
Java(TM) SE Runtime Environment (build 1.6.0_10-b33)
Java HotSpot(TM) 64-Bit Server VM (build 11.0-b15, mixed mode)

I’m getting different outputs. I think it’s the VM because I copied the .class files, ran those, and still got different outputs.
Can anyone tell what could cause this?

EDIT:

The code is at http://pastebin.com/5EmYFkYn

The output should vary in between runs, yet not as drastically as it is between those two machines.

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1 Answer

  1. Editorial Team

    I get ~1.78 with Java 6 update 31 and ~3.8 with Java 7 update 7 on the same Linux box.

    However if I get the random seed with new Random(1) or some other number I get the same result. e.g. 1 always produces ~ 0.79 for the third number.

    Looking at the code for how the random seed is created, the code is completely different and I suspect the nextDouble() isn’t as random as it should be i.e. your values should vary more and it should matter so much how the seed was set.

    I get different results every time I run it on the same machine with the same version of Java. Most likely as there are random elements in the code.

    499470 0 3.7783771731449503 10000.355400975242 0.07565041858446288 42
499430 0 3.8374792234448916 10001.384837656298 0.07684781955465791 53
499604 0 3.868284648304009 10000.698947869778 0.07743242690681965 57
499114 0 3.822480313596936 10001.023197561686 0.07659315164172079 46
500030 0 3.8653339884104576 10000.112232176294 0.077302909223347 43

    Since it is different between runs on the same machine, I would expect them to be different on different machines, and different versions of Java as well.

    I would still seriously consider getting a newer version of Java than Java 7 “update nothing” or a version of Java 6 which is four years old.

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