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Asked: 2026-06-02T07:07:58+00:00

I’m using the Random class in Java as a pseudo-random number generator. I’m using

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I’m using the Random class in Java as a pseudo-random number generator. I’m using the function nextDouble a lot of times (~10^5). How many times before I have to reseed to prevent from getting the same numbers? Is reseeding needed?

    Random generator = new Random();
    double[] numbers = new double[n];
    for (int i = 0; i < n; i++) numbers[i] = generator.nextDouble();

This is for an experiment, the numbers will be used as coordinates for points on a space, so I want the distribution to be as uniform as possible.

Also how do I reseed? Where do I get the int seed from?

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1 Answer

  1. Editorial Team

    The random number generator will produce a random double from two random int values. The internal seed has 48 bit, so the random sequence repeats after at most 2^48 int values, or 2^47 double values.

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