Class XorShift64StarRandom

    • Constructor Detail

      • XorShift64StarRandom

        public XorShift64StarRandom()
        Deprecated.
        Creates a new generator seeded using Util.randomSeed().
      • XorShift64StarRandom

        public XorShift64StarRandom​(long seed)
        Deprecated.
        Creates a new generator using a given seed.
        Parameters:
        seed - a nonzero seed for the generator (if zero, the generator will be seeded with Long.MIN_VALUE).
    • Method Detail

      • next

        protected int next​(int bits)
        Deprecated.
        Overrides:
        next in class Random
      • nextLong

        public long nextLong()
        Deprecated.
        Overrides:
        nextLong in class Random
      • nextInt

        public int nextInt()
        Deprecated.
        Overrides:
        nextInt in class Random
      • nextInt

        public int nextInt​(int n)
        Deprecated.
        Returns a pseudorandom, approximately uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.

        The hedge “approximately” is due to the fact that to be always faster than ThreadLocalRandom we return the upper 63 bits of nextLong() modulo n instead of using Random's fancy algorithm (which nextLong(long) uses though). This choice introduces a bias: the numbers from 0 to 263 mod n are slightly more likely than the other ones. In the worst case, “more likely” means 1.00000000023 times more likely, which is in practice undetectable (actually, due to the abysmally low quality of Random's generator, the result is statistically better in any case than Random.nextInt(int)'s) .

        If for some reason you need truly uniform generation, just use nextLong(long).

        Overrides:
        nextInt in class Random
        Parameters:
        n - the positive bound on the random number to be returned.
        Returns:
        the next pseudorandom int value between 0 (inclusive) and n (exclusive).
      • nextLong

        public long nextLong​(long n)
        Deprecated.
        Returns a pseudorandom uniformly distributed long value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence. The algorithm used to generate the value guarantees that the result is uniform, provided that the sequence of 64-bit values produced by this generator is.
        Parameters:
        n - the positive bound on the random number to be returned.
        Returns:
        the next pseudorandom long value between 0 (inclusive) and n (exclusive).
      • nextDouble

        public double nextDouble()
        Deprecated.
        Overrides:
        nextDouble in class Random
      • nextFloat

        public float nextFloat()
        Deprecated.
        Overrides:
        nextFloat in class Random
      • nextBoolean

        public boolean nextBoolean()
        Deprecated.
        Overrides:
        nextBoolean in class Random
      • nextBytes

        public void nextBytes​(byte[] bytes)
        Deprecated.
        Overrides:
        nextBytes in class Random
      • setSeed

        public void setSeed​(long seed)
        Deprecated.
        Sets the seed of this generator.

        The seed will be passed through HashCommon.murmurHash3(long). In this way, if the user passes a small value we will avoid the short irregular transient associated with states with a very small number of bits set.

        Overrides:
        setSeed in class Random
        Parameters:
        seed - a nonzero seed for this generator (if zero, the generator will be seeded with Long.MIN_VALUE).
      • setState

        public void setState​(long state)
        Deprecated.
        Sets the state of this generator.
        Parameters:
        state - the new state for this generator (must be nonzero).