Class BitsStreamGenerator

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private double nextGaussian
      Next gaussian.
      private static long serialVersionUID
      Serializable version identifier
    • Constructor Summary

      Constructors 
      Constructor Description
      BitsStreamGenerator()
      Creates a new random number generator.
    • Method Summary

      All Methods Instance Methods Abstract Methods Concrete Methods 
      Modifier and Type Method Description
      void clear()
      Clears the cache used by the default implementation of nextGaussian.
      protected abstract int next​(int bits)
      Generate next pseudorandom number.
      boolean nextBoolean()
      Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence.
      void nextBytes​(byte[] bytes)
      Generates random bytes and places them into a user-supplied array.
      void nextBytes​(byte[] bytes, int start, int len)
      Generates random bytes and places them into a user-supplied array.
      private void nextBytesFill​(byte[] bytes, int start, int len)
      Generates random bytes and places them into a user-supplied array.
      double nextDouble()
      Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.
      float nextFloat()
      Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.
      double nextGaussian()
      Returns the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence.
      int nextInt()
      Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence.
      int nextInt​(int n)
      Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.
      long nextLong()
      Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence.
      long nextLong​(long n)
      Returns a pseudorandom, uniformly distributed long value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.
      abstract void setSeed​(int seed)
      Sets the seed of the underlying random number generator using an int seed.
      abstract void setSeed​(int[] seed)
      Sets the seed of the underlying random number generator using an int array seed.
      abstract void setSeed​(long seed)
      Sets the seed of the underlying random number generator using a long seed.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Field Detail

      • serialVersionUID

        private static final long serialVersionUID
        Serializable version identifier
        See Also:
        Constant Field Values
      • nextGaussian

        private double nextGaussian
        Next gaussian.
    • Constructor Detail

      • BitsStreamGenerator

        public BitsStreamGenerator()
        Creates a new random number generator.
    • Method Detail

      • setSeed

        public abstract void setSeed​(int seed)
        Sets the seed of the underlying random number generator using an int seed.

        Sequences of values generated starting with the same seeds should be identical.

        Specified by:
        setSeed in interface RandomGenerator
        Parameters:
        seed - the seed value
      • setSeed

        public abstract void setSeed​(int[] seed)
        Sets the seed of the underlying random number generator using an int array seed.

        Sequences of values generated starting with the same seeds should be identical.

        Specified by:
        setSeed in interface RandomGenerator
        Parameters:
        seed - the seed value
      • setSeed

        public abstract void setSeed​(long seed)
        Sets the seed of the underlying random number generator using a long seed.

        Sequences of values generated starting with the same seeds should be identical.

        Specified by:
        setSeed in interface RandomGenerator
        Parameters:
        seed - the seed value
      • nextBoolean

        public boolean nextBoolean()
        Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence.
        Specified by:
        nextBoolean in interface RandomGenerator
        Returns:
        the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence
      • nextDouble

        public double nextDouble()
        Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.
        Specified by:
        nextDouble in interface RandomGenerator
        Returns:
        the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence
      • nextFloat

        public float nextFloat()
        Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.
        Specified by:
        nextFloat in interface RandomGenerator
        Returns:
        the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence
      • nextGaussian

        public double nextGaussian()
        Returns the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence.
        Specified by:
        nextGaussian in interface RandomGenerator
        Returns:
        the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence
      • nextInt

        public int nextInt()
        Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence. All 232 possible int values should be produced with (approximately) equal probability.
        Specified by:
        nextInt in interface RandomGenerator
        Returns:
        the next pseudorandom, uniformly distributed int value from this random number generator's sequence
      • nextInt

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

        This default implementation is copied from Apache Harmony java.util.Random (r929253).

        Implementation notes:

        • If n is a power of 2, this method returns (int) ((n * (long) next(31)) >> 31).
        • If n is not a power of 2, what is returned is next(31) % n with next(31) values rejected (i.e. regenerated) until a value that is larger than the remainder of Integer.MAX_VALUE / n is generated. Rejection of this initial segment is necessary to ensure a uniform distribution.

        Specified by:
        nextInt in interface RandomGenerator
        Parameters:
        n - the bound on the random number to be returned. Must be positive.
        Returns:
        a pseudorandom, uniformly distributed int value between 0 (inclusive) and n (exclusive).
        Throws:
        java.lang.IllegalArgumentException - if n is not positive.
      • nextLong

        public long nextLong()
        Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence. All 264 possible long values should be produced with (approximately) equal probability.
        Specified by:
        nextLong in interface RandomGenerator
        Returns:
        the next pseudorandom, uniformly distributed long value from this random number generator's sequence
      • nextLong

        public long nextLong​(long n)
                      throws java.lang.IllegalArgumentException
        Returns a pseudorandom, uniformly distributed long value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.
        Parameters:
        n - the bound on the random number to be returned. Must be positive.
        Returns:
        a pseudorandom, uniformly distributed long value between 0 (inclusive) and n (exclusive).
        Throws:
        java.lang.IllegalArgumentException - if n is not positive.
      • clear

        public void clear()
        Clears the cache used by the default implementation of nextGaussian.
      • nextBytes

        public void nextBytes​(byte[] bytes)
        Generates random bytes and places them into a user-supplied array.

        The array is filled with bytes extracted from random integers. This implies that the number of random bytes generated may be larger than the length of the byte array.

        Specified by:
        nextBytes in interface RandomGenerator
        Parameters:
        bytes - Array in which to put the generated bytes. Cannot be null.
      • nextBytes

        public void nextBytes​(byte[] bytes,
                              int start,
                              int len)
        Generates random bytes and places them into a user-supplied array.

        The array is filled with bytes extracted from random integers. This implies that the number of random bytes generated may be larger than the length of the byte array.

        Parameters:
        bytes - Array in which to put the generated bytes. Cannot be null.
        start - Index at which to start inserting the generated bytes.
        len - Number of bytes to insert.
        Throws:
        OutOfRangeException - if start < 0 or start >= bytes.length.
        OutOfRangeException - if len < 0 or len > bytes.length - start.
      • nextBytesFill

        private void nextBytesFill​(byte[] bytes,
                                   int start,
                                   int len)
        Generates random bytes and places them into a user-supplied array.

        The array is filled with bytes extracted from random integers. This implies that the number of random bytes generated may be larger than the length of the byte array.

        Parameters:
        bytes - Array in which to put the generated bytes. Cannot be null.
        start - Index at which to start inserting the generated bytes.
        len - Number of bytes to insert.