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

• next

  protected abstract int next(int bits)

  Generate next pseudorandom number.

  This method is the core generation algorithm. It is used by all the public generation methods for the various primitive types nextBoolean(), nextBytes(byte[]), nextDouble(), nextFloat(), nextGaussian(), nextInt(), next(int) and nextLong().

  Parameters:

  bits - number of random bits to produce

  Returns:

  random bits generated

• 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 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:

  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 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:

  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.