- All Superinterfaces:
RandomGenerator
,RandomGenerator.StreamableGenerator
- All Known Implementing Classes:
SplittableRandom
- Enclosing interface:
- RandomGenerator
Ideally, all RandomGenerator.SplittableGenerator
objects produced by
recursive splitting from a single original RandomGenerator.SplittableGenerator
object are statistically independent of one another and individually
uniform. Therefore we would expect the set of values collectively
generated by a set of such objects to have the same statistical
properties as if the same quantity of values were generated by a single
thread using a single RandomGenerator.SplittableGenerator
object. In practice,
one must settle for some approximation to independence and uniformity.
Methods are provided to perform a single splitting operation and also to produce a stream of generators split off from the original (by either iterative or recursive splitting, or a combination).
Objects that implement RandomGenerator.SplittableGenerator
are typically not
cryptographically secure. Consider instead using SecureRandom
to
get a cryptographically secure pseudo-random number generator for use by
security-sensitive applications.
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Nested Class Summary
Nested classes/interfaces declared in interface java.util.random.RandomGenerator
RandomGenerator.ArbitrarilyJumpableGenerator, RandomGenerator.JumpableGenerator, RandomGenerator.LeapableGenerator, RandomGenerator.SplittableGenerator, RandomGenerator.StreamableGenerator
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Method Summary
Modifier and TypeMethodDescriptiondefault Stream<RandomGenerator>
rngs()
Returns an effectively unlimited stream of new pseudorandom number generators, each of which implements theRandomGenerator
interface.default Stream<RandomGenerator>
rngs
(long streamSize) Returns a stream producing the givenstreamSize
number of new pseudorandom number generators, each of which implements theRandomGenerator
interface.split()
Returns a new pseudorandom number generator, split off from this one, that implements theRandomGenerator
andRandomGenerator.SplittableGenerator
interfaces.Returns a new pseudorandom number generator, split off from this one, that implements theRandomGenerator
andRandomGenerator.SplittableGenerator
interfaces.splits()
Returns an effectively unlimited stream of new pseudorandom number generators, each of which implements theRandomGenerator.SplittableGenerator
interface.splits
(long streamSize) Returns a stream producing the givenstreamSize
number of new pseudorandom number generators, each of which implements theRandomGenerator.SplittableGenerator
interface.splits
(long streamSize, RandomGenerator.SplittableGenerator source) Returns a stream producing the givenstreamSize
number of new pseudorandom number generators, each of which implements theRandomGenerator.SplittableGenerator
interface.Returns an effectively unlimited stream of new pseudorandom number generators, each of which implements theRandomGenerator.SplittableGenerator
interface.Methods declared in interface java.util.random.RandomGenerator
doubles, doubles, doubles, doubles, ints, ints, ints, ints, isDeprecated, longs, longs, longs, longs, nextBoolean, nextBytes, nextDouble, nextDouble, nextDouble, nextExponential, nextFloat, nextFloat, nextFloat, nextGaussian, nextGaussian, nextInt, nextInt, nextInt, nextLong, nextLong, nextLong
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Method Details
-
of
- Parameters:
name
- Name of random number generator algorithm- Returns:
- An instance of
RandomGenerator.SplittableGenerator
- Throws:
NullPointerException
- if name is nullIllegalArgumentException
- if the named algorithm is not found
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split
Returns a new pseudorandom number generator, split off from this one, that implements theRandomGenerator
andRandomGenerator.SplittableGenerator
interfaces.This pseudorandom number generator may be used as a source of pseudorandom bits used to initialize the state of the new one.
- Returns:
- a new object that implements the
RandomGenerator
andRandomGenerator.SplittableGenerator
interfaces
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split
Returns a new pseudorandom number generator, split off from this one, that implements theRandomGenerator
andRandomGenerator.SplittableGenerator
interfaces.- Parameters:
source
- aRandomGenerator.SplittableGenerator
instance to be used instead of this one as a source of pseudorandom bits used to initialize the state of the new ones.- Returns:
- an object that implements the
RandomGenerator
andRandomGenerator.SplittableGenerator
interfaces - Throws:
NullPointerException
- if source is null
-
splits
Returns an effectively unlimited stream of new pseudorandom number generators, each of which implements theRandomGenerator.SplittableGenerator
interface.This pseudorandom number generator may be used as a source of pseudorandom bits used to initialize the state the new ones.
- Implementation Requirements:
- The default implementation invokes
splits(this)
. - Implementation Note:
- It is permitted to implement this method in a manner
equivalent to
splits
(Long.MAX_VALUE
). - Returns:
- a stream of
RandomGenerator.SplittableGenerator
objects
-
splits
Returns a stream producing the givenstreamSize
number of new pseudorandom number generators, each of which implements theRandomGenerator.SplittableGenerator
interface.This pseudorandom number generator may be used as a source of pseudorandom bits used to initialize the state the new ones.
- Parameters:
streamSize
- the number of values to generate- Returns:
- a stream of
RandomGenerator.SplittableGenerator
objects - Throws:
IllegalArgumentException
- ifstreamSize
is less than zero
-
splits
Returns an effectively unlimited stream of new pseudorandom number generators, each of which implements theRandomGenerator.SplittableGenerator
interface.- Implementation Note:
- It is permitted to implement this method in a manner
equivalent to
splits
(Long.MAX_VALUE
, source). - Parameters:
source
- aRandomGenerator.SplittableGenerator
instance to be used instead of this one as a source of pseudorandom bits used to initialize the state of the new ones.- Returns:
- a stream of
RandomGenerator.SplittableGenerator
objects - Throws:
NullPointerException
- if source is null
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splits
Stream<RandomGenerator.SplittableGenerator> splits(long streamSize, RandomGenerator.SplittableGenerator source) Returns a stream producing the givenstreamSize
number of new pseudorandom number generators, each of which implements theRandomGenerator.SplittableGenerator
interface.- Parameters:
streamSize
- the number of values to generatesource
- aRandomGenerator.SplittableGenerator
instance to be used instead of this one as a source of pseudorandom bits used to initialize the state of the new ones.- Returns:
- a stream of
RandomGenerator.SplittableGenerator
objects - Throws:
IllegalArgumentException
- ifstreamSize
is less than zeroNullPointerException
- if source is null
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rngs
Returns an effectively unlimited stream of new pseudorandom number generators, each of which implements theRandomGenerator
interface. Ideally the generators in the stream will appear to be statistically independent.- Specified by:
rngs
in interfaceRandomGenerator.StreamableGenerator
- Implementation Requirements:
- The default implementation calls
splits
(). - Returns:
- a stream of objects that implement the
RandomGenerator
interface
-
rngs
Returns a stream producing the givenstreamSize
number of new pseudorandom number generators, each of which implements theRandomGenerator
interface. Ideally the generators in the stream will appear to be statistically independent.- Specified by:
rngs
in interfaceRandomGenerator.StreamableGenerator
- Implementation Requirements:
- The default implementation calls
splits
(streamSize). - Parameters:
streamSize
- the number of generators to generate- Returns:
- a stream of objects that implement the
RandomGenerator
interface - Throws:
IllegalArgumentException
- ifstreamSize
is less than zero
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