Added in API level 35

Summary: Methods | Inherited Methods

RandomGenerator.SplittableGenerator

public static interface RandomGenerator.SplittableGenerator
implements RandomGenerator.StreamableGenerator

java.util.random.RandomGenerator.SplittableGenerator

Known indirect subclasses

SplittableRandom A generator of uniform pseudorandom values (with period 2⁶⁴) applicable for use in (among other contexts) isolated parallel computations that may generate subtasks.

This interface is designed to provide a common protocol for objects that generate sequences of pseudorandom values and can be split into two objects (the original one and a new one) each of which obey that same protocol (and therefore can be recursively split indefinitely).

Ideally, all SplittableGenerator objects produced by recursive splitting from a single original 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 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 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.

Summary

Public methods
`static RandomGenerator.SplittableGenerator`	`of(String name)` Returns an instance of `SplittableGenerator` that utilizes the `name` algorithm.
`default Stream<RandomGenerator>`	`rngs(long streamSize)` Returns a stream producing the given `streamSize` number of new pseudorandom number generators, each of which implements the `RandomGenerator` interface.
`default Stream<RandomGenerator>`	`rngs()` Returns an effectively unlimited stream of new pseudorandom number generators, each of which implements the `RandomGenerator` interface.
`abstract RandomGenerator.SplittableGenerator`	`split(RandomGenerator.SplittableGenerator source)` Returns a new pseudorandom number generator, split off from this one, that implements the `RandomGenerator` and `SplittableGenerator` interfaces.
`abstract RandomGenerator.SplittableGenerator`	`split()` Returns a new pseudorandom number generator, split off from this one, that implements the `RandomGenerator` and `SplittableGenerator` interfaces.
`default Stream<RandomGenerator.SplittableGenerator>`	`splits()` Returns an effectively unlimited stream of new pseudorandom number generators, each of which implements the `SplittableGenerator` interface.
`abstract Stream<RandomGenerator.SplittableGenerator>`	`splits(long streamSize, RandomGenerator.SplittableGenerator source)` Returns a stream producing the given `streamSize` number of new pseudorandom number generators, each of which implements the `SplittableGenerator` interface.
`abstract Stream<RandomGenerator.SplittableGenerator>`	`splits(long streamSize)` Returns a stream producing the given `streamSize` number of new pseudorandom number generators, each of which implements the `SplittableGenerator` interface.
`abstract Stream<RandomGenerator.SplittableGenerator>`	`splits(RandomGenerator.SplittableGenerator source)` Returns an effectively unlimited stream of new pseudorandom number generators, each of which implements the `SplittableGenerator` interface.

Inherited methods

From interface


        
          java.util.random.RandomGenerator.StreamableGenerator

`static RandomGenerator.StreamableGenerator`	`of(String name)` Returns an instance of `StreamableGenerator` that utilizes the `name` algorithm.
`default Stream<RandomGenerator>`	`rngs(long streamSize)` Returns an effectively unlimited stream of objects, each of which implements the `RandomGenerator` interface.
`abstract Stream<RandomGenerator>`	`rngs()` Returns an effectively unlimited stream of objects, each of which implements the `RandomGenerator` interface.

From interface


        
          java.util.random.RandomGenerator

`default DoubleStream`	`doubles(long streamSize, double randomNumberOrigin, double randomNumberBound)` Returns a stream producing the given `streamSize` number of pseudorandomly chosen `double` values, where each value is between the specified origin (inclusive) and the specified bound (exclusive).
`default DoubleStream`	`doubles(long streamSize)` Returns a stream producing the given `streamSize` number of pseudorandomly chosen `double` values.
`default DoubleStream`	`doubles()` Returns an effectively unlimited stream of pseudorandomly chosen `double` values.
`default DoubleStream`	`doubles(double randomNumberOrigin, double randomNumberBound)` Returns an effectively unlimited stream of pseudorandomly chosen `double` values, where each value is between the specified origin (inclusive) and the specified bound (exclusive).
`static RandomGenerator`	`getDefault()` Returns a `RandomGenerator` meeting the minimal requirement of having an algorithm whose state bits are greater than or equal 64.
`default IntStream`	`ints(long streamSize)` Returns a stream producing the given `streamSize` number of pseudorandomly chosen `int` values.
`default IntStream`	`ints(int randomNumberOrigin, int randomNumberBound)` Returns an effectively unlimited stream of pseudorandomly chosen `int` values, where each value is between the specified origin (inclusive) and the specified bound (exclusive).
`default IntStream`	`ints()` Returns an effectively unlimited stream of pseudorandomly chosen `int` values.
`default IntStream`	`ints(long streamSize, int randomNumberOrigin, int randomNumberBound)` Returns a stream producing the given `streamSize` number of pseudorandomly chosen `int` values, where each value is between the specified origin (inclusive) and the specified bound (exclusive).
`default boolean`	`isDeprecated()` Return true if the implementation of RandomGenerator (algorithm) has been marked for deprecation.
`default LongStream`	`longs(long streamSize)` Returns a stream producing the given `streamSize` number of pseudorandomly chosen `long` values.
`default LongStream`	`longs()` Returns an effectively unlimited stream of pseudorandomly chosen `long` values.
`default LongStream`	`longs(long randomNumberOrigin, long randomNumberBound)` Returns an effectively unlimited stream of pseudorandomly chosen `long` values, where each value is between the specified origin (inclusive) and the specified bound (exclusive).
`default LongStream`	`longs(long streamSize, long randomNumberOrigin, long randomNumberBound)` Returns a stream producing the given `streamSize` number of pseudorandomly chosen `long` values, where each value is between the specified origin (inclusive) and the specified bound (exclusive).
`default boolean`	`nextBoolean()` Returns a pseudorandomly chosen `boolean` value.
`default void`	`nextBytes(byte[] bytes)` Fills a user-supplied byte array with generated byte values pseudorandomly chosen uniformly from the range of values between -128 (inclusive) and 127 (inclusive).
`default double`	`nextDouble()` Returns a pseudorandom `double` value between zero (inclusive) and one (exclusive).
`default double`	`nextDouble(double bound)` Returns a pseudorandomly chosen `double` value between zero (inclusive) and the specified bound (exclusive).
`default double`	`nextDouble(double origin, double bound)` Returns a pseudorandomly chosen `double` value between the specified origin (inclusive) and the specified bound (exclusive).
`default double`	`nextExponential()` Returns a nonnegative `double` value pseudorandomly chosen from an exponential distribution whose mean is 1.
`default float`	`nextFloat(float origin, float bound)` Returns a pseudorandomly chosen `float` value between the specified origin (inclusive) and the specified bound (exclusive).
`default float`	`nextFloat()` Returns a pseudorandom `float` value between zero (inclusive) and one (exclusive).
`default float`	`nextFloat(float bound)` Returns a pseudorandomly chosen `float` value between zero (inclusive) and the specified bound (exclusive).
`default double`	`nextGaussian(double mean, double stddev)` Returns a `double` value pseudorandomly chosen from a Gaussian (normal) distribution with a mean and standard deviation specified by the arguments.
`default double`	`nextGaussian()` Returns a `double` value pseudorandomly chosen from a Gaussian (normal) distribution whose mean is 0 and whose standard deviation is 1.
`default int`	`nextInt(int origin, int bound)` Returns a pseudorandomly chosen `int` value between the specified origin (inclusive) and the specified bound (exclusive).
`default int`	`nextInt()` Returns a pseudorandomly chosen `int` value.
`default int`	`nextInt(int bound)` Returns a pseudorandomly chosen `int` value between zero (inclusive) and the specified bound (exclusive).
`default long`	`nextLong(long origin, long bound)` Returns a pseudorandomly chosen `long` value between the specified origin (inclusive) and the specified bound (exclusive).
`default long`	`nextLong(long bound)` Returns a pseudorandomly chosen `long` value between zero (inclusive) and the specified bound (exclusive).
`abstract long`	`nextLong()` Returns a pseudorandomly chosen `long` value.
`static RandomGenerator`	`of(String name)` Returns an instance of `RandomGenerator` that utilizes the `name` algorithm.

Public methods

of

Added in API level 35

public static RandomGenerator.SplittableGenerator of (String name)

Returns an instance of SplittableGenerator that utilizes the name algorithm.

Parameters
`name`	`String`: Name of random number generator algorithm

Returns
`RandomGenerator.SplittableGenerator`	An instance of `SplittableGenerator`

Throws
`NullPointerException`	if name is null
`IllegalArgumentException`	if the named algorithm is not found

rngs

Added in API level 35

public Stream<RandomGenerator> rngs (long streamSize)

Returns a stream producing the given streamSize number of new pseudorandom number generators, each of which implements the RandomGenerator interface. Ideally the generators in the stream will appear to be statistically independent.

Implementation Requirements:

The default implementation calls splits(streamSize).

Parameters
`streamSize`	`long`: the number of generators to generate

Returns
`Stream<RandomGenerator>`	a stream of objects that implement the `RandomGenerator` interface

Throws
`IllegalArgumentException`	if `streamSize` is less than zero

rngs

Added in API level 35

public Stream<RandomGenerator> rngs ()

Returns an effectively unlimited stream of new pseudorandom number generators, each of which implements the RandomGenerator interface. Ideally the generators in the stream will appear to be statistically independent.

Implementation Requirements:

The default implementation calls splits().

Returns
`Stream<RandomGenerator>`	a stream of objects that implement the `RandomGenerator` interface

split

Added in API level 35

public abstract RandomGenerator.SplittableGenerator split (RandomGenerator.SplittableGenerator source)

Returns a new pseudorandom number generator, split off from this one, that implements the RandomGenerator and SplittableGenerator interfaces.

Parameters
`source`	`RandomGenerator.SplittableGenerator`: a `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
`RandomGenerator.SplittableGenerator`	an object that implements the `RandomGenerator` and `SplittableGenerator` interfaces

Throws
`NullPointerException`	if source is null

split

Added in API level 35

public abstract RandomGenerator.SplittableGenerator split ()

Returns a new pseudorandom number generator, split off from this one, that implements the RandomGenerator and 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
`RandomGenerator.SplittableGenerator`	a new object that implements the `RandomGenerator` and `SplittableGenerator` interfaces

splits

Added in API level 35

public Stream<RandomGenerator.SplittableGenerator> splits ()

Returns an effectively unlimited stream of new pseudorandom number generators, each of which implements the SplittableGenerator interface.

This pseudorandom number generator may be used as a source of pseudorandom bits used to initialize the state the new ones.

Implementation Note:

It is permitted to implement this method in a manner equivalent to splits (Long.MAX_VALUE).

Implementation Requirements:

The default implementation invokes splits(this).

Returns
`Stream<RandomGenerator.SplittableGenerator>`	a stream of `SplittableGenerator` objects

splits

Added in API level 35

public abstract Stream<RandomGenerator.SplittableGenerator> splits (long streamSize, 
                RandomGenerator.SplittableGenerator source)

Returns a stream producing the given streamSize number of new pseudorandom number generators, each of which implements the SplittableGenerator interface.

Parameters
`streamSize`	`long`: the number of values to generate
`source`	`RandomGenerator.SplittableGenerator`: a `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
`Stream<RandomGenerator.SplittableGenerator>`	a stream of `SplittableGenerator` objects

Throws
`IllegalArgumentException`	if `streamSize` is less than zero
`NullPointerException`	if source is null

splits

Added in API level 35

public abstract Stream<RandomGenerator.SplittableGenerator> splits (long streamSize)

Returns a stream producing the given streamSize number of new pseudorandom number generators, each of which implements the 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`	`long`: the number of values to generate

Returns
`Stream<RandomGenerator.SplittableGenerator>`	a stream of `SplittableGenerator` objects

Throws
`IllegalArgumentException`	if `streamSize` is less than zero

splits

Added in API level 35

public abstract Stream<RandomGenerator.SplittableGenerator> splits (RandomGenerator.SplittableGenerator source)

Returns an effectively unlimited stream of new pseudorandom number generators, each of which implements the SplittableGenerator interface.

Implementation Note:

It is permitted to implement this method in a manner equivalent to splits (Long.MAX_VALUE, source).

Parameters
`source`	`RandomGenerator.SplittableGenerator`: a `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
`Stream<RandomGenerator.SplittableGenerator>`	a stream of `SplittableGenerator` objects

Throws
`NullPointerException`	if source is null