RandomGenerator
, RandomGenerator.JumpableGenerator
, RandomGenerator.StreamableGenerator
RandomGenerator.ArbitrarilyJumpableGenerator
RandomGenerator
public static interface RandomGenerator.LeapableGenerator extends RandomGenerator.JumpableGenerator
RandomGenerator.LeapableGenerator
objects by iterative leaping from a single original RandomGenerator.LeapableGenerator
object, and then for each such object produce a subseries of objects by iterative jumping. There is little conceptual difference between leaping and jumping, but typically a leap will be a very long jump in the state cycle (perhaps distance 2128 or so). Ideally, all RandomGenerator.LeapableGenerator
objects produced by iterative leaping and jumping from a single original RandomGenerator.LeapableGenerator
object are statistically independent of one another and individually uniform. In practice, one must settle for some approximation to independence and uniformity. In particular, a specific implementation may assume that each generator in a stream produced by the leaps
method is used to produce (by jumping) a number of objects no larger than 264. Implementors are advised to use algorithms whose period is at least 2191.
Methods are provided to perform a single leap operation and also to produce a stream of generators produced from the original by iterative copying and leaping of internal state. The generators produced must implement the RandomGenerator.JumpableGenerator
interface but need not also implement the RandomGenerator.LeapableGenerator
interface. A typical strategy for a multithreaded application is to create a single RandomGenerator.LeapableGenerator
object, calls its leaps
method exactly once, and then parcel out generators from the resulting stream, one to each thread. Then the jump
() method of each such generator be called to produce a substream of generator objects.
Objects that implement RandomGenerator.LeapableGenerator
are typically not cryptographically secure. Consider instead using SecureRandom
to get a cryptographically secure pseudo-random number generator for use by security-sensitive applications.
RandomGenerator.ArbitrarilyJumpableGenerator, RandomGenerator.JumpableGenerator, RandomGenerator.LeapableGenerator, RandomGenerator.SplittableGenerator, RandomGenerator.StreamableGenerator
Modifier and Type | Method | Description |
---|---|---|
RandomGenerator.LeapableGenerator |
copy() |
Returns a new generator whose internal state is an exact copy of this generator (therefore their future behavior should be identical if subjected to the same series of operations). |
default RandomGenerator.JumpableGenerator |
copyAndLeap() |
Copy this generator, leap this generator forward, then return the copy. |
void |
leap() |
Alter the state of this pseudorandom number generator so as to leap forward a large, fixed distance (typically 296 or more) within its state cycle. |
double |
leapDistance() |
Returns the distance by which the leap () method will leap forward within the state cycle of this generator object. |
default Stream |
leaps() |
Returns an effectively unlimited stream of new pseudorandom number generators, each of which implements the RandomGenerator.JumpableGenerator interface. |
default Stream |
leaps |
Returns a stream producing the given streamSize number of new pseudorandom number generators, each of which implements the RandomGenerator.JumpableGenerator interface. |
static RandomGenerator.LeapableGenerator |
of |
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
copyAndJump, jump, jumpDistance, jumps, jumps, rngs, rngs
static RandomGenerator.LeapableGenerator of(String name)
name
- Name of random number generator algorithm
RandomGenerator.LeapableGenerator
NullPointerException
- if name is nullIllegalArgumentException
- if the named algorithm is not foundRandomGenerator.LeapableGenerator copy()
copy
in interface RandomGenerator.JumpableGenerator
void leap()
double leapDistance()
leap
() method will leap forward within the state cycle of this generator object.double
value)default Stream<RandomGenerator.JumpableGenerator> leaps()
RandomGenerator.JumpableGenerator
interface.copy
() and leap
() on this generator, and the copies become the generators produced by the stream.leaps
(Long.MAX_VALUE
).RandomGenerator.JumpableGenerator
interfacedefault Stream<RandomGenerator.JumpableGenerator> leaps(long streamSize)
streamSize
number of new pseudorandom number generators, each of which implements the RandomGenerator.JumpableGenerator
interface.copy
() and leap
() on this generator, and the copies become the generators produced by the stream.streamSize
- the number of generators to generateRandomGenerator.JumpableGenerator
interfaceIllegalArgumentException
- if streamSize
is less than zerodefault RandomGenerator.JumpableGenerator copyAndLeap()
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/random/RandomGenerator.LeapableGenerator.html