Class XorShift64StarRandom
- All Implemented Interfaces:
Serializable
,java.util.random.RandomGenerator
- See Also:
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Nested Class Summary
Nested classes/interfaces inherited from interface java.util.random.RandomGenerator
java.util.random.RandomGenerator.ArbitrarilyJumpableGenerator, java.util.random.RandomGenerator.JumpableGenerator, java.util.random.RandomGenerator.LeapableGenerator, java.util.random.RandomGenerator.SplittableGenerator, java.util.random.RandomGenerator.StreamableGenerator
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Constructor Summary
ConstructorDescriptionDeprecated.Creates a new generator seeded usingUtil.randomSeed()
.XorShift64StarRandom
(long seed) Deprecated.Creates a new generator using a given seed. -
Method Summary
Modifier and TypeMethodDescriptionprotected int
next
(int bits) Deprecated.boolean
Deprecated.void
nextBytes
(byte[] bytes) Deprecated.double
Deprecated.float
Deprecated.int
nextInt()
Deprecated.int
nextInt
(int n) Deprecated.Returns a pseudorandom, approximately uniformly distributedint
value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.long
nextLong()
Deprecated.long
nextLong
(long n) Deprecated.Returns a pseudorandom uniformly distributedlong
value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.void
setSeed
(long seed) Deprecated.Sets the seed of this generator.void
setState
(long state) Deprecated.Sets the state of this generator.Methods inherited from class java.util.Random
doubles, doubles, doubles, doubles, ints, ints, ints, ints, longs, longs, longs, longs, nextGaussian
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods inherited from interface java.util.random.RandomGenerator
isDeprecated, nextDouble, nextDouble, nextExponential, nextFloat, nextFloat, nextGaussian, nextInt, nextLong
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Constructor Details
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XorShift64StarRandom
public XorShift64StarRandom()Deprecated.Creates a new generator seeded usingUtil.randomSeed()
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XorShift64StarRandom
public XorShift64StarRandom(long seed) Deprecated.Creates a new generator using a given seed.- Parameters:
seed
- a nonzero seed for the generator (if zero, the generator will be seeded withLong.MIN_VALUE
).
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Method Details
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next
protected int next(int bits) Deprecated. -
nextLong
public long nextLong()Deprecated. -
nextInt
public int nextInt()Deprecated. -
nextInt
public int nextInt(int n) Deprecated.Returns a pseudorandom, approximately uniformly distributedint
value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.The hedge “approximately” is due to the fact that to be always faster than
ThreadLocalRandom
we return the upper 63 bits ofnextLong()
modulon
instead of usingRandom
's fancy algorithm (whichnextLong(long)
uses though). This choice introduces a bias: the numbers from 0 to 263 modn
are slightly more likely than the other ones. In the worst case, “more likely” means 1.00000000023 times more likely, which is in practice undetectable (actually, due to the abysmally low quality ofRandom
's generator, the result is statistically better in any case thanRandom.nextInt(int)
's) .If for some reason you need truly uniform generation, just use
nextLong(long)
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nextLong
public long nextLong(long n) Deprecated.Returns a pseudorandom uniformly distributedlong
value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence. The algorithm used to generate the value guarantees that the result is uniform, provided that the sequence of 64-bit values produced by this generator is.- Parameters:
n
- the positive bound on the random number to be returned.- Returns:
- the next pseudorandom
long
value between0
(inclusive) andn
(exclusive).
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nextDouble
public double nextDouble()Deprecated.- Specified by:
nextDouble
in interfacejava.util.random.RandomGenerator
- Overrides:
nextDouble
in classRandom
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nextFloat
public float nextFloat()Deprecated. -
nextBoolean
public boolean nextBoolean()Deprecated.- Specified by:
nextBoolean
in interfacejava.util.random.RandomGenerator
- Overrides:
nextBoolean
in classRandom
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nextBytes
public void nextBytes(byte[] bytes) Deprecated. -
setSeed
public void setSeed(long seed) Deprecated.Sets the seed of this generator.The seed will be passed through
HashCommon.murmurHash3(long)
. In this way, if the user passes a small value we will avoid the short irregular transient associated with states with a very small number of bits set.- Overrides:
setSeed
in classRandom
- Parameters:
seed
- a nonzero seed for this generator (if zero, the generator will be seeded withLong.MIN_VALUE
).
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setState
public void setState(long state) Deprecated.Sets the state of this generator.- Parameters:
state
- the new state for this generator (must be nonzero).
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SplitMix64Random
instead.