public class CMWC4096RNG extends Random implements RepeatableRNG
A Java version of George Marsaglia's
Complementary
Multiply With Carry (CMWC) RNG.
This is a very fast PRNG with an extremely long period (2^131104). It should be used
in preference to the MersenneTwisterRNG
when a very long period is required.
One potential drawback of this RNG is that it requires significantly more seed data than the other RNGs provided by Uncommons Maths. It requires just over 16 kilobytes, which may be a problem if your are obtaining seed data from a slow or limited entropy source. In contrast, the Mersenne Twister requires only 128 bits of seed data.
NOTE: Because instances of this class require 16-kilobyte seeds, it is not
possible to seed this RNG using the Random.setSeed(long)
method inherited
from Random
. Calls to this method will have no effect.
Instead the seed must be set by a constructor.
Constructor and Description |
---|
CMWC4096RNG()
Creates a new RNG and seeds it using the default seeding strategy.
|
CMWC4096RNG(byte[] seed)
Creates an RNG and seeds it with the specified seed data.
|
CMWC4096RNG(SeedGenerator seedGenerator)
Seed the RNG using the provided seed generation strategy.
|
Modifier and Type | Method and Description |
---|---|
byte[] |
getSeed() |
protected int |
next(int bits) |
public CMWC4096RNG()
public CMWC4096RNG(SeedGenerator seedGenerator) throws SeedException
seedGenerator
- The seed generation strategy that will provide
the seed value for this RNG.SeedException
- If there is a problem generating a seed.public CMWC4096RNG(byte[] seed)
seed
- The seed data used to initialise the RNG.public byte[] getSeed()
getSeed
in interface RepeatableRNG
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