Package org.apache.commons.math.random

Class RandomAdaptor

java.lang.Object

java.util.Random

org.apache.commons.math.random.RandomAdaptor

All Implemented Interfaces:

java.io.Serializable, RandomGenerator

public class RandomAdaptor
extends java.util.Random
implements RandomGenerator

Extension of java.util.Random wrapping a RandomGenerator.

Since:

1.1

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
RandomAdaptor(RandomGenerator randomGenerator)	Construct a RandomAdaptor wrapping the supplied RandomGenerator.

Method Summary

Modifier and Type	Method	Description
static java.util.Random	createAdaptor(RandomGenerator randomGenerator)	Factory method to create a Random using the supplied RandomGenerator.
boolean	nextBoolean()	Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence.
void	nextBytes(byte[] bytes)	Generates random bytes and places them into a user-supplied byte array.
double	nextDouble()	Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.
float	nextFloat()	Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.
double	nextGaussian()	Returns the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence.
int	nextInt()	Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence.
int	nextInt(int n)	Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.
long	nextLong()	Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence.
void	setSeed(int seed)	Sets the seed of the underlying random number generator using an int seed.
void	setSeed(int[] seed)	Sets the seed of the underlying random number generator using an int array seed.
void	setSeed(long seed)	Sets the seed of the underlying random number generator using a long seed.

Methods inherited from class java.util.Random

doubles, doubles, doubles, doubles, ints, ints, ints, ints, longs, longs, longs, longs

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RandomAdaptor

public RandomAdaptor(RandomGenerator randomGenerator)

Construct a RandomAdaptor wrapping the supplied RandomGenerator.

Parameters:

randomGenerator - the wrapped generator

Method Detail

createAdaptor

public static java.util.Random createAdaptor(RandomGenerator randomGenerator)

Factory method to create a Random using the supplied RandomGenerator.

Parameters:

randomGenerator - wrapped RandomGenerator instance

Returns:

a Random instance wrapping the RandomGenerator

nextBoolean

public boolean nextBoolean()

Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence.

Specified by:

nextBoolean in interface RandomGenerator

Overrides:

nextBoolean in class java.util.Random

Returns:

the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence

nextBytes

public void nextBytes(byte[] bytes)

Generates random bytes and places them into a user-supplied byte array. The number of random bytes produced is equal to the length of the byte array.

Specified by:

nextBytes in interface RandomGenerator

Overrides:

nextBytes in class java.util.Random

Parameters:

bytes - the non-null byte array in which to put the random bytes

nextDouble

public double nextDouble()

Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.

Specified by:

nextDouble in interface RandomGenerator

Overrides:

nextDouble in class java.util.Random

Returns:

the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence

nextFloat

public float nextFloat()

Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.

Specified by:

nextFloat in interface RandomGenerator

Overrides:

nextFloat in class java.util.Random

Returns:

the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence

nextGaussian

public double nextGaussian()

Returns the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence.

Specified by:

nextGaussian in interface RandomGenerator

Overrides:

nextGaussian in class java.util.Random

Returns:

the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence

nextInt

public int nextInt()

Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence. All 2³² possible int values should be produced with (approximately) equal probability.

Specified by:

nextInt in interface RandomGenerator

Overrides:

nextInt in class java.util.Random

Returns:

the next pseudorandom, uniformly distributed int value from this random number generator's sequence

nextInt

public int nextInt(int n)

Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.

Specified by:

nextInt in interface RandomGenerator

Overrides:

nextInt in class java.util.Random

Parameters:

n - the bound on the random number to be returned. Must be positive.

Returns:

a pseudorandom, uniformly distributed int value between 0 (inclusive) and n (exclusive).

Throws:

java.lang.IllegalArgumentException - if n is not positive.

nextLong

public long nextLong()

Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence. All 2⁶⁴ possible long values should be produced with (approximately) equal probability.

Specified by:

nextLong in interface RandomGenerator

Overrides:

nextLong in class java.util.Random

Returns:

the next pseudorandom, uniformly distributed long value from this random number generator's sequence

setSeed

public void setSeed(int seed)

Sets the seed of the underlying random number generator using an int seed.

Sequences of values generated starting with the same seeds should be identical.

Specified by:

setSeed in interface RandomGenerator

Parameters:

seed - the seed value

setSeed

public void setSeed(int[] seed)

Sets the seed of the underlying random number generator using an int array seed.

Sequences of values generated starting with the same seeds should be identical.

Specified by:

setSeed in interface RandomGenerator

Parameters:

seed - the seed value

setSeed

public void setSeed(long seed)

Sets the seed of the underlying random number generator using a long seed.

Sequences of values generated starting with the same seeds should be identical.

Specified by:

setSeed in interface RandomGenerator

Overrides:

setSeed in class java.util.Random

Parameters:

seed - the seed value