ISAACRandom (Apache Commons Math 3.6.1 API)

java.lang.Object
- org.apache.commons.math3.random.BitsStreamGenerator
- - org.apache.commons.math3.random.ISAACRandom

All Implemented Interfaces:

Serializable, RandomGenerator
```
public class ISAACRandom
extends BitsStreamGenerator
implements Serializable
```
ISAAC: a fast cryptographic pseudo-random number generator
ISAAC (Indirection, Shift, Accumulate, Add, and Count) generates 32-bit random numbers. ISAAC has been designed to be cryptographically secure and is inspired by RC4. Cycles are guaranteed to be at least 2⁴⁰ values long, and they are 2⁸²⁹⁵ values long on average. The results are uniformly distributed, unbiased, and unpredictable unless you know the seed.
This code is based (with minor changes and improvements) on the original implementation of the algorithm by Bob Jenkins.

Since:

3.0

See Also:
Serialized Form

Constructor Summary

Constructors
Constructor and Description
`ISAACRandom()` Creates a new ISAAC random number generator.
`ISAACRandom(int[] seed)` Creates a new ISAAC random number generator using an int array seed.
`ISAACRandom(long seed)` Creates a new ISAAC random number generator using a single long seed.

Method Summary

Methods
Modifier and Type	Method and Description
`protected int`	`next(int bits)` Generate next pseudorandom number.
`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 org.apache.commons.math3.random.BitsStreamGenerator
clear, nextBoolean, nextBytes, nextBytes, nextDouble, nextFloat, nextGaussian, nextInt, nextInt, nextLong, nextLong

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ISAACRandom
```
public ISAACRandom()
```
    Creates a new ISAAC random number generator.
    The instance is initialized using a combination of the current time and system hash code of the instance as the seed.
  - ISAACRandom
```
public ISAACRandom(long seed)
```
    Creates a new ISAAC random number generator using a single long seed.
    
    Parameters:
    seed - Initial seed.
  - ISAACRandom
```
public ISAACRandom(int[] seed)
```
    Creates a new ISAAC random number generator using an int array seed.
    
    Parameters:
    seed - Initial seed. If null, the seed will be related to the current time.
- Method Detail
  - 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
    
    Specified by:
    
    setSeed in class BitsStreamGenerator
    
    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
    
    Specified by:
    
    setSeed in class BitsStreamGenerator
    
    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
    
    Specified by:
    
    setSeed in class BitsStreamGenerator
    
    Parameters:
    seed - the seed value
  - next
```
protected int next(int bits)
```
    Generate next pseudorandom number.
    This method is the core generation algorithm. It is used by all the public generation methods for the various primitive types BitsStreamGenerator.nextBoolean(), BitsStreamGenerator.nextBytes(byte[]), BitsStreamGenerator.nextDouble(), BitsStreamGenerator.nextFloat(), BitsStreamGenerator.nextGaussian(), BitsStreamGenerator.nextInt(), BitsStreamGenerator.next(int) and BitsStreamGenerator.nextLong().
    
    Specified by:
    
    next in class BitsStreamGenerator
    
    Parameters:
    bits - number of random bits to produce
    
    Returns:
    random bits generated

Class ISAACRandom

Constructor Summary

Method Summary

Methods inherited from class org.apache.commons.math3.random.BitsStreamGenerator

Methods inherited from class java.lang.Object

Constructor Detail

ISAACRandom

ISAACRandom

ISAACRandom

Method Detail

setSeed

setSeed

setSeed

next