org.apache.commons.lang.math
Class JVMRandom

java.lang.Object
  java.util.Random
      org.apache.commons.lang.math.JVMRandom

All Implemented Interfaces:

Serializable

public final class JVMRandom
extends Random

JVMRandom is a wrapper that supports all possible Random methods via the Math.random() method and its system-wide Random object.

It does this to allow for a Random class in which the seed is shared between all members of the class - a better name would have been SharedSeedRandom.

N.B. the current implementation overrides the methods Random.nextInt(int) and Random.nextLong() to produce positive numbers ranging from 0 (inclusive) to MAX_VALUE (exclusive).

Since:

2.0

Version:

$Id: JVMRandom.java 911986 2010-02-19 21:19:05Z niallp $

See Also:

Serialized Form

Constructor Summary

JVMRandom()
Constructs a new instance.

Method Summary

boolean	nextBoolean() Returns the next pseudorandom, uniformly distributed boolean value from the Math.random() sequence.
void	nextBytes(byte[] byteArray) Unsupported in 2.0.
double	nextDouble() Synonymous to the Math.random() call.
float	nextFloat() Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from the Math.random() sequence.
double	nextGaussian() Unsupported in 2.0.
int	nextInt() Returns the next pseudorandom, uniformly distributed int value from the Math.random() sequence.
int	nextInt(int n) Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), from the Math.random() sequence.
long	nextLong() Returns the next pseudorandom, uniformly distributed long value from the Math.random() sequence.
static long	nextLong(long n) Returns a pseudorandom, uniformly distributed long value between 0 (inclusive) and the specified value (exclusive), from the Math.random() sequence.
void	setSeed(long seed) Unsupported in 2.0.

Methods inherited from class java.util.Random

next

Methods inherited from class java.lang.Object

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

Constructor Detail

JVMRandom

public JVMRandom()

Constructs a new instance.

Method Detail

setSeed

public void setSeed(long seed)

Unsupported in 2.0.

Overrides:

setSeed in class Random

Parameters:

seed - ignored

Throws:

UnsupportedOperationException

nextGaussian

public double nextGaussian()

Unsupported in 2.0.

Overrides:

nextGaussian in class Random

Returns:

Nothing, this method always throws an UnsupportedOperationException.

Throws:

UnsupportedOperationException

nextBytes

public void nextBytes(byte[] byteArray)

Unsupported in 2.0.

Overrides:

nextBytes in class Random

Parameters:

byteArray - ignored

Throws:

UnsupportedOperationException

nextInt

public int nextInt()

Returns the next pseudorandom, uniformly distributed int value from the Math.random() sequence.

Identical to nextInt(Integer.MAX_VALUE)

N.B. All values are >= 0.

Overrides:

nextInt in class Random

Returns:

the random int

nextInt

public int nextInt(int n)

Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), from the Math.random() sequence.

Overrides:

nextInt in class Random

Parameters:

n - the specified exclusive max-value

Returns:

the random int

Throws:

IllegalArgumentException - when n <= 0

nextLong

public long nextLong()

Returns the next pseudorandom, uniformly distributed long value from the Math.random() sequence.

Identical to nextLong(Long.MAX_VALUE)

N.B. All values are >= 0.

Overrides:

nextLong in class Random

Returns:

the random long

nextLong

public static long nextLong(long n)

Returns a pseudorandom, uniformly distributed long value between 0 (inclusive) and the specified value (exclusive), from the Math.random() sequence.

Parameters:

n - the specified exclusive max-value

Returns:

the random long

Throws:

IllegalArgumentException - when n <= 0

nextBoolean

public boolean nextBoolean()

Returns the next pseudorandom, uniformly distributed boolean value from the Math.random() sequence.

Overrides:

nextBoolean in class Random

Returns:

the random boolean

nextFloat

public float nextFloat()

Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from the Math.random() sequence.

Overrides:

nextFloat in class Random

Returns:

the random float

nextDouble

public double nextDouble()

Synonymous to the Math.random() call.

Overrides:

nextDouble in class Random

Returns:

the random double