org.apache.commons.lang.math

Class RandomUtils


public class RandomUtils
extends Object

RandomUtils is a wrapper that supports all possible Random methods via the Math.random() method and its system-wide Random object.
Version:
$Id: RandomUtils.java 155423 2005-02-26 13:08:30Z dirkv $
Authors:
Henri Yandell
Gary D. Gregory
Since:
2.0

Field Summary

static Random
JVM_RANDOM
An instance of JVMRandom.

Method Summary

static boolean
nextBoolean()
Returns the next pseudorandom, uniformly distributed boolean value from the Math.random() sequence.
static boolean
nextBoolean(Random random)
Returns the next pseudorandom, uniformly distributed boolean value from the given random sequence.
static double
nextDouble()
Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from the Math.random() sequence.
static double
nextDouble(Random random)
Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from the given Random sequence.
static float
nextFloat()
Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from the Math.random() sequence.
static float
nextFloat(Random random)
Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from the given Random sequence.
static int
nextInt()
Returns the next pseudorandom, uniformly distributed int value from the Math.random() sequence.
static int
nextInt(Random random)
Returns the next pseudorandom, uniformly distributed int value from the given random sequence.
static int
nextInt(Random random, int n)
Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), from the given Random sequence.
static int
nextInt(int n)
Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), from the Math.random() sequence.
static long
nextLong()
Returns the next pseudorandom, uniformly distributed long value from the Math.random() sequence.
static long
nextLong(Random random)
Returns the next pseudorandom, uniformly distributed long value from the given Random sequence.

Field Details

JVM_RANDOM

public static final Random JVM_RANDOM

Method Details

nextBoolean

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

nextBoolean

public static boolean nextBoolean(Random random)
Returns the next pseudorandom, uniformly distributed boolean value from the given random sequence.
Parameters:
random - the Random sequence generator.
Returns:
the random boolean

nextDouble

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

nextDouble

public static double nextDouble(Random random)
Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from the given Random sequence.
Parameters:
random - the Random sequence generator.
Returns:
the random double

nextFloat

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

nextFloat

public static float nextFloat(Random random)
Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from the given Random sequence.
Parameters:
random - the Random sequence generator.
Returns:
the random float

nextInt

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

nextInt

public static int nextInt(Random random)
Returns the next pseudorandom, uniformly distributed int value from the given random sequence.
Parameters:
random - the Random sequence generator.
Returns:
the random int

nextInt

public static int nextInt(Random random,
                          int n)
Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), from the given Random sequence.
Parameters:
random - the Random sequence generator.
n - the specified exclusive max-value
Returns:
the random int

nextInt

public static int nextInt(int n)
Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), from the Math.random() sequence.
Parameters:
n - the specified exclusive max-value
Returns:
the random int

nextLong

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

nextLong

public static long nextLong(Random random)
Returns the next pseudorandom, uniformly distributed long value from the given Random sequence.
Parameters:
random - the Random sequence generator.
Returns:
the random long

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