weiss.util
Class Random

java.lang.Object
  weiss.util.Random

public class Random
extends java.lang.Object

Constructor Summary

Random()

Random(int initialValue)

Random(long initialValue)

Method Summary

static void	main(java.lang.String[] args)
double	nextDouble() Return a pseudorandom double in the range [0..1) and change the internal state.
int	nextInt() Return a pseudorandom int, and change the internal state.
int	nextInt(int high) Return a pseudorandom int in range [0..high), and change the internal state.
int	nextInt(int low, int high) Return an int in the closed range [low,high], and change the internal state.
long	nextLong() Return a 64-bit long, and change the internal state.
double	nextNegExp(double expectedValue) Return a double using a negative exponential distribution, and change the internal state.
int	nextPoisson(double expectedValue) Return an int using a Poisson distribution, and change the internal state.
static <AnyType> void	permute(AnyType[] a) Randomly rearrange an array.

Methods inherited from class java.lang.Object

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

Constructor Detail

Random

public Random()

Random

public Random(int initialValue)

Random

public Random(long initialValue)

Method Detail

nextInt

public int nextInt()

Return a pseudorandom int, and change the internal state.

Returns:

the pseudorandom int.

nextInt

public int nextInt(int high)

Return a pseudorandom int in range [0..high), and change the internal state.

Returns:

the pseudorandom int.

nextDouble

public double nextDouble()

Return a pseudorandom double in the range [0..1) and change the internal state.

Returns:

the pseudorandom double.

nextInt

public int nextInt(int low,
                   int high)

Return an int in the closed range [low,high], and change the internal state.

Parameters:

low - the minimum value returned.

high - the maximum value returned.

Returns:

the pseudorandom int.

nextLong

public long nextLong()

Return a 64-bit long, and change the internal state. Note that all longs can be generated.

Returns:

the pseudorandom long.

nextPoisson

public int nextPoisson(double expectedValue)

Return an int using a Poisson distribution, and change the internal state.

Parameters:

expectedValue - the mean of the distribution.

Returns:

the pseudorandom int.

nextNegExp

public double nextNegExp(double expectedValue)

Return a double using a negative exponential distribution, and change the internal state.

Parameters:

expectedValue - the mean of the distribution.

Returns:

the pseudorandom double.

permute

public static final <AnyType> void permute(AnyType[] a)

Randomly rearrange an array. The random numbers used depend on the time and day.

Parameters:

a - the array.

main

public static void main(java.lang.String[] args)