openbook.util

Class Randomizer

java.lang.Object

openbook.util.Randomizer

public class Randomizer
extends Object

A set of static utility functions for simulating pseudo-randomness.

Author:

Pinaki Poddar

Constructor Summary

Constructors

Constructor and Description
Randomizer()

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	probability(double p) Returns true with a probability of p.
static double	random(double min, double max)
static int	random(int n) Picks a random number between 0 (inclusive) and N (exclusive).
static int	random(int min, int max) Picks a uniformly distributed random integer within the given range.
static String	randomString(int... segments) Generates a random alphanumeric String with each segment separated by a dash.
static <T> T	selectRandom(List<T> list) Picks a random element from the given list.
static <T> List<T>	selectRandom(List<T> list, int n) Selects n elements randomly from the given list.

Methods inherited from class java.lang.Object

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

Constructor Detail

Randomizer

public Randomizer()

Method Detail

probability

public static boolean probability(double p)

Returns true with a probability of p.

random

public static int random(int n)

Picks a random number between 0 (inclusive) and N (exclusive).

random

public static int random(int min,
         int max)

Picks a uniformly distributed random integer within the given range.

random

public static double random(double min,
            double max)

randomString

public static String randomString(int... segments)

Generates a random alphanumeric String with each segment separated by a dash.

selectRandom

public static <T> T selectRandom(List<T> list)

Picks a random element from the given list.

selectRandom

public static <T> List<T> selectRandom(List<T> list,
                       int n)

Selects n elements randomly from the given list.