info.bioinfweb.commons

Class RandomValues

java.lang.Object

info.bioinfweb.commons.RandomValues

public class RandomValues
extends java.lang.Object

Tool class that offers a set of methods generating random numbers and strings or performing random operations on lists.

Author:

Ben Stöver

Constructor Summary

Constructors

Constructor and Description
RandomValues()

Method Summary

Modifier and Type	Method and Description
static <E> void	listSwap(java.util.List<E> list, int count) Swaps the elements of the list to get a random order.
static java.math.BigDecimal	randBigDecimal(java.math.BigDecimal min, java.math.BigDecimal max) Returns an equally distributed random BigDecimal value.
static java.math.BigInteger	randBigInteger(java.math.BigInteger min, java.math.BigInteger max) Returns an equally distributed random BigInteger value.
static java.math.BigInteger	randBigInteger(int numberOfBits)
static java.lang.String	randChars(java.lang.String chars, int length) Generates a string consisting of a random sequence of the specified characters.
static double	randDouble(double min, double max) Returns an equally distributed random double value.
static float	randFloat(float min, float max) Returns an equally distributed random float value.
static java.lang.String	randHexForBits(int numberOfBits)
static java.lang.String	randHexForChars(int length) Returns the string representation of a random hexadecimal value.
static int	randInt(int min, int max) Returns an equally distributed random integer value.
static long	randLong(long min, long max) Returns an equally distributed random long value.

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomValues

public RandomValues()

Method Detail

randInt

public static int randInt(int min,
                          int max)

Returns an equally distributed random integer value.

Parameters:

min - the lower border of the returned value

max - the upper border of the returned value

Returns:

a value that is greater of equal to min and lower than max

randLong

public static long randLong(long min,
                            long max)

Returns an equally distributed random long value.

Parameters:

min - the lower border of the returned value

max - the upper border of the returned value

Returns:

a value that is greater of equal to min and lower than max

randFloat

public static float randFloat(float min,
                              float max)

Returns an equally distributed random float value.

Parameters:

min - the lower border of the returned value

max - the upper border of the returned value

Returns:

a value that is greater of equal to min and lower than max

randDouble

public static double randDouble(double min,
                                double max)

Returns an equally distributed random double value.

Parameters:

min - the lower border of the returned value

max - the upper border of the returned value

Returns:

a value that is greater of equal to min and lower than max

randBigDecimal

public static java.math.BigDecimal randBigDecimal(java.math.BigDecimal min,
                                                  java.math.BigDecimal max)

Returns an equally distributed random BigDecimal value.

Parameters:

min - the lower border of the returned value

max - the upper border of the returned value

Returns:

a value that is greater of equal to min and lower than max

randBigInteger

public static java.math.BigInteger randBigInteger(java.math.BigInteger min,
                                                  java.math.BigInteger max)

Returns an equally distributed random BigInteger value.

Parameters:

min - the lower border of the returned value

max - the upper border of the returned value

Returns:

a value that is greater of equal to min and lower than max

randBigInteger

public static java.math.BigInteger randBigInteger(int numberOfBits)

randHexForBits

public static java.lang.String randHexForBits(int numberOfBits)

randHexForChars

public static java.lang.String randHexForChars(int length)

Returns the string representation of a random hexadecimal value.

Parameters:

length -

Returns:

randChars

public static java.lang.String randChars(java.lang.String chars,
                                         int length)

Generates a string consisting of a random sequence of the specified characters.

Each character contained in chars can be selected with equal probability for each position of the returned string. One character may also occur several times in the same return value.

Parameters:

chars - a string containing the set of characters that are allowed elements for the returned character sequence

length - the number of characters the returned string shall have

Returns:

a random string with the specified length

listSwap

public static <E> void listSwap(java.util.List<E> list,
                                int count)

Swaps the elements of the list to get a random order.

This method is only efficient for lists that allow random access.

Parameters:

list - the list to be reordered

count - the number of swaps to perform