de.florianmichael.rclasses.common

Class RandomUtils

java.lang.Object

de.florianmichael.rclasses.common.RandomUtils

public class RandomUtils
extends java.lang.Object

This class contains some useful methods for generating random numbers.

Field Summary

Fields

Modifier and Type	Field and Description
static java.util.concurrent.ThreadLocalRandom	MAIN_THREAD_RANDOM
static java.util.Random	RANDOM
static java.security.SecureRandom	SECURE_RANDOM

Constructor Summary

Constructors

Constructor and Description
RandomUtils()

Method Summary

Modifier and Type	Method and Description
static boolean	randomBoolean()
static byte	randomByte(byte min, byte max)
static byte[]	randomBytes(int length)
static byte[]	randomBytes(int minLength, int maxLength)
static char	randomChar(char min, char max)
static double	randomDouble(double min, double max)
static <T> T	randomElement(java.util.List<T> list)
static <T> T	randomElement(T[] array)
static float	randomFloat(float min, float max)
static int	randomInt(int min, int max)
static long	randomLong(long min, long max)
static short	randomShort(short min, short max)
static java.lang.String	randomString(int length, boolean lowercase, boolean uppercase, boolean number, boolean special) Generates a random string with the specified length and characters.
static java.lang.String	randomString(int minLength, int maxLength, boolean lowercase, boolean uppercase, boolean number, boolean special) Generates a random string with the specified length and characters.

Methods inherited from class java.lang.Object

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

Field Detail

RANDOM

public static final java.util.Random RANDOM

SECURE_RANDOM

public static final java.security.SecureRandom SECURE_RANDOM

MAIN_THREAD_RANDOM

public static final java.util.concurrent.ThreadLocalRandom MAIN_THREAD_RANDOM

Constructor Detail

RandomUtils

public RandomUtils()

Method Detail

randomInt

public static int randomInt(int min,
                            int max)

Parameters:

min - The minimum value.

max - The maximum value.

Returns:

A random integer between min (inclusive) and max (exclusive).

randomDouble

public static double randomDouble(double min,
                                  double max)

Parameters:

min - The minimum value.

max - The maximum value.

Returns:

A random double between min (inclusive) and max (exclusive).

randomFloat

public static float randomFloat(float min,
                                float max)

Parameters:

min - The minimum value.

max - The maximum value.

Returns:

A random float between min (inclusive) and max (exclusive).

randomLong

public static long randomLong(long min,
                              long max)

Parameters:

min - The minimum value.

max - The maximum value.

Returns:

A random long between min (inclusive) and max (exclusive).

randomShort

public static short randomShort(short min,
                                short max)

Parameters:

min - The minimum value.

max - The maximum value.

Returns:

A random short between min (inclusive) and max (exclusive).

randomByte

public static byte randomByte(byte min,
                              byte max)

Parameters:

min - The minimum value.

max - The maximum value.

Returns:

A random byte between min (inclusive) and max (exclusive).

randomChar

public static char randomChar(char min,
                              char max)

Parameters:

min - The minimum value.

max - The maximum value.

Returns:

A random char between min (inclusive) and max (exclusive).

randomBoolean

public static boolean randomBoolean()

Returns:

A random boolean (either true or false).

randomElement

public static <T> T randomElement(T[] array)

Type Parameters:

T - The type of the array.

Parameters:

array - The array to get the random element from.

Returns:

A random element from the given array.

randomElement

public static <T> T randomElement(java.util.List<T> list)

Type Parameters:

T - The type of the list.

Parameters:

list - The list to get the random element from.

Returns:

A random element from the given list.

randomBytes

public static byte[] randomBytes(int length)

Parameters:

length - The length of the byte array.

Returns:

A random byte array with the specified length.

randomBytes

public static byte[] randomBytes(int minLength,
                                 int maxLength)

Parameters:

minLength - The minimum length of the byte array.

maxLength - The maximum length of the byte array.

Returns:

A random byte array with a random length between minLength (inclusive) and maxLength (exclusive).

randomString

public static java.lang.String randomString(int minLength,
                                            int maxLength,
                                            boolean lowercase,
                                            boolean uppercase,
                                            boolean number,
                                            boolean special)

Generates a random string with the specified length and characters. If all the boolean parameters are false, lowercase will be set to true.

Parameters:

minLength - The minimum length of the string.

maxLength - The maximum length of the string.

lowercase - Whether to include lowercase characters.

uppercase - Whether to include uppercase characters.

number - Whether to include number characters.

special - Whether to include special characters.

Returns:

A random string with a random length between minLength (inclusive) and maxLength (exclusive) and characters.

randomString

public static java.lang.String randomString(int length,
                                            boolean lowercase,
                                            boolean uppercase,
                                            boolean number,
                                            boolean special)

Generates a random string with the specified length and characters. If all the boolean parameters are false, lowercase will be set to true.

Parameters:

length - The length of the string.

lowercase - Whether to include lowercase characters.

uppercase - Whether to include uppercase characters.

number - Whether to include number characters.

special - Whether to include special characters.

Returns:

A random string with the specified length and characters.