Package net.minecraft.util.math.random

Interface Random

All Known Subinterfaces:

BaseRandom

All Known Implementing Classes:

CheckedRandom, ChunkRandom, LocalRandom, ThreadSafeRandom, Xoroshiro128PlusPlusRandom

public interface Random

A reimplementation of Random.

There are four built-in implementations, three based on the classic Java algorithm and one using Xoroshiro128++ algorithm.

• LocalRandom: Silently breaks when used concurrently. Based on Random.
• CheckedRandom: Throws when used concurrently. Based on Random.
• ThreadSafeRandom: Blocks the thread when used concurrently. Based on Random.
• Xoroshiro128PlusPlusRandom: Silently breaks when used concurrently. Implements the Xoroshiro128++ algorithm.

See Also:

• java.util.random

Implementation Note:

Note that due to MC-239059, this is not an exact reimplementation of the Java random number generator algorithm.

Mappings:

Namespace	Name
official	alu
intermediary	net/minecraft/class_5819
named	net/minecraft/util/math/random/Random

Field Summary

Fields

Modifier and Type	Field	Description
static final double	field_38930	Deprecated.

Method Summary

Modifier and Type	Method	Description
static Random	create()	Returns a random.
static Random	create(long seed)	Returns a random with the given seed.
static Random	createLocal()	Returns a random split from the thread local random.
static Random	createThreadSafe()	Deprecated. This one is hard to ensure deterministic behavior compared to the non-thread-safe one.
default int	nextBetween(int min, int max)
default int	nextBetweenExclusive(int min, int max)
boolean	nextBoolean()
double	nextDouble()
float	nextFloat()
double	nextGaussian()
int	nextInt()
int	nextInt(int bound)
long	nextLong()
RandomSplitter	nextSplitter()
default double	nextTriangular(double mode, double deviation)	Returns a random double between mode - deviation and mode + deviation (both inclusive) with mode mode.
void	setSeed(long seed)
default void	skip(int count)
Random	split()

Field Details

field_38930

@Deprecated
static final double field_38930

Deprecated.

See Also:

• Constant Field Values

Mappings:

Namespace	Name	Mixin selector
official	a	Lalu;a:D
intermediary	field_38930	Lnet/minecraft/class_5819;field_38930:D
named	field_38930	Lnet/minecraft/util/math/random/Random;field_38930:D

Method Details

create

static Random create()

Returns a random. The returned random actively detects concurrent usage and fails on detection.

Returns:

a random

Mappings:

Namespace	Name	Mixin selector
official	a	Lalu;a()Lalu;
intermediary	method_43047	Lnet/minecraft/class_5819;method_43047()Lnet/minecraft/class_5819;
named	create	Lnet/minecraft/util/math/random/Random;create()Lnet/minecraft/util/math/random/Random;

createThreadSafe

@Deprecated
static Random createThreadSafe()

Deprecated.

This one is hard to ensure deterministic behavior compared to the non-thread-safe one.

Returns a random, suitable for multithreaded scenarios.

Returns:

a random, suitable for multithreaded scenarios

Mappings:

Namespace	Name	Mixin selector
official	b	Lalu;b()Lalu;
intermediary	method_43050	Lnet/minecraft/class_5819;method_43050()Lnet/minecraft/class_5819;
named	createThreadSafe	Lnet/minecraft/util/math/random/Random;createThreadSafe()Lnet/minecraft/util/math/random/Random;

create

static Random create(long seed)

Returns a random with the given seed. The returned random actively detects concurrent usage and fails on detection.

Returns:

a random with the given seed

Mappings:

Namespace	Name	Mixin selector
official	a	Lalu;a(J)Lalu;
intermediary	method_43049	Lnet/minecraft/class_5819;method_43049(J)Lnet/minecraft/class_5819;
named	create	Lnet/minecraft/util/math/random/Random;create(J)Lnet/minecraft/util/math/random/Random;

createLocal

static Random createLocal()

Returns a random split from the thread local random. Users must ensure this random is not used concurrently.

Returns:

a random split from the thread local random

Mappings:

Namespace	Name	Mixin selector
official	c	Lalu;c()Lalu;
intermediary	method_43053	Lnet/minecraft/class_5819;method_43053()Lnet/minecraft/class_5819;
named	createLocal	Lnet/minecraft/util/math/random/Random;createLocal()Lnet/minecraft/util/math/random/Random;

split

Random split()

Mappings:

Namespace	Name	Mixin selector
official	d	Lalu;d()Lalu;
intermediary	method_38420	Lnet/minecraft/class_5819;method_38420()Lnet/minecraft/class_5819;
named	split	Lnet/minecraft/util/math/random/Random;split()Lnet/minecraft/util/math/random/Random;

nextSplitter

RandomSplitter nextSplitter()

Mappings:

Namespace	Name	Mixin selector
official	e	Lalu;e()Ldag;
intermediary	method_38421	Lnet/minecraft/class_5819;method_38421()Lnet/minecraft/class_6574;
named	nextSplitter	Lnet/minecraft/util/math/random/Random;nextSplitter()Lnet/minecraft/util/math/random/RandomSplitter;

setSeed

void setSeed(long seed)

Mappings:

Namespace	Name	Mixin selector
official	b	Lalu;b(J)V
intermediary	method_43052	Lnet/minecraft/class_5819;method_43052(J)V
named	setSeed	Lnet/minecraft/util/math/random/Random;setSeed(J)V

nextInt

int nextInt()

Mappings:

Namespace	Name	Mixin selector
official	f	Lalu;f()I
intermediary	method_43054	Lnet/minecraft/class_5819;method_43054()I
named	nextInt	Lnet/minecraft/util/math/random/Random;nextInt()I

nextInt

int nextInt(int bound)

Mappings:

Namespace	Name	Mixin selector
official	a	Lalu;a(I)I
intermediary	method_43048	Lnet/minecraft/class_5819;method_43048(I)I
named	nextInt	Lnet/minecraft/util/math/random/Random;nextInt(I)I

nextBetween

default int nextBetween(int min,
 int max)

Mappings:

Namespace	Name	Mixin selector
official	a	Lalu;a(II)I
intermediary	method_39332	Lnet/minecraft/class_5819;method_39332(II)I
named	nextBetween	Lnet/minecraft/util/math/random/Random;nextBetween(II)I

nextLong

long nextLong()

Mappings:

Namespace	Name	Mixin selector
official	g	Lalu;g()J
intermediary	method_43055	Lnet/minecraft/class_5819;method_43055()J
named	nextLong	Lnet/minecraft/util/math/random/Random;nextLong()J

nextBoolean

boolean nextBoolean()

Mappings:

Namespace	Name	Mixin selector
official	h	Lalu;h()Z
intermediary	method_43056	Lnet/minecraft/class_5819;method_43056()Z
named	nextBoolean	Lnet/minecraft/util/math/random/Random;nextBoolean()Z

nextFloat

float nextFloat()

Mappings:

Namespace	Name	Mixin selector
official	i	Lalu;i()F
intermediary	method_43057	Lnet/minecraft/class_5819;method_43057()F
named	nextFloat	Lnet/minecraft/util/math/random/Random;nextFloat()F

nextDouble

double nextDouble()

Mappings:

Namespace	Name	Mixin selector
official	j	Lalu;j()D
intermediary	method_43058	Lnet/minecraft/class_5819;method_43058()D
named	nextDouble	Lnet/minecraft/util/math/random/Random;nextDouble()D

nextGaussian

double nextGaussian()

Mappings:

Namespace	Name	Mixin selector
official	k	Lalu;k()D
intermediary	method_43059	Lnet/minecraft/class_5819;method_43059()D
named	nextGaussian	Lnet/minecraft/util/math/random/Random;nextGaussian()D

nextTriangular

default double nextTriangular(double mode,
 double deviation)

Returns a random double between mode - deviation and mode + deviation (both inclusive) with mode mode.

Because the return value follows a symmetric triangular distribution, the distribution's mean and median are equal to mode.

Returns:

a random double between mode - deviation and mode + deviation (both inclusive) with mode mode

Mappings:

Namespace	Name	Mixin selector
official	a	Lalu;a(DD)D
intermediary	method_43385	Lnet/minecraft/class_5819;method_43385(DD)D
named	nextTriangular	Lnet/minecraft/util/math/random/Random;nextTriangular(DD)D

skip

default void skip(int count)

Mappings:

Namespace	Name	Mixin selector
official	b	Lalu;b(I)V
intermediary	method_33650	Lnet/minecraft/class_5819;method_33650(I)V
named	skip	Lnet/minecraft/util/math/random/Random;skip(I)V

nextBetweenExclusive

default int nextBetweenExclusive(int min,
 int max)

Mappings:

Namespace	Name	Mixin selector
official	b	Lalu;b(II)I
intermediary	method_43051	Lnet/minecraft/class_5819;method_43051(II)I
named	nextBetweenExclusive	Lnet/minecraft/util/math/random/Random;nextBetweenExclusive(II)I