abstract class Random
An abstract class that is implemented by random number generator algorithms.
The companion object Random.Default is the default instance of Random.
To get a seeded instance of random generator use Random function.
import kotlin.random.Random
import kotlin.test.assertTrue
fun main(args: Array<String>) {
//sampleStart
val randomValues = List(10) { Random.nextInt(0, 100) }
// prints new sequence every time
println(randomValues)
val nextValues = List(10) { Random.nextInt(0, 100) }
println(nextValues)
println("randomValues != nextValues is ${randomValues != nextValues}") // true
//sampleEnd
}The default random number generator.
companion object Default : Random
An abstract class that is implemented by random number generator algorithms.
Random()
Gets the next random bitCount number of bits.
abstract fun nextBits(bitCount: Int): Int
Gets the next random Boolean value.
open fun nextBoolean(): Boolean
Fills a subrange of the specified byte array starting from fromIndex inclusive and ending toIndex exclusive with random bytes.
open fun nextBytes( array: ByteArray, fromIndex: Int = 0, toIndex: Int = array.size ): ByteArray
Fills the specified byte array with random bytes and returns it.
open fun nextBytes(array: ByteArray): ByteArray
Creates a byte array of the specified size, filled with random bytes.
open fun nextBytes(size: Int): ByteArray
Gets the next random Double value uniformly distributed between 0 (inclusive) and 1 (exclusive).
open fun nextDouble(): Double
Gets the next random non-negative Double from the random number generator less than the specified until bound.
open fun nextDouble(until: Double): Double
Gets the next random Double from the random number generator in the specified range.
open fun nextDouble(from: Double, until: Double): Double
Gets the next random Float value uniformly distributed between 0 (inclusive) and 1 (exclusive).
open fun nextFloat(): Float
Gets the next random Int from the random number generator.
open fun nextInt(): Int
Gets the next random non-negative Int from the random number generator less than the specified until bound.
open fun nextInt(until: Int): Int
Gets the next random Int from the random number generator in the specified range.
open fun nextInt(from: Int, until: Int): Int
Gets the next random Long from the random number generator.
open fun nextLong(): Long
Gets the next random non-negative Long from the random number generator less than the specified until bound.
open fun nextLong(until: Long): Long
Gets the next random Long from the random number generator in the specified range.
open fun nextLong(from: Long, until: Long): Long
Gets the next random bitCount number of bits.
fun nextBits(bitCount: Int): Int
Gets the next random Boolean value.
fun nextBoolean(): Boolean
Fills the specified byte array with random bytes and returns it.
fun nextBytes(array: ByteArray): ByteArray
Creates a byte array of the specified size, filled with random bytes.
fun nextBytes(size: Int): ByteArray
Gets the next random Double value uniformly distributed between 0 (inclusive) and 1 (exclusive).
fun nextDouble(): Double
Gets the next random non-negative Double from the random number generator less than the specified until bound.
fun nextDouble(until: Double): Double
Gets the next random Double from the random number generator in the specified range.
fun nextDouble(from: Double, until: Double): Double
Gets the next random Float value uniformly distributed between 0 (inclusive) and 1 (exclusive).
fun nextFloat(): Float
Gets the next random Int from the random number generator.
fun nextInt(): Int
Gets the next random non-negative Int from the random number generator less than the specified until bound.
fun nextInt(until: Int): Int
Gets the next random Int from the random number generator in the specified range.
fun nextInt(from: Int, until: Int): Int
Gets the next random Long from the random number generator.
fun nextLong(): Long
Gets the next random non-negative Long from the random number generator less than the specified until bound.
fun nextLong(until: Long): Long
Gets the next random Long from the random number generator in the specified range.
fun nextLong(from: Long, until: Long): Long
Creates a java.util.Random instance that uses the specified Kotlin Random generator as a randomness source.
fun Random.asJavaRandom(): Random
Gets the next random Int from the random number generator in the specified range.
fun Random.nextInt(range: IntRange): Int
Gets the next random Long from the random number generator in the specified range.
fun Random.nextLong(range: LongRange): Long
Fills the specified unsigned byte array with random bytes and returns it.
fun Random.nextUBytes(array: UByteArray): UByteArray
Creates an unsigned byte array of the specified size, filled with random bytes.
fun Random.nextUBytes(size: Int): UByteArray
Gets the next random UInt from the random number generator.
fun Random.nextUInt(): UInt
Gets the next random UInt from the random number generator less than the specified until bound.
fun Random.nextUInt(until: UInt): UInt
Gets the next random UInt from the random number generator in the specified range.
fun Random.nextUInt(from: UInt, until: UInt): UInt
Gets the next random ULong from the random number generator.
fun Random.nextULong(): ULong
Gets the next random ULong from the random number generator less than the specified until bound.
fun Random.nextULong(until: ULong): ULong
Gets the next random ULong from the random number generator in the specified range.
fun Random.nextULong(from: ULong, until: ULong): ULong
© 2010–2020 JetBrains s.r.o. and Kotlin Programming Language contributors
Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.random/-random/index.html