kotlin-stdlib/kotlin.random/Random/Default/nextBytes

nextBytes

open override fun nextBytes(array: ByteArray): ByteArray

Fills the specified byte array with random bytes and returns it.

Return

array filled with random bytes.

Samples

import samples.*
import kotlin.math.sin
import kotlin.random.Random
import kotlin.test.assertTrue
fun main() { 
   //sampleStart 
   val bytes = ByteArray(4)
assertPrints(bytes.contentToString(), "[0, 0, 0, 0]")

Random.nextBytes(bytes, 1, 3)
// second and third bytes are generated, rest unchanged
println(bytes.contentToString())

Random.nextBytes(bytes)
// all bytes are newly generated
println(bytes.contentToString())

val newBytes = Random.nextBytes(5)
// a new byte array filled with random values
println(newBytes.contentToString()) 
   //sampleEnd
}

open override fun nextBytes(size: Int): ByteArray

Creates a byte array of the specified size, filled with random bytes.

Samples

import samples.*
import kotlin.math.sin
import kotlin.random.Random
import kotlin.test.assertTrue
fun main() { 
   //sampleStart 
   val bytes = ByteArray(4)
assertPrints(bytes.contentToString(), "[0, 0, 0, 0]")

Random.nextBytes(bytes, 1, 3)
// second and third bytes are generated, rest unchanged
println(bytes.contentToString())

Random.nextBytes(bytes)
// all bytes are newly generated
println(bytes.contentToString())

val newBytes = Random.nextBytes(5)
// a new byte array filled with random values
println(newBytes.contentToString()) 
   //sampleEnd
}

open override fun nextBytes(array: ByteArray, fromIndex: Int, toIndex: Int): ByteArray

Fills a subrange of the specified byte array starting from fromIndex inclusive and ending toIndex exclusive with random bytes.

Return

array with the subrange filled with random bytes.

Samples

import samples.*
import kotlin.math.sin
import kotlin.random.Random
import kotlin.test.assertTrue
fun main() { 
   //sampleStart 
   val bytes = ByteArray(4)
assertPrints(bytes.contentToString(), "[0, 0, 0, 0]")

Random.nextBytes(bytes, 1, 3)
// second and third bytes are generated, rest unchanged
println(bytes.contentToString())

Random.nextBytes(bytes)
// all bytes are newly generated
println(bytes.contentToString())

val newBytes = Random.nextBytes(5)
// a new byte array filled with random values
println(newBytes.contentToString()) 
   //sampleEnd
}