How do I convert a `ByteArray` to `byte[]` so that...

# getting-started

[Kirill Grouchnikov]

How do I convert a ByteArray to byte[] so that I can pass it to a Java method that accepts the "traditional" byte arrays?

[nschulzke]

You shouldn't need to do any conversion. A ByteArray is Kotlin is represented as a byte[] on the JVM, so you can pass it where one is required. This works for me:

import java.util.Arrays

val byteArray = ByteArray(10)
Arrays.fill(byteArray, 2)

for (byte in byteArray) {
    print(byte)
}

[Kirill Grouchnikov]

Ah, that makes sense. I thought it needed an explicit conversion.

[ephemient]

Array<T> is Java T[] as well. which leads to the "fun" fact that, like Java,

listOf(1)::class == listOf("a")::class // because erasure
arrayOf(1)::class != arrayOf("a")::class // because arrays of different element types have different representations