How to cast Int to Char in Kotlin

Question

With Java primitives it was easy to cast char code to symbol

int i = 65;
char c = (char) i; // 'A'

How to do the same with Kotlin?

Answer 1

First convert the Int to ByteArray (with the correct byte order) using a ByteBuffer, then use the appropriate String constructor.

import java.nio.ByteBuffer
import java.nio.ByteOrder
import java.nio.charset.Charset

fun intToByteArray(n: Int, byteOrder: ByteOrder) =
    ByteBuffer.allocate(4).order(byteOrder).putInt(n).array()

fun byteArrayToUnicode(ba: ByteArray, charSet: Charset) =
    String(ba, charSet)

fun intToUniCode(n: Int, byteOrder: ByteOrder, charSet: Charset) =
    byteArrayToUnicode(intToByteArray(n, byteOrder), charSet)

fun test() {
    val charSet = Charset.forName("UTF-32BE")
    val n = 0x000000f7 // division sign (U+00F7)
    val s = intToUniCode(n, ByteOrder.BIG_ENDIAN, charSet)
    println(s)
}

Answer 2

Use the int.toChar() function to do it.