Working with sun.misc.Unsafe: How to allocate, store, and view information

Main.kt

package org.frontear

fun main() {
    val unsafe = SunUtils.getUnsafe()!!
    val str = "Hello World"
    val int = Int.MAX_VALUE
    val address = unsafe.allocateMemory((Int.SIZE_BYTES + Char.SIZE_BYTES * str.length).toLong()) // allocate enough memory for our objects. Notice how we don't allocate for the \0 in strings, as we don't need it in this case, but might in other cases
    unsafe.putInt(address, int) // we don't need to offset, since the address is starting from it's beginning point
    for (i in 0 until str.length) {
        val char = str[i]
        unsafe.putChar((address + Int.SIZE_BYTES.toLong()) + (Char.SIZE_BYTES * i).toLong(), char) // offset by the int + whatever character we are on.
    }

    println(unsafe.getInt(address)) // we once again do not need to offset by the int size
    for (i in 0 until str.length) {
        print(unsafe.getChar((address + Int.SIZE_BYTES.toLong()) + (Char.SIZE_BYTES * i).toLong())) // offset and read all characters from the block of memory
    }

    unsafe.freeMemory(address) // this is considered good practice. Although it does very little to keep it here, since when the program ends, the kernel will recollect the memory, however it's important in other programs, so get used to it
}

SunUtils.java

package org.frontear.utils;

import sun.misc.Unsafe;

import java.lang.reflect.Field;

public class SunUtils {
    private SunUtils() {
        throw new UnsupportedOperationException(String.format("Cannot construct %s", SunUtils.class.getSimpleName()));
    }

    private static Unsafe unsafe;

    static {
        try {
            final Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");
            theUnsafe.setAccessible(true);
            unsafe = (Unsafe) theUnsafe.get(null);
        }
        catch (IllegalAccessException | NoSuchFieldException e) {
            throw new Error(); // bad bad
        }
    }

    public static Unsafe getUnsafe() {
        return unsafe;
    }
}