import java.util.*

fun box(): String {
    val list = ArrayList(Arrays.asList(3, 2, 4, 8, 1, 5))
    val expected = ArrayList(Arrays.asList(8, 5, 4, 3, 2, 1))

    val f = { a: Int, b: Int -> b - a }
    JavaClass.sortIntList(list, f)
    return if (list == expected) "OK" else list.toString()
}