full

time_full.kt

import java.util.LinkedList
import java.util.concurrent.TimeUnit
import kotlin.system.measureNanoTime
import kotlin.system.measureTimeMillis
import kotlin.time.ExperimentalTime
import kotlin.time.measureTime
import kotlin.time.measureTimedValue

fun main(args: Array<String>) {
    javaStyle()
    kotlin1()
    kotlin2()
    kotlin3()
}

@OptIn(ExperimentalTime::class)
fun kotlin3() {
    val arrayListValue = measureTimedValue {
        arrayListCode()
    }
    println("ArrayList ook ${arrayListValue.duration.inWholeSeconds} seconds and got ${arrayListValue.value}.")

    val (value,duration) = measureTimedValue { linkedListCode() }
    println("LinkedList took ${duration.inWholeSeconds} seconds and got ${value}.")


}

@OptIn(ExperimentalTime::class)
fun kotlin2() {
    val arrayListDuration = measureTime {
        arrayListCode()
    }
    println("ArrayList took ${arrayListDuration.inWholeSeconds} seconds and got ?")

    val linkedListDuration = measureTime {
        linkedListCode()
    }
    println("LinkedList took ${linkedListDuration.inWholeSeconds} seconds and got ?")

}

fun kotlin1() {
    val arrayListDuration = measureNanoTime {
        arrayListCode()
    }
    println("ArrayList took ${TimeUnit.NANOSECONDS.toSeconds(arrayListDuration)} seconds and got ?")

    val linkedListDuration = measureTimeMillis {
        linkedListCode()
    }
    println("LinkedList took ${TimeUnit.NANOSECONDS.toSeconds(linkedListDuration)} seconds and got ?")

}

fun javaStyle() {
    val begin = System.nanoTime()
    val result = arrayListCode()
    val duration = System.nanoTime() - begin
    println("ArrayList took ${TimeUnit.NANOSECONDS.toSeconds(duration)} seconds and got $result.")

    val begin2 = System.nanoTime()
    val result2 = linkedListCode()
    println("LinkedList took ${TimeUnit.NANOSECONDS.toSeconds(System.nanoTime() - begin2)} seconds and got $result2.")
}

private fun linkedListCode() = fillList(LinkedList())

private fun arrayListCode() = fillList(ArrayList())

fun fillList(list: MutableList<Int>): Int {
    (0..50_000000).forEach { list.add(it) }
    return list.reduce { acc, i -> acc + i }
}