how to make array in kotlin

fun main(args: Array<String>) { 
    // creating empty arraylist using constructor 
    var arraylist = ArrayList<String>() 
} 

val a: Array<Double> = arrayOf(3.0, 4.5, 8.0, 19.0)

val num = arrayOf(1, 2, 3, 4)   //implicit type declaration
val num = arrayOf<Int>(1, 2, 3) //explicit type declaration