Kotlin example for Beginners – Kotlin Program to Convert Array to Set (HashSet) and Vice-Versa

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Kotlin Program to Convert Array to Set (HashSet) and Vice-Versa

In this program, you’ll learn to convert an array to a set and vice versa in Kotlin.

Example 1: Convert Array to Set


import java.util.*

fun main(args: Array<String>) {

    val array = arrayOf("a", "b", "c")
    val set = HashSet(Arrays.asList(*array))

    println("Set: $set")

}

When you run the program, the output will be:

Set: [a, b, c]

In the above program, we’ve an array named array. To convert array to set, we first convert it to a list using asList() as HashSet accepts list as a constructor.

Then, we initialize set with the elements of the converted list.


Example 2: Convert Set to Array


import java.util.*

fun main(args: Array<String>) {

    val set = HashSet<String>()
    set.add("a")
    set.add("b")
    set.add("c")

    val array = arrayOfNulls<String>(set.size)
    set.toArray(array)

    println("Array: ${Arrays.toString(array)}")

}

When you run the program, the output will be:

Array: [a, b, c]

In the above program, we’ve a HashSet named set. To convert set into an array, we first create an array of length equal to the size of the set and use toArray() method.

 

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