Jupiter Adding element to middle of an ArrayList In the below example, we are using add method to add Jupiter to the end of planets list. We can add elements to end of an ArrayList using add function call. Saturn Adding element to end of an ArrayList Planets.addAll(listOf('Jupiter', 'Saturn')) In the following example, we are adding more planets to our list of planets using addAll method. We can use method addAll to add a list of elements to array list. Pluto Adding elements to an existing ArrayList In the following example, we are iterating through array list of planets and printing each planet. We can use for loop to iterate through an arraylist in Kotlin. Var planets = arrayListOf('Mercury', 'Venus', 'Earth', 'Pluto')

In the following example, we are creating an arraylist with list of planets and then printing the arraylist. We created String theory of empty cosmos below. We can create an array list using arrayListOf builtin function. In this tutorial we will go through features of ArrayList in Kotlin. Note that altering a mutable collection doesn't require it to be a var.ArrayList provides implementation for MutableList interface in Kotlin. Val numbers = mutableListOf('one', 'two', 'three', 'four') Mutable collections provides both read and write methods. When you run the above Kotlin program, it will generate the following output: Val numbers = listOf('one', 'two', 'three', 'four')

Immutable Collection or simply calling a Collection interface provides read-only methods which means once a collection is created, we can not change it because there is no method available to change the object created. Kotlin provides the following types of collection: Keys are unique, and each of them maps to exactly one value. Kotlin Map - Map (or dictionary) is a set of key-value pairs. Kotlin Set - Set is a collection of unique elements which means a group of objects without repetitions. Elements can occur more than once in a list.

Kotlin List - List is an ordered collection with access to elements by indices. The following collection types are relevant for Kotlin: The Kotlin Standard Library provides a comprehensive set of tools for managing collections.

A collection usually contains a number of objects of the same type and Objects in a collection are called elements or items. Collections are a common concept for most programming languages.

Kotlin arraylist