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Kotlin Articles
Page 4 of 21
Kotlin Program to Swap Two Numbers
In this article, we will understand how to how to swap two numbers in Kotlin. This is done using a temporary variable. Below is a demonstration of the same Suppose our input is val1 : 45 val2 : 60 The desired output would be val1 : 60 val2 : 45 Algorithm Step 1 − Start Step 2 − Declare three integers: val1, val2 and tempVal Step 3 − Define the values Step 4 − Assign val1 to temporary variable Step 5 − Assign val2 to val1 Step 6 − Assign temporary tempVal variable to val2 Step 7 ...
Read MoreKotlin Program to Add two Numbers
In this article, we will understand how to add two numbers. This can be done using the ‘+’ operator. Below is a demonstration of the same Suppose our input is input1 : 10 input2 : 15 The desired output would be Sum : 25 Algorithm Step 1 − Start Step 2 − Declare three integers: val1, val2 and sum Step 3 − Define the integers Step 4 − Add the two values using an addition operator (+) Step 5 − Display the result Step 6 − Stop Example 1 In this example, we will add two numbers ...
Read MoreKotlin Program to Print an Integer
In this article, we will understand how to print an integer. Integer is a primitive data type that contains numbers up to 32 bits. Below is a demonstration of the same − Suppose our input is − 45 The desired output would be − The integer is: 45 Algorithm Step 1 − START Step 2 − Define the integer value in a variable Step 3 − Display it on the console Step 4 − STOP Example 1 In this example, we will simply print an integer using the print() method. First, declare an integer variable, which ...
Read MoreHello World program in Kotlin
In this article, we will understand how to print hello world in Kotlin. Hello world is stored as a string format and is printed using ‘print()’ function. Input Suppose our input is Hello World Output The expected out should be Hello World Algorithm Step 1 − START Step 2 − Define a string variable Step 3 − Display the string on the console Step 4 − STOP Example 1 In this example, we will simply display a string “Hello World” using the print() method in Kotlin − fun main() { val inputStr = ...
Read MoreHow to find the number of repeated values in a Kotlin list?
In this article, we will see how to find the number of repeated values in a Kotlin list.Example – Finding Repeated Values Using groupingBy()The Kotlin library provides an inline function called groupingBy() which creates a grouping source from an array to be used later with one of the group-and-fold operations using the specified keySelector function to extract a key from each element.The function declaration of groupingBy() looks like this −inline fun Array.groupingBy( crossinline keySelector: (T) -> K ): GroupingIn this example, we will create a list of values and implement groupingBy() in the list.fun main(args: Array) { ...
Read MoreHow to create a mutable list with repeating elements in Kotlin?
A Mutable List is an interface and generic collection of elements. Once a collection is declared as mutable, it becomes dynamic and we can modify its data as per requirement. A mutable list grows automatically in size as we insert new elements into it. The Mutable List inherits form the Generic class.Example – Creating a Mutable List in KotlinIn order to create a mutable list of repeating elements, we will be using Kotlin List(). By definition, it looks like this−inline fun List( size: Int, init: (index: Int) -> T ): ListAs we pass an initial default value, ...
Read More@Throws Annotation in Kotlin
The concept of exception in Kotlin is very much same as it is in Java. All the exceptions in Kotlin are the descendants of the Throwable class. @Throws annotation indicates what exceptions should be declared by a function when compiled to a JVM method.Example – Throwing exception using a methodIn this example, we will create a scenario where we will generate a logical arithmetic exception, but we will try to throw a different exception using the @throws annotation and a function call.import java.io.* import kotlin.jvm.Throws fun main(args: Array) { val item=0 var result=0 try { ...
Read MoreHow to initialize List in Kotlin?
List denotes a List collection of generic data type. By , we understand that the List does not have any specific data type. Let's check how we can initialize such a collection in Kotlin.List can be of two types: immutable and mutable. We will see two different implementations of initializing List.Example – Initialize List ~ Immutable ListOnce a list is declared as Immutable, then it becomes read-only.fun main(args: Array) { var myImmutableList = listOf(1, 2, 3) // Convert array into mutableList // Then, add elements into it. myImmutableList.toMutableList().add(4) // myImmutableList is not a ...
Read MoreHow to replace duplicate whitespaces in a String in Kotlin?
In order to remove extra whitespaces in a string, we will use the replace() function along with toRegex() function from the String class. To replace all the consecutive whitespaces with a single space " ", use the replace() function with the regular expression "\s+" which matches with one or more whitespace characters.Example – Removing extra whitespaces in KotlinTake a look at the following example −fun main(args: Array) { var myString = "Removing ex tra spa ce from String" println("Input String: " + myString) // removing duplicate whitespace println("Extra whitespaces removed: " + myString.replace("\s+".toRegex(), " ...
Read MoreHow to use Java's bitwise operators in Kotlin?
Kotlin provides a set of bitwise operators that we can use on integers. These operators can be applied only to Int and Long type variables. Here is the list of bitwise operations available in Kotlin −shl(bits) – Signed Shift leftshr(bits) – Signed shift rightushr(bits) – Unsigned shift rightand(bits) – Bitwise AND operatoror(bits) – Bitwise OR operatorxor(bits) – Bitwise XORinv() – Bitwise inversionKotlin does have functions for each of them.Example: Bitwise Operators in KotlinThe following example shows how you can implement the bitwise operators in Kotlin.import java.lang.* fun main(args: Array) { val value = 5 println("Input value: " + ...
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