Kotlin Programming Examples

Lambda Function

kotlin

fun main(args: Array<String>) { 
    val mylambda :(String)->Unit ={s:String->print(s)} 
    val v:String="TutorialsPoint.com" 
    mylambda(v) 
}

Lambda Function

kotlin

fun main(args: Array<String>) { 
    val mylambda :(String)->Unit ={s:String->print(s)} 
    val v:String="TutorialsPoint.com" 
    mylambda(v) 
}

Function

kotlin

fun main(args: Array<String>) { 
     
    println(MyFunction("tutorialsPoint.com")) 
} 
fun MyFunction(x: String): String { 
    var c:String ="Hey!! Welcome To ---" 
    return (c+x) 
}

Deligation

kotlin

import kotlin.properties.Delegates  
class User { 
    var name: String by Delegates.observable("Welcome to Tutorialspoint.com") { 
        prop, old, new -> 
        println("$old -> $new") 
    } 
}  
fun main(args: Array<String>) { 
    val user = User() 
    user.name = "first" 
    user.name = "second" 
}

Using Lazy

kotlin

val myVar: String by lazy { 
     
    "Hello" 
}  
fun main(args: Array<String>) { 
    println(myVar +" My dear friend") 
     
}

Deligation Program

kotlin

interface Base { 
    fun printMe() //abstract method 
}  
class BaseImpl(val x: Int) : Base { 
    override fun printMe() { println(x) }   //implementation of the method 
}  
class Derived(b: Base) : Base by b  // delegating the public method on the object b  
fun main(args: Array<String>) { 
    val b = BaseImpl(10) 
    Derived(b).printMe() // prints 10 :: accessing the printMe() method  
}

Generic

kotlin

fun main(args: Array<String>) { 
  var objet=genericsExample<String>("JAVA") 
  var objet1=genericsExample<Int>(10) 
}  
class genericsExample<T>(input:T){ 
    init{ 
        println("I am getting called with the value "+input) 
    } 
}

Sealed Class

kotlin

sealed class MyExample { 
  class OP1 : MyExample() // MyExmaple class can be of two types only 
  class OP2 : MyExample() 
} 
fun main(args: Array<String>) { 
  val obj: MyExample = MyExample.OP2()  
  val output = when (obj) { // defining the object of the class depending on the inuputs  
    is MyExample.OP1 -> "Option One has been chosen" 
    is MyExample.OP2 -> "option Two has been chosen" 
  } 
  println(output) 
}

Data Class

kotlin

fun main(args: Array<String>) { 
    val book: Book = Book("Kotlin", "TutorialPoint.com", 5) 
    println("Name of the Book is--"+book.name) // "Kotlin" 
    println("Puclisher Name--"+book.publisher) // "TutorialPoint.com" 
    println("Review of the book is--"+book.reviewScore) // 5 
    book.reviewScore = 7 
    println("Printing all the info all together--"+book.toString()) //using inbuilt function of the data class  
    println("Example of the HasCode function--"+book.hashCode())   
}  
data class Book(val name: String, val publisher: String, var reviewScore: Int)

Object Extension

kotlin

fun main(args: Array<String>) { 
    println("Heyyy!!!"+A.show()) 
}  
class A{ 
    companion object{ 
        fun show():String{ 
            return("You are learning Kotlin from TutorialsPoint.com") 
        } 
    } 
}

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