Kotlin Programming Examples

Kotlin Collections

kotlin

fun main(args: Array<String>) { 
   val numbers: MutableList<Int> = mutableListOf(1, 2, 3) //mutable List 
   val readOnlyView: List<Int> = numbers                  // immutable list 
   println("my mutable list--"+numbers)        // prints "[1, 2, 3]" 
   numbers.add(4) 
   println("my mutable list after addition --"+numbers)        // prints "[1, 2, 3, 4]" 
   println(readOnlyView)     
   readOnlyView.clear()    // ⇒ does not compile  
// gives error  
}

Inline Function

kotlin

fun main(args: Array<String>) {
   val mylambda:(String)->Unit  = {s:String->print(s)}
   val v:String = "TutorialsPoint.com"
   myFun(v,mylambda) //passing lambda as a parameter of another function 
}

fun myFun(a :String, action: (String)->Unit) { //passing lambda 
   print("Heyyy!!!")
   action(a)// call to lambda function
}

inheritance

kotlin

import java.util.Arrays

open class ABC {
   open fun think () {
      print("Hey!! i am thinking ")
   }
}
class BCD: ABC() { // inheritance happens using default constructor 
   override fun think() {
      print("I Am from Child")
   }
}
fun main(args: Array<String>) {
   var  a = BCD()
   a.think()
}

When

kotlin

fun main(args: Array<String>) {
   val x:Int = 5
   when (x) {
      1,5 -> print(" Value of X either 1,5")
      
      else -> { // Note the block
         print("x is neither 1 nor 2")
      }
   }
}

Kotlin Hello World!

kotlin

fun main(args: Array<String>) { 
    println("Hello, World!") 
}

Exception Handling

kotlin

fun main(args: Array<String>) { 
    try{ 
        val myVar:Int=12;        val v:String="Tutorialspoint.com" 
        v.toInt();
    }catch(e:Exception){ 
      e.printStackTrace();
    }finally{ 
        println("Exception Handeling in Kotlin");
    } 
}

Destructuring Declarations

kotlin

fun main(args: Array<String>) { 
    val s=Student("TutorialsPoint.com","Kotlin") 
    val (name,subject)=s 
    println("You are learning "+subject+" from "+name) 
}  
data class Student( val a :String,val b: String ){ 
   var name:String=a 
   var subject:String=b 
}

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" 
}

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