Kotlin For Android Developers

Kotlin For Android Developers

Kotlin is a new programming language from JetBrains, the maker of the world’s best IDEs. Now Kotlin supported by Google For Android.
Kotlin comes from industry, not academia. It solves problems faced by working programmers today. As an example, the type system helps you avoid null pointer exceptions. Research languages tend to not have null at all.

1. Why Kotlin

1.1 Java Interoperability
Kotlin language is inter-operable with java. It means we can user previous java project with new kotlin classes also and all java frameworks are still available. We have a one click java to kotlin converters also.
1.2 Familiar syntax
Kotlin Language syntax is very familiar to any programing language who came from OOP domine. There are some differences compare to Java such as val, var
Class Example{
val a:String= “Kosmik” //val means unmodifiable
Var i:int=1 // var means modifiable
Fun hellworld(){
Val str=”hello”
print(“$str World”)
1.3 String Interpolation
It’s as if a smarter and more readable version of Java’s String.format() built into the Kotlin language
var x=4
var y=3
print(“sum of $x and $y is ${x+y}”) //sum of 4 and 7 is 11
1.4 Open Source
It is open source under apache 2.0
1.5 Compatibility
Kotlin is fully compatible with JDK6 and kotlin applications can run on older android devices also
1.6 Performance
Kotlin application will run fast as an equal to java
1.7 Support
Kotlin is fully supported from Android Studio 3.0
1.8 Some Syntaxes
  1. No more semicolons ;
  2. Variable declaration is different in kotlin like var is mutable and val is immutable
  3. Functions in kotlin (methods)

fun sum (x: Int ,y: Int): Int{

return x+y


  1. when function

Now switch changed into when a condition, which is very easy to understand  like below example

when (x) {

   1 -> print(“x is 1”)

   2 -> print(“x is 2”)

   3, 4 -> print(“x is 3 or 4”)

   in 5..10 -> print(“x is 5, 6, 7, 8, 9, or 10”)

   else -> print(“x is out of range”)


6.creating a class in kotlin

val rectangle = Rectangle(5.0, 2.0) //no ‘new’ keyword required

val triangle = Triangle(3.0, 4.0, 5.0)

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