If you’re an Android developer. Probably java is your go-to language for building Android apps. But did you know that new languages that might challenge Java in the Android world is Kotlin.
Kotlin was first introduced by JetBrains in 2011, which is the originator of IntelliJ IDEA, PyCharm, and many other top IDEs. It got its name from ‘Kotlin Island’ in St. Petersburg, Russia.
Android Oreo will support the Kotlin language and tools with the recent Android studio 3.o by default. As you can find in the description of the official android website “Kotlin is expressive, concise, extensible, powerful and a joy to read and write”. It´s also the first language to be added to Android.

Interoperability with Java
Kotlin was created to be better than Java in every possible way. But JetBrains didn’t put an effort to write an entire new IDE’s from scratch. This was the reason why Kotlin was made 100% interoperable with Java. Kotlin is interoperable with java in every way.
You can call Kotlin code from Java, and you can call Java code from Kotlin, so it’s possible to have Kotlin and Java classes side-by-side within the same project, and everything will still compile. This flexibility is useful when you are starting with the Kotlin as it allows you to introduce Kotlin into an existing project.
Kotlin and Java both compile to bytecode, so there won’t be any issues and you can release an app that consists of Java and Kotlin code.

Readable and concise
If you compare a Kotlin class and a Java class that are performing the same work, then the Kotlin class will generally be much more concise.

Data classes
Focus on expressing your ideas and write less boilerplate code. Generally, in our project we use POJO classes to hold the data In Java, you’ll find yourself writing lots of boilerplate code for these classes. Typically, you’ll need to define a constructor, fields, getter and setter functions for each field, hashCode(), equals() and toString() functions.
In Kotlin, if you include the ‘data’ keyword in your class definition, then the compiler will perform all this work for you, including generating all the necessary getters and setters:
// create POJO with getters, setters, equals(), hashcode(), toString() with single line:
data class User(val name: String, val email: String)

Use lambdas to simplify your code.
button.setOnClickListener(new View.OnClickListener(){
    public void onClick(View v){

button.setOnClickListener { doSomething() }

Kotlin is null-safe by default
In Kotlin, all types are not nullable by default. If you try to assign or return null value in your Kotlin code, then it’ll fail at compile-time.
var name: String
name = null // Compilation error
val name: String? = null
println(name.length()) // Compilation error

Extension functions
This feature is not available in java. Using this feature, we can extend the class with new functionality. So, if there is a class that you think this particular functionality is missing in it you can use extension function
fun String.checkContactNumWithPrefix(): String {
// Check the contact number string with prefix

You can then call this function on instances of the extended class, via the . notation, as if it were part of that class:
myContactNumber.checkContactNumWithPrefix ()

Following are some new features that Java doesn’t have and Kotlin has
Companion Objects
Primary Constructors
Operator Overloading

It’s not easy to evaluate which language will turn out to be the best. Each of these programming languages has their own set of strengths and weakness. Transitioning to a new language isn’t always that exciting.
You will need at least a month for getting familiar with Kotlin. You also need to keep in mind that Java isn’t going anywhere and will remain essential for Android app development. If you’re running a team of mobile developers, it’s best to experiment with Kotlin one step at a time to check whether the new language brings you any benefits.

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