Java to Kotlin
migrate your old app code to the new territories
Java to Kotlin conversion
Your Java mobile app project might have been created some time ago and it might seem difficult to develop
further due to cluttered and not very transparent coding.
We believe that converting your Android app from Java to Kotlin will allow you to expand your app with new
features while keeping a neat and orderly coding environment at the same time.
Here are some facts to prove that converting Java to Kotlin is a good idea
Kotlin introduces data keyword for classes. It basically has the same purpose as the Java model class, but
the number of lines needed to achieve it is incomparably lower.
All variants of constructors, getters and setters methods are declared on the top of a class, thanks to
this your data class can an one-liner.
It allows to declare default arguments which makes overloading of the methods in one declaration, no need
for boilerplate code as it is in Java.
It has got great mechanisms for making code reusable, extension functions can be created for any objects,
including Java classes.
It provides a null-safety coding environment, which keeps infamous
Java NullPointerException just a memory of the past.
Code in Java
Code in Kotlin
Kotlin creates a more readable and lightweight wireframe for developing new features without excessive amount
of work and creating spaghetti monsters.
Current predictions are that within a year all Android Apps will be written in Kotlin - it is simply easier and
Our job on a project
Evaluating the quality of the existing code
Building rationale for converting from Java to Kotlin
Basing the new code on an existing project in order to guarantee app continuity on Google Play
Code rewriting in batches to make sure all app functionality is covered - piece after piece continuity on
Updates with new parts of code rewritten to Google Play continuously without any interference in user
Benefits for your organisation
Better time to market - faster reaction to current trends
Quicker and smoother onboarding of new devs
Faster implementation of unit tests and easier testing
Better exchange in information between Android and iOS interference in user experience
Frequently Asked Questions
Is it better to use basic automatic converters for rewriting Java source files or to program in Kotlin from
It depends on the complexity and actual condition of the project, some project will need writing from scratch
in Kotlin, and for some refactor to Kotlin will be enough.
What is the best way to convert my Java file to Kotlin?
If you want to do this automatically we recommend to use IntelliJ IDEA or Android Studio where you can
navigate to Code menu and then choose Convert Java File to Kotlin File option. Note that newly converted file
have no .kt extension.
Is Kotlin better?
If we talk about Android it is true that applications for this platform can be written in several languages
and can run on Java virtual machine. Kotlin is one of those languages, it is JVM compatible, and as it was
designed to be better than Java with all its superpowers it's hard to find any better language for Android so
Is Kotlin Java compatible?
Yes, it's fully interoperable with Java. Kotlin creator put major efforts on making sure that the existing
Java codebase can interact properly with Kotlin. Kotlin code can be easily called from Java and Java code
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