Kotlin vs Java: Which one should you choose for your next project?

If you're a software developer looking to build great software, there are a plethora of programming languages to choose from today. But Kotlin and Java stand out in the crowd, thanks to their amazing features and powerful capabilities.

Wait, haven't you heard of Kotlin before?

Well, Kotlin is a relatively new language that's quickly gaining popularity due to its simplicity, safety, and cross-platform support. It was developed by JetBrains and is compatible with all existing Java frameworks and libraries. In other words, Kotlin can be used as a drop-in replacement for Java. So, if you're still wondering whether Kotlin is worth trying, the answer is a big YES! It's definitely worth your time.

But, what about Java? Doesn't Java dominate the programming world?

You're not wrong there. Java is still one of the most widely used programming languages in the world, thanks to its popularity and several decades of maturity. Java has been around since the mid-1990s, and it is a very stable language with a huge community of developers who support it. Java has proven to be an excellent choice for large-scale enterprise applications.

So, Java or Kotlin?

Choosing between Java and Kotlin depends on the kind of project you're working on. In this article, we will compare both languages and help you decide which language suits your project better.


Java has been around for a long time, and therefore, it's been optimized to the core. Java is a very fast language thanks to its just-in-time (JIT) compiler. The JIT compiler compiles byte-code into machine code on-the-fly, making Java run quickly. However, Kotlin is no slouch either. Kotlin has been designed to interoperate with Java, so it makes use of the same JIT compiler technology that Java uses, making Kotlin's performance similar to Java's.


One of the main reasons why Kotlin was created was to improve Java's syntax. Kotlin has a cleaner and more concise syntax than Java. For example, in Java, to create a class, you need to type a lot of boilerplate code. In Kotlin, you can create a class with a single line of code.

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
fun main() {
    println("Hello, World!")

Kotlin does away with null references, making your code safer to work with. Kotlin also includes several operator overloading features, reducing the amount of boilerplate code you need to write.


One major advantage of Kotlin is that it is fully interoperable with Java code. As Kotlin runs on the Java Virtual Machine (JVM), you can easily integrate Kotlin code with Java code. Kotlin can use Java libraries, and Java classes can also use Kotlin classes. It means that you can easily migrate your Java code to Kotlin or vice versa.

This interoperability makes Kotlin an excellent choice for Java developers who are looking to adopt a cleaner syntax and work with a safer language.

Learning Curve

Kotlin was designed to be easy to learn for developers who already know Java. If you are familiar with Java, you can easily learn Kotlin in just a few days. Kotlin's syntax is more concise, so you will write less code to do the same things you would do in Java. Kotlin also has excellent IDE support in IntelliJ Idea, allowing you to write code more efficiently.

Community Support

Java has been around for around 25 years, and it has a massive community of developers. When you work with Java, you have access to a wealth of libraries, frameworks, and tooling. Kotlin is a relatively new language, but it has grown quickly, thanks to its clear syntax and powerful features. Kotlin has an active community that is still growing.

Functional Programming

Kotlin has been designed to support functional programming better than Java. Kotlin supports higher-order functions, lambda expressions, and extension functions, allowing you to write cleaner and more concise code. Kotlin has also adopted several features from other functional programming languages, including the Elvis operator, safe casts, and the let, apply, and run functions.

Android Development

Kotlin is officially supported by Google for Android development. Since Google announced that Kotlin would be an officially supported language for Android development, more and more developers have started using Kotlin for their Android projects. Official support from Google means that Kotlin will get better tooling, libraries, and resources for Android developers.


So, which language should you choose for your next project? When it comes to Java vs Kotlin, both languages have their pros and cons. If you're working on a project that already uses Java or needs to interoperate with a Java codebase, then sticking with Java is a good option. On the other hand, if you're starting a new project and want a cleaner syntax, take advantage of Kotlin's functional programming features, or prefer a safer, more concise language, then Kotlin is the way to go.

Ultimately, the decision comes down to your requirements and personal preferences. Both languages are excellent in their way, and you can't go wrong with either. However, Kotlin is a faster, safer, and more concise language that's more fun to work with. On the other hand, Java has a massive community that is highly active, with thousands of libraries and resources at your fingertips.

So, which one will you choose?

Editor Recommended Sites

AI and Tech News
Best Online AI Courses
Classic Writing Analysis
Tears of the Kingdom Roleplay
Data Catalog App - Cloud Data catalog & Best Datacatalog for cloud: Data catalog resources for AWS and GCP
Terraform Video - Learn Terraform for GCP & Learn Terraform for AWS: Video tutorials on Terraform for AWS and GCP
Graph Reasoning and Inference: Graph reasoning using taxonomies and ontologies for realtime inference and data processing
Roleplay Community: Wiki and discussion board for all who love roleplaying
Labaled Machine Learning Data: Pre-labeled machine learning data resources for Machine Learning engineers and generative models