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Kotlin vs. Java: Which One is Better For Android App Development

In the app development world, there’s a never-ending debate between Kotlin and Java – which is the better programming language? Is one better than the other for specific reasons?

Introduction of Java and Kotlin

Java and Kotlin are the most popular programming languages for developing Android apps. Both languages have pros and cons, and deciding which one to use for your app development project can be challenging. In this blog post, we’ll compare Kotlin and Java side-by-side, so you can see which language is better suited for your needs.

  • Java has been around for over 20 years and is the most used programming language in the world. It’s known for being versatile and easy to learn, making it a good choice for beginners. However, Java can be slow and cumbersome, especially with large projects.
  • Kotlin is a newer language that was designed specifically for developing Android apps. It runs on the JVM (Java Virtual Machine) and is fully compatible with Java. Kotlin is known for being concise, safe, and fast. It’s also much easier to learn than Java, making it a good choice for app development.

Features of Kotlin and Java

Kotlin & Java are two of the most popular programming languages for Android app development. They both have features that make them unique and well-suited for different apps. Here is a comparison of some of the critical components of Kotlin and Java:


A statically typed language that can help you avoid null pointer exceptions. It has type inference, which can help you write code more concisely. Kotlin supports higher-order functions, making it easy to write functional code. It has data classes, which make it easy to create immutable objects. Kotlin also has built-in support for delegation, allowing you to delegate responsibility for some tasks to other objects.


A platform-independent language that runs on any platform with a Java Virtual Machine. It has many libraries that provide many useful functions. Java is an object-oriented language that allows you to encapsulate data and behavior in objects. It also supports inheritance and polymorphism, which can be used to create powerful abstractions. Java has a garbage collector that automatically frees memory when no longer needed, making it easier to manage memory usage in your app.

Key Differences: Kotlin vs Java


One key difference between Java and Kotlin is that the former is primarily an object-oriented programming language while the latter supports functional programming. Kotlin code can be more concise and expressive than Java code. It enables extra features like type-safe builders.


With Java, it is possible to attribute a null value to any variable. It means referring to no object and referencing it while bringing the NullPointerExceptions into play. And, with Kotlin, the code will stop compiling while trying to attribute null values to variables or objects by default.


In Java, it would require checking the variable type according to the operation. At the same time, its intelligent casts manage the casting checks in the Kotlin feature to automatically collect redundant casts.


With Java, the developers must catch or declare exceptions – even though it is frustrating and time-consuming. Though, with Kotlin, the developers are not required to go through this process often.

Data classes

With Java, the developers need to declare the fields or variables to store data, the constructor, and the getter/setter functions for the areas/variables. Meanwhile, Kotlin simplifies the process of creating data classes while only including the keyword “data” in the class definition.

Which One is Better For Developing Android Apps – Kotlin and Java

It is a common question that developers ask- Kotlin or Java? Which one should be used for Android app development? Both of these languages have their pros and cons. It depends on the project and business requirements on which one to choose between a Java app development company or one for Kotlin.

If you’re wondering whether Java vs Kotlin is better for Android development, there isn’t a clear answer. Both have their benefits and drawbacks – however, certain factors may make one more suitable for your needs than the other. With Kotlin, you can enjoy many features that aren’t available in Java. For example, Kotlin has null safety built into the language, meaning you can avoid those pesky NullPointerException errors. It also supports data classes and lambdas, making your code more concise and expressive.

However, Kotlin has some drawbacks. For example, it doesn’t have as much support from the Android community as Java does. And because it’s a relatively new language, some kinks still need to be ironed out if you decide to write code with Kotlin.

So, which one should you choose – Kotlin or Java? Whether starting a new project from scratch, Kotlin might work for you – especially if you’re in a group of Android developers. However, for an existing project written in Java, it would be best to stick with that language for now, even though that code can be called from Kotlin.


Both Java and Kotlin are popular programming languages that are often used for Android development, with their strengths and weaknesses. Choosing the right one for your needs comes down to personal preference, and this article has gone through some of the critical differences between Kotlin and Java to help you pick.


Written By

A professional and security-oriented programmer having more than 6 years of experience in designing, implementing, testing and supporting mobile apps developed. Being techno geek, I love to read & share about the latest updates in technology including but not limited to IoTs, AI, application development, etc. In my free time, I like to play football, watch movies and explore new places. I have been learning mobile app development since 2012. With having a good understanding of programming languages, I develop native as well as web apps for both iOS & Android using latest tools & technologies. I am also having experience in both front-end & back-end development.

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