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Which is Better for Android Development - Kotlin Vs Java?

kotlin vs java

JAVA is the undisputed programming language for a long time, but Android has always been wanting a cutting edge language. For this, KOTLIN came into existence! Today, Kotlin is now known as the official language for Android development.

Many top mobile application development companies in USA to date confuses in between mobile app programming languages. While java programming is the oldest, the Kotlin is said to be the best.

Thus, in today's blog, we are going to discuss on Kotlin vs Java. Also, we will tell you how Kotlin with Java operators can work well in app development projects?

We’ll be discussing today’s blog content topics in the following order:

So, the question is, should we replace Kotlin with Java or not? Well, it depends on individual preferences, but we had our answers at the end of the blog. However, before you or your company make any changes, it is a must to understand the two programming languages.

Java is object-oriented programming (OOPs) language. Codes and programs developed in Java will clearly execute in a JVM (Java virtual machine) on multiple platforms, operating systems, and devices.

Kotlin is a new modern feature-based statically typed programming language, which is a good choice to develop server-side applications and allow users to write and expressive codes concisely. Kotlin is developed by JetBrains.

Let’s go and dig deep to find which one of them is best for the Android operating system. Is it Java for Android or Kotlin for Android?

Understanding Everything on Kotlin!

JetBrains integrated all the development environments including the Java mobile environment to give a new one named Kotlin.

After Google announced it as the Android’s official programming language in Google I/O 2018, Kotlin gained momentum. Soon, Google started switching Java with Kotlin in Android.

Kotlin is a statically typed open-source language in which you can compile JavaScript using JVM - Java Virtual Machine to build code that can easily run on iOS. For this, you just have to install the Kotlin plugin.

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Next, you have to configure your project!

Pros of Kotlin

  • Kotlin is good in Android development, but developers also use it in backend projects development.
  • Kotlin is fully functional with Android, JavaScript, JVM, and native. Being a multiplatform framework, extracting a common codebase is easy.
  • Use Kotlin directly in the Gradle build scripts using scripting capabilities.
  • Using the Kotlin plugin, you can easily switch from Java to Kotlin.
  • It supports modern programming features and concepts to help developers build clean and best APIs.
  • The easy built-in null safety support of Kotlin is full of old Java-style APIs.
  • Kotlin is more concise and expressive than Java.
  • Chances of error in Kotlin are less.
  • Writing new modules in Kotlin is easy while working alongside the Java code.
  • Kotlin is compatible with all Java libraries and frameworks.

Cons of Kotlin

  • Kotlin isn’t easy to learn as a programming language, it is a challenge for beginners.
  • With the smaller developer community and limited learning resources, it is difficult to find answers to the queries and questions.
  • Finding an experienced mentor and developer of Kotlin is also difficult.
  • Kotlin is a highly declarative language that sometimes generates a great amount of code.

java vs kotlin

Understanding Everything About Java!

Java is said to be the most valuable, required, and must language of developers in the Android app development. It is because Android OS itself is written using Java.

Sun Microsystems which is now Oracle’s property developed Java, an object-oriented programming language around 20 years ago!

And its popularity only seems to grow beyond horizons because of the following advantages:

Pros of Java

  • Easy to learn, write code, and understand
  • Flexible, scalable, handy, reusable code feature, and always have updated software.
  • Android app development relies on Java as its most libraries are for the Android SDK. You can hire Android app developers in USA if you want to develop applications using Java.
  • Java has a massive open-source ecosystem which accelerates the assembly within Gradle in the large projects;
  • Java apps after development are more compact and easy to optimize, have better, and are lighter.

Cons of Java

  • Java sometimes causes problems in Android API due to its own limitations.
  • Java has a higher risk of errors and bugs.
  • Java requires a lot of memory which makes it slower to many other programming languages.

Kotlin vs Java: Which is Better?

The advantages of Kotlin over Java are that Kotlin is interoperable, concise, has an easy learning curve, and provides enhanced run-time performance.

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But, the advantages of Java over Kotlin are that Java has a higher compilation speed, Java's community has the world's best experts in it, and have strong libraries which are even used by Kotlin. You can use the features of Android Studio in Java versions.

Head to Head Comparision: Kotlin vs Java


Features Java Kotlin
High-Order Functions & Lambdas Implemented using Callables Comes as one of the prebuilt features
Support for Constructors Have multiple constructors but no secondary constructors Can have one or more secondary constructors
Data Classes Required to write a lot of boilerplate code Requires adding only the data keyword in the class definition
Checked Exceptions Available Unavailable
Wildcard Types Available Unavailable
Static Members Available Unavailable
Non-private Fields Available Unavailable
Ternary Operator Available Unavailable
NullPointerExceptions Available Unavailable
Implicit Widening Conversions Available Unavailable
Can’t be labeled as concise Better than Java Code Conciseness
Primitive Types Variables of a primitive type aren’t objects Variables of a primitive type are objects
Smart Casts Unavailable Available
Inline Functions Unavailable Available
Coroutines Unavailable Available
Extension Functions Unavailable Available
Native Support for Delegation Unavailable Available

Why use Kotlin for Android?

We know that Java is working fine for Android. What is the point in making a shift from Java to Kotlin in the Android app development?

The most critical thing to understand here is that Kotlin is designed to address issues of Java. Nowadays, Kotlin provides an important safety mechanism as it is far more concise, out-of-the-box, and expressive than Java.

“At the same time, Kotlin comes under the top five languages used and exercised by the developers. This new language Kotlin is at number 4 after Rust, Python, and Typescript!”

Kotlin is a statically typed language that comes with in-built Android Studio for Android app programming language.

Since 2018, 1.5 million developers are writing codes for app development in Kotlin. It is enough to tell about the superiority of the leading programming language for Android. Not only in the Android OS, but Kotlin is also used in making iOS apps.

If you have plans to develop iOS apps in Kotlin, then hire an iPhone app developer in USA from us. Our developers know how to use Kotlin for Android and iOS!

Will Kotlin Replace Java?

From the above discussions, what we now know is that Kotlin offers more advantages than Java. However, Kotlin has many shortcomings though Kotlin has powerful features just like Java.

If you are planning to use Kotlin, then try giving one-month minimum time to you for becoming familiar with Kotlin as it is not easy t learn Kotlin.

Hence, our answer is NO, Kotlin can't replace Java!

They both bind together in a splendid manner to give a more improvised version for the practice of Android development. Our final conclusion is as follows:

“If you're a beginner and enjoy challenges, we recommend you to use Kotlin, especially when you are working on some innovative project!”

As a beginner mobile app developer, it is best to experiment with Kotlin. It is a new language and might give you tangible benefits.

Have some doubts about app development? Contact us, comment your valuable responses on the blog in the comment section below!