Kotlin vs Java: Which One Should You Choose?

08 September6 min read
Kotlin vs Java: Which One Should You Choose?

33.27% of developers use Java, while 9.16% of the developer community uses Kotlin. Java's high figures prove that it is the programming language of choice for developers.

Even yet, there are a lot of questions that arise when we contrast Java versus Kotlin. Is Java preferable to Kotlin? What distinguishes the two programming languages from one another? And many more.

The object-oriented programming language Java has been widely used for more than 23 years. On the other hand, JetBrains created the cross-platform programming language Kotlin in 2011 to work seamlessly with Java. It is also considered Google's official language for developing Android Apps

Although Java is a fantastic programming language with significant community support, when Kotlin enters the picture, it complements Java. 


In this blog, we'll explore what distinguishes Java from Kotlin and which one is better.

Comparing Kotlin and Java

The main distinction between Kotlin and Java is that while Java is restricted to exclusively object-oriented programming, Kotlin includes concepts from both object-oriented and functional programming. Furthermore, Java does not allow for the easy exchange of Kotlin for Java, but Kotlin does. 

Let's understand the detailed comparison between Kotlin and Java to know more about both programming languages: 

Ample Functions

Java doesn't have many complex functions. To add this capability, programmers must construct new and parent classes.

On the other hand, the functionality of many functions is available in Kotlin. By simply prefixing the names of a class and a function, programmers can easily add extended functions to an existing class. 

Static Members

In Java, static members are available. It is mainly employed for managing memory. Developers can use Java static keywords with various methods, variables, blocks, and nested classes.

In Kotlin, creating static members of a class requires using companion objects. Declaring an object inside the class that can be designated with a companion keyword is all required. Without limiting the container class, the companion object functions as a static member and provides direct access. 

Operator Overloading

Operator overloading allows the utilization of the same operator on different data types. Java doesn't support operator overloading. But, for instance, the + operator can be used in Java for concatenation and addition. 

Kotlin supports operator overloading. It allows for custom implementation for a predefined set of operators on types such as + and * with precedence. Users need to invoke the special member function with the specific name of the corresponding data type to implement operator overloading. 

Language Scripting

Language scripting allows developers to execute different functions automatically, which would otherwise require manual implementation. Java doesn't enable developers to utilize language scripting capabilities.  

Kotlin offers language scripting integration in existing scripts. The developers can use the language in their Gradle build scripts. 

Type Inference

Type Inference is the automatic detection of the data types for specific expressions in a programming language. Java doesn't allow type inference, as developers need to specify each variable before the declaration. 

Kotlin allows type inferencing as you don't have to declare the type of each variable separately. Kotlin will automatically handle this functionality. 

Smart Cast

Smart Cast is not available in Java. To perform this functionality, developers need to perform two separate functions. The first function checks the variable type and then casts it with the right type. 

Kotlin supports Smart Cast Feature. The compilers can use the smart cast to track the object and the variable and then cast them into specific call methods and types. 

Although the differences are still ongoing, the comparison between Kotlin and Java is a never-ending debate. Let's discuss the top applications developed using Java and Kotlin, respectively. 

Top Applications Developed Using Java

Various well-known applications, such as Opera Mini, Spotify, Twitter, Signal, CashApp, etc., have been developed using Java, making the programming language popular among its users. 

Opera Mini

One of the most popular Java programs among mobile internet users is Opera Mini, which is well-recognized for accelerating page load times by reducing unused images on websites.

Even with a weak Wi-Fi connection, you may surf the Internet more quickly using this small and secure browser. This browser offers a function for in-app file sharing. Other than this, some of the best features include private browsing, smarter downloading, ad blocking, and tailored news.


Users of the popular music streaming software Spotify can listen to almost any song, album, or artist. In this app, users can find podcasts at any time. Any device, including a phone, tablet, and computer, can access Spotify.

Spotify is tempting since users may join up using their email addresses or connect with Facebook to get content for free. All one needs to do is download the Spotify app and subscribe to enjoy the premium features. There is no commitment, and starting is simple.

Top Applications Developed Using Kotlin

Various renowned apps, such as Netflix, Pinterest, Tinder, Airbnb, Uber, etc., are developed using Kotlin, which makes it no less than the first choice of developers when compared to Java. 


Netflix has 183 million paid subscribers in 190 countries, making it the most popular streaming entertainment provider in the world. The Netflix Android app's current UI player has been completely redesigned in Kotlin.

Netflix is also the first FAANG Company to use Kotlin Multiplatform (KMP) in production on a large scale. The company is further innovating the physical production of Films and TV using KMP and other mobile technologies. 


Pinterest, a distinctive and well-known image-sharing platform, claimed to use Kotlin in its Android app. The company's main language for developing Android applications is Kotlin. According to one of the Android programmers at Pinterest, Kotlin has made it easier for engineers to write correct, concise, and straightforward code.

The app's team and consumers benefited more from the migration from Java to Kotlin. Kotlin helped Pinterest write code more quickly and effectively, cutting down on time compared to Java.


Herein we discussed the significant points to justify the comparison between Kotlin and Java. Kotlin is one of the preferred options for Android App Development, keeping convenience and popularity in mind. On the other hand, Java is a programming language that Android users have long favored; it will be replaced over time.

To make an informed choice, the benefits and drawbacks of both programming languages should be weighed against the project's needs. If you're unsure which language to pick between Java and Kotlin, please get in touch with us at any time, and we'll put you in touch with the best software vendors available from our extensive network to assist you in making the right choice.