Kotlin vs. Java: Which Language is Best for App Development?

September 19, 2023

Most companies considered Java the preferred language for all development of applications, but the introduction of Kotlin has radically changed their point of view. While Java makes your code quite costly, Kotlin for Android developers…


Creating applications for Android allows you to communicate more effectively with your intended customer base. It will enable your company to carve out a position in the current, comparable industry. However, selecting the correct programming language to facilitate this agility is a challenging problem. 

What should you select in 2023 for developing Android applications more quickly: Kotlin or Java?

Most companies considered Java the preferred language for all development of applications, but the introduction of Kotlin has radically changed their point of view. While Java makes your code quite costly, Kotlin for Android developers has shown to be an excellent framework for overcoming difficulties with development.

So, how can you select among the best Kotlin app development companies that fulfills your company’s needs? 

What are Java and Kotlin?

Android applications that link with the system’s operating system and directly use the device’s hardware use Java as their native language. 

This language permits the development of any software and is compatible with practically all sorts of devices and operating systems, including Microsoft Windows, Android, and Linux. It was created by Sun Microsystems (now owned by Oracle) and can be used with Microservices.

The applications of Kotlin are listed below:

  • Spotify
  • Twitter
  • Cash App
  • Signal
  • Amaze File Manager

Features of Java

Java is a dynamic programming language that enables creators to change the layout of an application while it is operating. Java has various security abilities in extra platforms such as Spring and Spring Boot, which are also called Spring Security.

Unlike other multiple-threaded languages, such as C++, Java contains a built-in garbage collector for garbage collection and memory management. Java helps computing to be distributed because the language is network-centric, and it provides verified instances that get detected every time they occur.

Java is commonly recognized for its WORA functionality, “write once, and run anyplace.” Because of this mobility, Java can be used on any system. Java adds static members once and then provides them with available to all class situations.

What is Kotlin?

Kotlin is an enhanced version with several additional functionality. Compared to other programming languages, it is fresh, straightforward, and has less formality and conventions. Creators must still grasp fundamental computer programming principles and structures if they use this programming language to create applications for Android.

The applications of Java are listed below:

  • Pinterest
  • Trello
  • Evernote
  • Twidere for Twitter
  • Shadowsocks

Features of Kotlin

Kotlin is a compressed language that enables creators to write fewer lines of code. Kotlin, as a null-based secure language, manages NullPointerException and null references with its specific call operator. 

Kotlin is fast to build and allows primary as well as secondary operators.

Kotlin includes an interoperable language function that enables it to invoke Java code. It may also generate outside definitions for JavaScript libraries, using the Kotlin-type system entirely.

Because it can be written and translated compared to Java using IntelliJ, NetBeans, Eclipse, and other IDEs, Kotlin is a tool-friendly language. 

Finally, Kotlin features an intelligent cast function that lowers the price of the application while boosting its performance and quickness.

Critical Differences Between Kotlin & Java


The primary distinction between Java and Kotlin is that the former is a language for object-oriented programming, while the latter also allows the use of functional programming. It suggests that Kotlin code can be evident and expressive compared to Java code while allowing for additional capabilities such as type-safe developers.


In Java, casting a Java object necessitates verifying the variable category corresponding to the action. However, its intelligent casts feature manages to cast verifies in Kotlin, which contains unnecessary casts automatically.


An additional difference is that in Java, every variable can be assigned a null value, which means it corresponds to no object, and hence, referring to it will result in NullPointerExceptions. In Kotlin, however, attempting to assign null values to variables or items by default would result in the code failing to compile.

Data classes: 

In Java, creators must create fields or variables to hold data and the builder and getter/setter services for the areas/variables and several additional functions. 

Meanwhile, the Kotlin development company makes it easier to create classes for data by simply needing the presence of the term “data” in the class declaration.


Additionally, unlike Java programmers, Kotlin developers do not need to go through the frequently irritating and time-consuming process of catching or declaring exceptions. However, this ensures reliable code with appropriate error handling. 

Multiple threads:

The ability to create several background threads in both languages allows for handling time-consuming processes while avoiding issues in the main thread where components of the same application execute in Android Studio. In contrast to Kotlin, which has a clear coroutines solution, this process is complicated in Java.

Android development:

Hire Android developer for better support compared to Java. It contains tools like null safety and Android Extensions, which significantly simplify the process of creating Android applications compared to Java. Android programmers appreciate how the Kotlin compiler makes each Kotlin project considerably more productive.

Does Kotlin Have a Future?

Yes, Over the past few years, it has increasingly impacted the IT industry. In reality, some significant online portals, such as Basecamp, Flipboard, and Pinterest, already use it to be supported by the primary frameworks. 

Recent Google support has been the unquestionable evidence that it has a promising future and the strength to compete with it.

What are the Business Benefits of Kotlin?

  • Because of its compatibility with it, adoption carries just a little risk.
  • Developers can learn it quickly because the learning curve and code review process are simple.
  • They make up a robust customer service team with a good track record. Therefore, there is no downtime.
  • It combines procedural and functional programming.
  • Businesses can use it for server-based, client web, Android, or any other type of development.

Kotlin vs. Java: Which is Better for Android Development?

The answer isn’t always apparent if you’re trying to decide between Java and Kotlin for Android development. Due to several circumstances, one may be more suited to your needs than the other.

There are numerous features that Kotlin offers that Java does not. For instance, Kotlin features built-in null safety, allowing you to avoid troublesome NullPointerException issues. Lambdas and data classes are also supported, which can help your code be more transparent and more expressive.

The Kotlin language does have significant errors, too. For instance, the Android community does not promote it as much as Java. If you want to use Kotlin to develop code, specific bugs still need to be worked out because it is a relatively recent language.

So, Kotlin or Java, which should you pick? Kotlin might be the way to go if you’re beginning a new project from scratch, especially among the Android devs. Even if Java code can be called from Kotlin, it may be advisable to stick with it for the time being if you’re working on an existing project created in that language.

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Wrapping It Up

While it’s necessary to understand the importance of testing and quality assurance in the IT and software sectors, it doesn’t appear that either Java or Kotlin will soon become obsolete. Kotlin is a powerful, high-performance programming language that is also very adaptable. 

Long-standing powerhouse Java has a sizable community. One thing is specific regarding which programming language is superior: it is probably where the developing resources available have the most excellent experience. So, Hire Kotlin app Developer wisely.


  1. Can I mix Kotlin and Java within the same project?

Yes, you may use Java and Kotlin together in the same project. It allows a progressive switch to Kotlin without requiring a total rewrite.

  1. Which language has better tooling and IDE support?

Both Java and Kotlin have strong IDE support and tools. However, Kotlin offers advantages like null safety and simple syntax that might improve the development environment in IDEs that support it.

  1. What is the difference between Kotlin and Java?

Compared to Java, Kotlin is a more up-to-date and efficient programming language. Providing features like null safety, extension functions, and clever type inference helps reduce boilerplate code and improves code readability.

  1. What is null safety, and how does it benefit app development in Kotlin?

Kotlin has a feature called null safety, which helps prevent null pointer exceptions, a common cause of errors in Java. Runtime crashes are less likely since they perform secure checks on nullable variables.

  1. Can I switch from Java to Kotlin midway through a project?

Yes, Switching from Java to Kotlin while working on a project is possible. The gradual transition is possible because of Kotlin’s compatibility without affecting the project’s development cycle.


Jinesh Shah



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