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Java-vs.-Kotlin-Which-is-the-Better-Option-for-Android-App-Development
  • Industry: Mobile App Development
  • Timeline: Jul 08, 2019
  • Writer: Saima Naz

Java vs. Kotlin: Which is the Better Option for Android App Development

The Kotlin community is expanding. Google acknowledged Kotlin this year, making it Android’s second official language. Android developers finally have the pragmatic and intuitive language they have been waiting for.

But the big problem for developers is whether they should learn Kotlin only or Java as well.

Android development has evolved significantly, with Java and Kotlin emerging as the two most popular programming languages. Choosing between them depends on project requirements, scalability, and developer expertise. With professional support from mobile app development services, businesses can build high-performance Android applications tailored to their needs.

Key Takeaways:

  • Java remains a reliable and commonly used programming language for Android app development.
  • Kotlin is a modern programming language supported by Google that improves efficiency and minimizes repetitive code writing.
  • Choosing between them depends on whether the priority is modern efficiency or established reliability.

Kotlin VS Java: Which Is Better for Android App Development?

There is no denying that Java has its place to compete, but with time, we all need some advancement, so if we can find it, we always look for a better option. Each language has its pros and cons, with which you have to decide which language you can utilize well.

Java

Sun Microsystems developed Java, an object-oriented programming language. It is currently owned by Oracle. It was launched in 1991, and as an old language, it has much more to offer to you. Even Java can offer you more job opportunities, as you don’t want to develop Android applications all the time. It can let you open your wings and fly to another field. Because Android itself is Java-based, mobile app development firms have always preferred Java over any other language. It becomes essential to see why Java is considered the first official language for Android app development.

Kotlin

Kotlin launched in 2016, and at that time, all developers needed a modern language for Android development that could contribute to Java’s features and help in mobile development. JetBrains developed Kotlin, an open-source language based on the JVM. It can be compiled and interpreted with Java due to its statically typed, Java-based language. Developing Android Apps with Kotlin allows developers to update old Java applications readily, and you can effortlessly carry their work from Java to Kotlin.

Pros and Cons

After the brief introduction of both languages, now let’s take a look at what merits and demerits Java and Kotlin have in store for you.

Pros of Java App Development

  • Java Android app development is easy to understand and learn.
  • Compatible with native cross-platform app development.
  • Android itself is dependent on Java.
  • Write it once, run everywhere. Java is the most versatile language. It provides developers the ability to reuse code and operate on various operating systems.
  • Java has a faster build-up process compared to Kotlin.
  • Java consists of an ecosystem that is mainly open source due to Google’s adoption of the JVM for Android.
  • Java has a Gradle-oriented accelerated assembly and thus decreases overheads while developing big projects.
  • Java applications are predominantly compact and way too light compared to Kotlin. This is justified by the fact that Kotlin Development induces complicated structures that decrease overall efficiency.

Cons of Java App Development

  • Comparatively slow and require extensive memory.
  • Being verbose, Java Development has more code drafting demands, and this accounts for bugs along with errors.
  • Limitations, as Java poses, lead to Android API design problems.

Pros of Kotlin App Development

  • Kotlin eliminates the need for raw data types and leads to improved code.
  • Switching from Java to Kotlin is too easy, and all you need to do is install your plugin.
  • It has no room for ClassCastException to minimize verbosity and leverage code security.
  • Smart expanded features enable developers to build better APIs.
  • Brevity: Although readability is above precision, Kotlin still has the concision that Java lacks. Its nature also decreases development overhead and is a bonus for all mobile app development businesses. Where a Java code requires 10 lines of code for a calculator function, Kotlin requires half. In addition, Kotlin Development does not compromise comprehension while achieving brevity.
  • Interoperability: Right from the beginning, Kotlin developers concentrate on leveraging performance by enhancing existing knowledge and further introducing features that make it the top choice for all Android software development companies. Simple modules written in Kotlin work seamlessly with Java code. Moreover, the Kotlin compiler eliminates bytecode and fuses two languages in the same project.
  • Built-in Null Safety: Kotlin has built-in null safety. The renowned NullPointerException is mainly responsible for Android development errors. Android uses null to depict the absence of a value, but null can readily ruin an app. Kotlin solves this issue by integrating inherent null safety. This addition saves developers from writing additional code to work around the problem.

Cons of Kotlin App Development

  • It induces complicated structures and thus decreases overall speed.
  • Auto-complete features are less efficient compared to the efficiency of Java projects.
  • Kotlin has a restricted community, so if you’re stuck with a bug, you need to take the pain to decode it all by yourself.

Will Kotlin Oust Java for Android Development?

Java is a reputable programming language with extensive open-source tools and libraries to benefit developers. With that said, there is no language without fault, and even Java is subject to complications that can render a developer’s job tedious. If anything, Kotlin will introduce solutions to prevalent headaches in programming and strengthen the Java ecosystem as a whole.

Over time, Kotlin has become a much more stable and congruous development alternative for Android Studio. Some developers also seem to believe that in the coming years, it will oust Java for Android development. Other specialists see that Kotlin and Java coexist without one outweighing the other. For most, the strengths of Kotlin outweigh the setbacks of the language. There are definite constraints within Java that impede the design of the Android API. Kotlin is inherently lightweight, neat, and far less verbose, particularly when it comes to writing callbacks, data classes, and getters/setters.

In other words, it is specifically designed to improve existing Java models by providing solutions to deficiencies in the design of the API, as Android programming is based on the Java programming language. Therefore, addresses numerous weaknesses of Java.

Faster Delivery, Fewer Crashes

Adopting a new development language requires careful consideration. Kotlin delivers two concrete business advantages that justify the switch.

Reduced Project Timelines – Kotlin’s concise syntax means developers write less code to accomplish the same tasks. This readability makes code reviews and updates faster, accelerating time-to-market and reducing overall project duration.

Fewer App Crashes – Less code translates directly to fewer bugs. With a smaller codebase, there is less surface area for errors to hide. Kotlin’s clean syntax also makes bugs easier to spot and fix during development, resulting in more stable applications and lower maintenance costs.

Why Kotlin’s Future Is Secure

One of the reasons is the trust built up around Kotlin owing to Google officially supporting the language. This support will expand the Android app development ecosystem, which will provide companies with improved technical support and other capabilities. Within the Android app development ecosystem,  Kotlin is all set for a promising future. The reduced development and maintenance costs of Kotlin projects are a major advantage for any business, offering strong language features and concise code that guarantees greater performance with quicker turnaround time.

Enterprise Leaders Choosing Kotlin

Major technology companies across multiple industries have already adopted Kotlin in their development environments. Their decisions reflect the language’s proven reliability and performance benefits:

  1. Pinterest
  2. Netflix
  3. Uber
  4. Coursera
  5. Atlassian
  6. Evernote
  7. Prezi
  8. Corda
  9. Gradle
  10. Pivotal

These organizations range from streaming platforms to productivity tools to infrastructure providers, demonstrating Kotlin’s versatility across different business domains.

Kotlin’s Developer-Friendly Features

Kotlin was designed to address Java’s limitations while maintaining compatibility. Here’s how it simplifies development:

Some-Help-for-Developers

 

  • Functional Reactive Programming – Kotlin supports this natively, making it easier to build responsive, event-driven applications.
  • Full Object-Oriented Programming – Kotlin is a pure OOP language, while Java’s OOP implementation is only partial.
  • Invariant Arrays – Kotlin prevents type-safety issues that can occur with Java arrays.
  • Null Safety Built In – Kotlin eliminates null pointer exceptions at compile time, saving debugging hours.
  • Lambda Expressions – Write cleaner, more concise code with inline functions.
  • Smart Casts – Kotlin automatically handles type casting, reducing boilerplate and errors.
  • Simplified Singleton Creation – Kotlin makes singleton objects trivial to implement compared to Java’s verbose patterns.
  • No Checked Exceptions – You avoid Java’s mandatory exception handling boilerplate while maintaining safety.

Java and Kotlin Will Coexist

Comparing programming languages is inherently subjective. The factors that matter most depend on project needs, team expertise, and long-term strategy. Kotlin is built on Java, and the two languages are deeply connected; direct comparison misses the nuance of when each works best.

Many development teams have already made the switch to Kotlin and report measurable improvements. Others continue using Java for Android development. The difference comes down to what each project requires.

Two realities stand out:

  • Java is not disappearing. It will remain relevant for Android development for many years to come.
  • Kotlin is also here to stay. As the language matures, more developers will adopt it. Major companies like Atlassian, Pinterest, Basecamp, and Coursera have already integrated Kotlin into their production apps, signaling confidence in its viability.

The choice between them is not about one replacing the other; it is about matching the right tool to your project’s needs and timeline.

Conclusion:

Both Java and Kotlin continue to shape the future of Android app development, each offering unique strengths for developers and businesses. While Java remains stable, your project goals will ultimately determine the best choice and long-term vision.

Arpatech has the Android expertise to build powerful applications that users love and businesses rely on. Let’s talk.