Bro, Kotlin is a modern JVM language that replaces Java. It simplifies coding with features like null safety, extension functions, and coroutines. It’s also Android’s official language, but it’s not just for mobile—it’s used in backend and multiplatform projects too. Compared to Java, it has less boilerplate code and fewer errors. What advantages stand out in projects that choose Kotlin?
What is Kotlin and why is it preferred?
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I tried it out recently on a simple mobile project, man. When I wrote the function in Java, it took 100 lines of code, but in Kotlin, it dropped to 30 lines. And thanks to null safety, runtime errors decreased a lot—I felt much more at ease, especially when communicating with the backend.
Kotlin’s obvious advantages over Java were something I noticed in my early projects too. Especially with null safety, I no longer had to deal with NullPointerExceptions at runtime—I was catching and fixing them at compile time. Extension functions also significantly improve code readability by eliminating the need for repetitive extension methods.
I also use Kotlin for backend development, and here’s what I’ve observed: Java classes that take up 100 lines are cut in half in Kotlin. Writing asynchronous code with coroutines is both simple and performant. I think the benefits aren’t limited to Android—this is a serious advantage for any JVM project.
Comparing it to C++, Kotlin is a serious relief, honestly. Instead of struggling with pointers and memory leaks in C++, null safety puts an end to the `NullPointerException` headaches. Extension functions let you add methods like `isEmail()` directly to `String` instead of writing long regex patterns in C++ on the desktop, and all without runtime overhead. With coroutines, you escape callback hell and can write asynchronous code as if it were synchronous, whereas in C++ dealing with `Future`s and waiting for `std::async` to complete was exhausting.
Build time also stands out. A C++ project that takes 10 minutes to compile is reduced to just 2 minutes in Kotlin because the JVM bytecode is compiled directly. Compared to Java, Kotlin also offers less boilerplate, more readable code, and better IDE support (like IntelliJ’s performance with Kotlin), making daily development much lighter. Honestly, since I started using Spring Boot + Kotlin for backend development, I can’t even imagine going back to Java.