Exploring Kotlin: Features, Compatibility, and Advantages for Mobile Development

In the 2017 Google I/O keynote, Kotlin was announced as an officially supported language for Android, sparking excitement among developers who wondered whether Java would be replaced.

The author reflects on the hype, compares Kotlin’s emergence to Swift, and explains the decision to study Kotlin using existing Java and Scala skills.

Kotlin can compile to JVM bytecode, JavaScript (targeting ECMAScript 5.1), and native binaries via Kotlin/Native, which currently supports macOS, Linux, Raspberry Pi, and iOS through LLVM cross‑compilation.

Key language features highlighted include:

Immutability: variables declared with val are read‑only, while var denotes mutable variables; Kotlin also provides immutable collections.

Less boilerplate: data classes automatically generate getters, setters, equals, hashCode, and toString, reducing code compared to Java POJOs.

Null‑safety: non‑nullable types prevent NullPointerExceptions by default, with the safe‑call operator ? , Elvis operator ?: , and the non‑null assertion !! for explicit handling.

Functional programming support: higher‑order functions, lambdas, and immutable data structures.

The article also showcases Kotlin’s seamless Java interoperability, noting that Kotlin is 100 % compatible with existing Java libraries and can be used alongside frameworks like GSON and Retrofit.

In conclusion, Kotlin is presented as a mature, modern language that offers Android developers a powerful alternative to Java, especially with its multi‑platform capabilities and concise syntax.