No return type is specified for the function.If needed, it would be declared as args : Array. Since Kotlin 1.3, the array-of-strings parameter for main is not required and may be omitted if not used.Kotlin also doesn't support the static modifier, but it isn't needed in this case because main is a top-level function. While Kotlin has visibility modifiers, the default is public and can be omitted. main is a top-level function that is, Kotlin functions do not need to be nested within a class."Hello, world!" in KotlinĪs simple as it is, this example reveals key differences from Java. Listing 1 shows the obligatory "Hello, world!" function written in Kotlin. Top-level objects and the Singleton pattern.In this article I introduce eight features of Kotlin that I believe Java developers will be excited to discover. In many ways, Kotlin is what Java might look like if it were designed today. It targets several platforms, including the JVM, and is fully interoperable with Java.
Kotlin is a modern, statically-typed programming language that features both object-oriented and functional programming constructs. The language is free and open source, developed by JetBrains with Andrey Breslav serving as its lead language designer. Kotlin was announced in 2011, but the first stable release, version 1.0, didn't appear until 2016. If that's the case, this article could help you decide. With the recently announced decision to make Kotlin the preferred language for Android, you may be wondering if it's time to start learning a new programming language. Officially released in 2016, Kotlin has attracted a lot of attention in recent years, especially since Google announced its support for Kotlin as an alternative to Java on Android platforms.
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