For instance, IntelliJ and Android Studio allow users. Kotlin is an open-source programming language that runs on the Java Virtual Machine (JVM). Kotlin has been designed from the beginning to fully interoperate with Java, and both JetBrains and Google have pushed in that direction. This is where things become… complicated. JetBrains announced Kotlin in February 2016. ![]() Kotlin’s “internal” Modifier as Seen From Java In the above example, the Foo class will only be accessible from a particular Maven module (or equivalents for other build tools). Introducing Kotlin’s “internal” Modifierįor those that do not know, internal modifier restricts the visibility of an element to a particular module: internal class Foo So… I wonder how Kotlin’s internal classes are represented in and seen from pure Java then? It’s not surprising since it was built on top of the JVM and a lot of its syntax sugar is actually implemented by using standard Java features!įor example, if we define an extension method on a standard String class, underneath it’s just a standard static method: fun String.asHelloWorld() : String = "Hello $this" ![]() Kotlin features almost excellent compatibility with Java.
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