If you have another reason, you can indicate it in a comment!

Another reason can be the case where we don't understand a piece of kotlin code, and we hope to understand it in java. We can also consider the fact that we want to remove Kotlin to keep only Java source code. For exemplet to integrate some feature in Java (instead of Kotlin), or to investigate a performance issue. Why convert Kotlin to Java? There can be different reasons for doing this conversion. The currently released version is 1.6.10 (published on December 14, 2021). Is Kotlin hard? It is not a complicated language, it is inspired by existing languages such as C#, Groovy, Java, JavaScript and Scala. Native ? Kotlin/Native is a technology for compiling Kotlin code to native binaries which can run without a virtual machine! It is still in beta. When to use kotlin? Kotlin can be used for any kind of development, be it client-side (With JavaScript), server-side (JVM), Android, embedded systems (With Kotlin/Native), mobile applications. It has been developed under the Apache 2.0 license and perfected for more than 5 years by the company JetBrains. It is designed to interoperate fully with Java, but it also targets Android, JavaScript and Native. This language is intended to be concise (Rough estimates indicate approximately a 40% cut in the number of lines of code) and 100% interoperable with the Java programming language. Kotlin is a general-purpose programming language with type inference.

Kotlin to java online converter