As @Vadzim said, in IntelliJ or Android Studio, you just have to do the following to get java code from kotlin:
Read moreHow do I add IntelliJ Kotlin compiler?
Go to Intellij Preferences -> Build, Execution, Deployment -> Kotlin Compiler . Update Language version and Api version to the one you wish. This should be the accepted answer.
Read moreHow do I set up Kotlin?
To add Kotlin to your project, do the following:
Read moreHow do I find my Kotlin version in IntelliJ?
You can follow these instructions to install the preview version of the Kotlin Plugin for IntelliJ IDEA or Android Studio.
Read moreWhat is Kotlin plugin IntelliJ?
The Kotlin plugin provides language support in IntelliJ IDEA and Android Studio . Getting Started in IntelliJ IDEA. Getting Started in Android Studio. Public Slack. Issue tracker.
Read moreHow do I fix Kotlin not configured?
Important Update
Read moreDo Java libraries work in Kotlin?
Can I call Android or other Java language library APIs from Kotlin? Yes. Kotlin provides Java language interoperability .3 Kas 2020
Read more