This is also the reason why you can, in a way, get Java code back from Kotlin (although the output is not completely desired). This is the reason we can convert Java code to Kotlin and mix Java and Kotlin code together.
Kotlin is a statically-typed programming language that works on Java Virtual Machine and compiles into JVM compatible bytecode. java file and remove the unnecessary code. The process to convert Kotlin to Java in IntelliJ IDEA is the same. Checkmark JVM 8 Target and click on the Decompile button to get the Java code. Navigate to Tools > Kotlin > Show Kotlin Bytecode. At the moment, this is the only way to convert Kotlin code to Java. Open the Kotlin file that should be converted to Java. Basically you just copy/paste some Java code. Yes, it has a lot of unnecessary code that was not present in the original Java code, but that is the case with decompiled bytecode. The Scala plugin is free though and comes with the community edition of Intellij for anyone wanting to try it out. java file will be generated, containing a decompiled Java bytecode from Kotlin code: If you have to absolutely convert your Kotlin code to Java, click on Tools | Kotlin | Show Kotlin Bytecode in the menu:Īfter clicking on Show Kotlin Bytecode, a window will open with the title Kotlin Bytecode:Ĭlick on Decompile and a. kt.Īfter converting to Kotlin, this is what we have:Ī Kotlin file can be converted into Java, but it’s better if you can avoid it or find an alternative way to do it. Your Java file will be converted into Kotlin, and the extension will now be. Now, in the main menu, click on Code menu and choose the Convert Java File to Kotlin File option. Īfter that, we’ll see the file SampleKt.java: import kotlin.In your IntelliJ IDE, open the Java file that you want to convert to Kotlin. Once we have the JAR file, the command to run is: java -jar fernflower.jar SampleKt.class. We can get the fernflower.jar by downloading the project and running the Gradle build. Now, we need to decompile this file to Java.
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