This is also the reason why you can, in a way, get Java code back from Kotlin (although the output is not completely desired). Click OK, configure Kotlin in the project. Then, a confirmation dialog appears that states that the project will configure into Kotlin. Figure 6 Converting the Gradle file from Java to Kotlin. This is the reason we can convert Java code to Kotlin and mix Java and Kotlin code together. You could click the app directory and use the shortcut Ctrl+Alt+Shift+K or click Code Convert Java File to Kotlin File from the top menu. 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. At the moment, this is the only way to convert Kotlin code to Java.

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. 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. In your IntelliJ IDE, open the Java file that you want to convert to Kotlin.

Kotlin to java converter