How to convert a Kotlin source file to a Java source file

Question

I have a Kotlin source file  but I want to translate it to Java   How can I convert Kotlin to Java source

User · Answer

As  louis-cad mentioned  Kotlin source -  Java s byte code -  Java source  is the only solution so far   But I would like to mention the way  which I prefer  using Jadx decompiler for Android   It allows to see the generates code for closures and  as for me  resulting code is  cleaner  then one from IntelliJ IDEA decompiler   Normally when I need to see Java source code of any Kotlin class I do     Generate apk    gradlew assembleDebug Open apk using Jadx GUI  jadx-gui   app build outputs apk debug app-debug apk   In this GUI basic IDE functionality works  class search  click to go declaration  etc   Also all the source code could be saved and then viewed using other tools like IntelliJ IDEA

User · Answer

open kotlin file in android studio go to tools -  kotlin - kotlin bytecode  in the new window that open beside your kotlin file   click the decompile button   it will create java equivalent of your kotlin file

User · Answer

you can go to Tools   Kotlin   Show kotlin bytecode

User · Answer

I compile Kotlin to byte code and then de-compile that to Java  I compile with the Kotlin compiler and de-compile with cfr   My project is here   This allows me to compile this   package functionsiiiandiiilambdas functions p01tailiiirecursive  tailrec fun findFixPoint x  Double   1 0   Double           if  x    Math cos x   x else findFixPoint Math cos x     To this   package functionsiiiandiiilambdas functions p01tailiiirecursive   public final class ExampleKt     public static final double findFixPoint double x        while  x    Math cos x           x   Math cos x             return x         public static    bridge       synthetic    double findFixPoint default        double d  int n  Object object        if   n  amp  1     0          d   1 0            return ExampleKt findFixPoint d

User · Answer

To convert a Kotlin source file to a Java source file you need to  when you in Android Studio      Press Cmd-Shift-A on a Mac  or press Ctrl-Shift-A on a Windows machine  Type the action you re looking for  Kotlin Bytecode and choose Show Kotlin Bytecode from menu       Press Decompile button on the top of Kotlin Bytecode panel       Now you get a Decompiled Java file along with Kotlin file in a adjacent tab

User · Answer

You can compile Kotlin to bytecode  then use a Java disassembler    The decompiling may be done inside IntelliJ Idea  or using FernFlower https   github com fesh0r fernflower  thanks  Jire   There was no automated tool as I checked a couple months ago  and no plans for one AFAIK

User · Answer

Java and Kotlin runs on Java Virtual Machine  JVM    Converting a Kotlin file to Java file involves two steps i e  compiling the Kotlin code to the JVM bytecode and then decompile the bytecode to the Java code   Steps to convert your Kotlin source file to Java source file    Open your Kotlin project in the Android Studio  Then navigate to Tools -  Kotlin -  Show Kotlin Bytecode       You will get the bytecode of your Kotin file  Now click on the Decompile button to get your Java code from the bytecode

User · Answer

As  Vadzim said  in IntelliJ or Android Studio  you just have to do the following to get java code from kotlin    Menu  gt  Tools  gt  Kotlin  gt  Show Kotlin Bytecode Click on the Decompile button Copy the java code   Update   With a recent version  1 2   of the Kotlin plugin you also can directly do Menu  gt  Tools  gt  Kotlin - gt  Decompile Kotlin to Java

[java] How to convert a Kotlin source file to a Java source file

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