Īfter that, we’ll see the file SampleKt.java: import 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. Outdated, unsupported and does not decompile correctly Java 5 and later.Now, we need to decompile this file to Java. Probably, this is the most popular Java decompiler, but primarily of this age only. Free, no source-code available, jad download mirror Author: Pavel Kouznetsov Supports Java up to version 6 (Annotations, generics, enums) Very promising analytical Java decompiler, now becomes an integral part of IntelliJ 14. Java 8 Lambdas and method references (i.e., the :: operator).Local classes (both anonymous and named).Handles language enhancements from Java 5 and beyond, up to Java 8, including: Has its own visual interface and plugins to Eclipse and IntelliJ. It'll even make a decent go of turning class files from other JVM langauges back into java!įree for non-commercial use only, Author: Emmanuel Dupuy Java 14: 'instance of' pattern match and 'Record types'.Java 12: Kotlin style 'switch expressions'.Now, in the main menu, click on Code menu and choose the Convert Java File to Kotlin File option.

Regularly updated, CFR is able to decompile all the modern Java features: In your IntelliJ IDE, open the Java file that you want to convert to Kotlin. This free and open-source decompiler is available here: Author: Lee Benfield Here's a list of decompilers presented on this site: Now, in the main menu, click on Code menu and. class file and pre-process it, so it becomes JDK 1.3 compatible, and then run Jad over it (one of those older, but better decompilers).īut recently, a new wave of decompilers has forayed onto the market: Procyon, CFR, JD, Fernflower, Krakatau, Candle. In your IntelliJ IDE, open the Java file that you want to convert to Kotlin. The only so-so working solution was to take the.

Additionally, ExtendsClass also functions as an online Kotlin to Java converter. You can simply input or drag and drop/copy and paste your code in the editor, select convert to compile your source code, and then Download File or Copy to clipboard your converted code. The obsoleteness was typically proved by the fact that they can only decompile JDK 1.3 bytecode. You can convert your Java code to Kotlin online in three quick steps. Until recently, you needed to use a Java decompiler and all of them were either unstable, obsolete, unfinished, or in the best case all of the above.

Online kotlin to java