How to use Fernflower decompiler?

Questions

How to use Fernflower decompiler? https://github.com/JetBrains/fernflower#

Answer

1. Run git clone https://github.com/JetBrains/fernflower.git or use IntelliJ IDEA to clone the project from github.

2. Open the project in IntelliJ IDEA.

3. Use the Gradle task jar via Gradle tool window to generate a jar file, or run the command below For Windows: ./gradlew.bat jar For Linux/macOS: ./gradlew jar

4. build/libs/fernflower.jar will be generated, and either put the fernflower.jar into any a single directory, or use it here via Terminal

5. Run java -jar fernflower.jar target-jar-file.jar output-directory . For example:

   java -jar fernflower.jar java-decompiler-261.24374.151.jar ./decompiled/
   

As a result, after unzipping the decompiled jar file (it will generate a jar file too), the .class files are decompiled to .java files.