Class Decompiler GUI

A desktop decompiler tool built with Java Swing + CFR/Procyon/Fernflower/Vineflower + ASM.

Features

• Drag and drop a JAR or ZIP
• Browse package folders and class files in a tree
• Click a class to view decompiled source
• Choose the decompiler backend from 配置 > Decompiler
• Edit decompiled source directly in the right panel
• Search decompiled text across all classes by string or method name
• Save edited source by fully qualified name into the working source tree
• Try to rebuild the edited class with the JDK compiler and write it back into the loaded archive workspace
• Right click inside the code editor to inspect bytecode for the method at the caret
• Edit and save bytecode text snapshots for the current method or whole class
• Export all decompiled sources into a folder and package them as a sources.jar
• Save the current modified archive back out as a new jar

Build

mvn package

Run

java -jar target/class-decompiler-gui-1.0.0-jar-with-dependencies.jar

Main Output

The runnable desktop package is:

target/class-decompiler-gui-1.0.0-jar-with-dependencies.jar

Workflow

1. Drop a target jar or zip into the window.
2. Select a class on the left.
3. Edit the decompiled code on the right.
4. Click Save Source to persist the edited source and attempt a class rebuild.
5. Enter a keyword in the search box to search all decompiled source text.
6. Click a search result to jump to the matching class and line.
7. Right click in the editor and choose a bytecode view action when needed.
8. Click Save Current Archive to package the modified working archive as a new jar.
9. Click Export Sources to export all source files and package a source jar.

Notes

• Decompiled source editing is stored in the archive working source tree.
• Bytecode editing currently saves editable bytecode text snapshots for the selected method or class.
• Class rebuilding uses the JDK built-in compiler when available.
• Fernflower is copied to target/decompiler-libs during packaging so it can run isolated from Vineflower on Java 8.
• Vineflower is disabled automatically when the app runs on Java 8 because the bundled Vineflower version requires Java 11+.