jd-gui

JD-GUI displays Java source reconstructed from .class files. Part of the Java Decompiler project alongside JD-Eclipse and JD-Core.

Source

• java-decompiler.github.io
• JD-GUI releases

Main features

• Drag-and-drop .class files or JARs
• Browse methods and fields in reconstructed source
• Map stack trace line numbers back to decompiled code
• Supports Java 5+ features (generics, annotations, enums)
• Works with output from dex2jar

Related tools

Tool	Role
JD-GUI	Standalone graphical viewer
JD-Eclipse	Eclipse plugin for debugging without sources
JD-Core	Library that reconstructs source from bytecode

All released under GPLv3.

Typical workflow

1. d2j-dex2jar.sh app.apk → app-dex2jar.jar
2. Open JAR in JD-GUI
3. Inspect classes, export source if needed