Cavaj Java Decompiler for Windows

Purpose and summary

Cavaj Java Decompiler is a free Windows utility that reconstructs Java source code from compiled bytecode. It reads CLASS files and can extract readable .java files from archives and applets. The program runs on its own — there’s no requirement to install a separate Java runtime for it to work.

Core capabilities

• Rebuilds source code from compiled .class files, producing human-readable Java code.
• Opens and extracts code from JAR and ZIP archives as well as Java applets.
• Presents decompiled output that aims to be accurate and free from obvious errors.
• Focuses on a narrow set of tasks and performs them reliably rather than providing a broad toolset.

Interface and workflow

• A clear two-pane layout shows a folder/file tree on one side and the decompiled source on the other, making navigation straightforward.
• The standalone design and uncluttered controls make the tool approachable for users with varying levels of experience.
• Because it concentrates on decompilation, there are no built-in features for compiling or running Java programs.

If you need to build or run Java

If your goal is to compile and execute Java code rather than inspect or restore it, consider installing the Java Development Kit (JDK), which provides compilers, runtime tools, and a full development environment.