ArchGuard
· ArchGuard is a architecture governance tool which can analysis architecture in container, component, code level, create architecture fitness functions, and anaysis system dependencies..
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window api-examples-0.1.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.