Fika
· Fika is a Swedish word that means "Coffee with something to it", and
that is exactly what this project is about - general purpose modules
for various Java projects.
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 fika-1.0.5.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.