org.refcodes:refcodes-io-ext
· The refcodes-io-ext artifact extends the types and implementations as
defined by the refcodes-io artifact with additional (extended)
functionality.
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 refcodes-io-ext-3.2.8.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.