KotUniL
· "KotUniL (Kotlin Units Library) is a library for processing all units of SI base and derived units (see https://en.wikipedia.org/wiki/International_System_of_Units), currencies, etc.
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 kotunil-iosarm64-4.1.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.