How to open Javadoc JAR file in web browser
- Rename the file exercises-fpinscala_2.13-0.6.4-javadoc.jar to exercises-fpinscala_2.13-0.6.4-javadoc.zip
- Use your favourite unzip tool (WinRAR / WinZIP) to extract it, now you have a folder exercises-fpinscala_2.13-0.6.4-javadoc
- Double click index.html will open the index page on your default web browser.
How to generate Javadoc from a source JAR?
Running the command javadoc:
javadoc --ignore-source-errors -encoding UTF-8 -sourcepath "exercises-fpinscala_2.13-0.6.4-sources.jar" -d "exercises-fpinscala_2.13-0.6.4-javadoc" -subpackages 
