Install javahelp2-doc by entering the following commands in the terminal:
sudo apt update sudo apt install javahelp2-doc
Description:
Java based help system - contains Javadoc API documentation
The JavaHelp system is an online help system that developers can use to add online help to their Java platform applications. The JavaHelp system provides developers and authors with a standard, fully featured, easy to use system for presenting online information to Java application users. The JavaHelp system consists of a fully featured, extensible specification and API, and a reference implementation of that specification and API that is written entirely in the Java programming language. The JavaHelp system reference implementation, based on the Java Foundation Classes (JFC, also known as Swing), provides a standard interface that enables both application developers and authors to add online help to their applications. . This package contains Javadoc API documentation.
Homepage: http://javahelp.java.net
Version: 2.0.05.ds1-9
Section: universe/doc