Install libfreehep-swing-java by entering the following commands in the terminal:
sudo apt update sudo apt install libfreehep-swing-java
Description:
FreeHEP swing extensions
This library contains a collection of utility classes built on top of the Java Swing framework. It contains new Swing elements, extensions of other elements already in Swing and other wrapper classes used to facilitate the use of the Swing library. It is mainly used by other libraries within the FreeHEP project. . FreeHEP is a collection of Java libraries used in High Energy Physics.
Homepage: http://java.freehep.org/
Version: 2.0.3-5
Section: universe/java