The following text was written to the standard output stream when the ShapeThings.java program was executed from IntelliJ.
/usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -javaagent:/opt/intellij-idea-community/lib/idea_rt.jar=44139:/opt/intellij-idea-community/bin -Dfile.encoding=UTF-8 -classpath /home/dmitche7/IdeaProjects/CS1/out/production/CS1:/home/dmitche7/Desktop/SimplePainter.jar:/home/dmitche7/Desktop/SimpleComposer.jar:/home/dmitche7/Desktop/jfugue-4.0.3-with-musicxml.jar shapes.ShapeThing square = Square: side=400.0 area of square = 160000.0 perimeter = 1600.0 disk = Circle: radius=200.0 diamond = Square: side=282.842712474619