The following text was written to the standard output stream when the ShapesThing.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=45135:/opt/intellij-idea-community/bin -Dfile.encoding=UTF-8 -classpath "/home/akyaw/IdeaProjects/CS1/out/production/CS1:/home/akyaw/Downloads/Programming lab 2/SimplePainter.jar:/home/akyaw/Downloads/Programming lab 2/SimpleComposer.jar:/home/akyaw/Downloads/Programming lab 2/jfugue-4.0.3-with-musicxml.jar" shapes.ShapesThing square = square: side=400.0 area of square = 160000.0 perimeter of square = 1600.0 diagonal of square = 565.685424949238 disk = Circle: radius=200.0 area of disk = 125663.70614359173 perimeter of disk = 1256.6370614359173 diamond = Square: side=282.842712474619 area of diamond = 80000.0