The following text was written to the standard output stream when the HelloWorldDemo.html 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=43671:/opt/intellij-idea-community/bin -Dfile.encoding=UTF-8 -classpath /home/rpirong/IdeaProjects/CS1/out/production/CS1:/home/rpirong/SimplePainter.jar:/home/rpirong/SimpleComposer.jar:/home/rpirong/jfugue-4.0.3-with-musicxml.jar greetings.HelloWorld Hello world! Process finished with exit code 0