HTTP2Check should be run on Java 11 or higher. It may be run directly in a
command-line.
./HTTP2Check https://github.com/well-grounded-java/resources
Ch01.java should be run on Java 17 and requires classes from the var
directory. It is simplest to load and run this example in an IDE.
SwitchItUp.java should be run on Java 17. As it has no dependencies on other
classes it may be compiled and run at the command-line. It is also easily
runnable when loaded in an IDE.
javac SwitchItUp.java
java SwitchItUp