Practical Java: Sending Data to an Arduino, Part 2 (The Implementation)

We need to send information, in this case a countdown sequence, to an Arduino from a Java program on a PC (macOS, Windows, etc.). We're assuming that you've already got a C++ program running on the Arduino (or similar) microcontroller board. Let's plan out an approach to a thread-based Java program that sends a byte of information at a time at regular (1 second) intervals.

Thanks to Richard Robinson for the help in creating this lab project.