This is also a good place to start ... https://docs.oracle.com/javase/tutorial/java/TOC.html (includes many worked examples and sample code).

W3Schools is also a good site ... https://www.w3schools.com/java/default.asp (includes many useful coding tutorials, including java).

Best regards,
Jonathan

Hi Al, 'Persitence' is exactly the right term to use in the context of implementing code that allows you to store and retrieve your program's state (in this case true/false or on/off). You will need to study Java Object Serialization, an essential topic and well worth the effort. A comprehensive sou...

This solution, taken from an old c|net article has worked for me.

sudo apt-get update
sudo apt full-upgrade
sudo apt-get install -y rpi-chromium-mods

I hope it works for you too )

[Ref. https://www.cnet.com/how-to/update-your ... -features/]

BR, Jonathan