I've played with processing and p5. Processing is built somewhat on Java, but its hard to tell. You could compile it into stand alone applications. Its also hard to google. p5.js is slower but much more accessible ( everything ends up being ported to Javascript). Its fun because its easy to make interactive programs.

the p5.js has an account system and an online editor, which is fun to play around with, but not needed. Its got fun interactive examples too:https://processing.org/examples

I stumbled across it when someone left Dan Shiffman's book "the nature of code" on our buildings swap table. https://natureofcode.com/

Dan has a youtube channel. Its kinda a weird mix of children's themes and advance math. The tutorials are great however.

https://thecodingtrain.com/