https://replit.com/ should work as an online sandbox for simple testing, i've heard of but never used https://www.compilejava.net/ . Search for online java IDE for more results. More on reddit.com

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I teach a java programing class virtually, and I have a couple of students that have very limited computing resources. Does anybody know of an online resource that will allow java programing and compiling with multiple files. I know of lots that work great for a single file, just not some that ... More on forum.code.org

It doesn't have to be full blown of course, and console output only would be enough. I'd like it to be able to work on some program parts on any PC which has internet connection. I'm really loo... More on stackoverflow.com