Request recommendation for running Java, Python online

[gdant]

My use is for learning purpose hence above would be very useful.

codeanywhere seems good as you mentioned. It's similar to koding.com which went paid.

Could you pls suggest if it's feasible to save (download) the program/code files from codeanywhere?

Yes, you can download files from there. Moreover, you can make project with multiple files.
Yes, it is very much similar to Koding.com but codeanywhere.com gives at least free option with limited resources which is more than enough for normal usages.