Answer 1

You can start with Sololearn Java tutorial.
These threads may be helpful if you want to learn java.
https://www.sololearn.com/discuss/580291/?ref=app
https://www.sololearn.com/discuss/1448358/?ref=app
https://www.sololearn.com/discuss/848669/?ref=app
https://www.sololearn.com/discuss/22762/?ref=app

Also this is Q/A section where you can ask programming related questions. Don't link, other's codes in your question.