Where can i get these multiple questions witH proofs?

Question

java questions with proofs

Answer 1

Explain the question further.
You can ask here and emulate results on a public script, and you can ask as many times as you need to. Now, to emulate all posibilities, you need to go to the specific environment you'll work on. Try online courses, or even particular classes if you don't work in a group where you can ask. If it's something harder about a current project, you can just git it up, and ask both here and in stackoverflow sharing the link.
This is the most accurate answer I can give until you elaborate.