so we override it when declared new Object, right?

Answer 1

I think 'it' is an anonymous class?
Maybe you should read this:
https://docs.oracle.com/javase/tutorial/java/javaOO/anonymousclasses.html
If you don't understand the tutorial, let us know what you don't understand.

Answer 2

here is an example that you may want to check to see difference or understand the meanings of overriding and overloading https://code.sololearn.com/c0awDMpDLukF/?ref=app

Answer 3

What is "it"?

Answer 4

anonymous class, sorry for my miss.