Can global variables be used inside a method?

Question

If I declare a variable in main for example an IP address, can I use that address in a method without passing it to the method through the call and having to rename it?

Answer 1

If you declare it in main, it is not global.

You should avoid using global variables if possible.

Answer 2

You will need to stop using global variables ASAP. You will need to achieve a high level of "Encapsulation" by using access specifiers at all times. Find a way that makes sense to have that variable local to your method, whether you pass it as an argument or create it inside the method itself, but don't make it global, that's really bad security practice.

Answer 3

why we prefer local variables?