Can I use arg instead of args?

Question

When I write a program, I accidentally put arg instead of args, and it still runs. There is no error.

Answer 1

Technically you're just naming a variable there.

We usually name the variable args (which is short for "command line arguments"), but you could name it any other legal identifier (for example, String[] elephants, but that would be silly!).

So yes, your program will still work if you name the variable arg instead of args, but it's better to follow standard convention and make it plural.