There's no way this is 6kyu.

I don't think you need the str() here..

This is much shorted and easier to read.
I feel dumb.

What did you use re for?

Is this better? I'm not sure about it, if there are any issues or suggestions please tell me.

Should I use a different answer as a "correct code" ?

Edit: I am new to publishing

You don't have to use Integer.MAX_VALUE here.
I'm not sure about efficiency but it makes more sense to assign the variable smallest to args[0].

int max=Integer.MIN_VALUE,min=Integer.MAX_VALUE;

I believe it's better to assign them both to nums[0].
I'm not sure if it uses less memory but it's more readable and logical.