What is the difference between creating an object in Java like this, or like this?

Question

Java

What is up, programmer.

StackOfStrings s;
s = new StackOfStrings(100);

or
StackOfStrings s = new StackOfStrings(100);
I missed this moment, I remember how I met it in a book. And now I often see it, but I don’t catch the difference.

Answer 1

First case:
You declare a StackOfStrings variable named s, but don't initialize it
And only then do it on the second line
Second case:
You declare a StackOfStrings variable named s and initialize it right away
Essentially there is no difference, mostly it's the code design

Answer 2

StackOfStrings s;
System.out.print(s);
s = new StackOfStrings(100);

The only difference is that the variable s cannot be used on the right side of the expression until at least something is assigned to it. The code above won't even compile. There are no differences that would affect the work of the program.