Why is it allowed to declare a variable in a for loop?

Question

I'm a student currently learning java at school (Beginner) and I was wondering about something.
I have a basic knowledge of coding from other languages and I don't understand a particular thing in Java.
If I were to declare a variable (let's use an int as a example) inside a loop wouldn't that mean that I'm declaring the same variable over and over?

This is what I mean:

for (int i = 0; i < 3; i ++) {
    int x = 5;
}

Isn't it the same thing as this? (This one is incorrect)

int x = 5;
int x = 5;

If not, Why? Both of them are / declare the same variable twice, though I know that in loops the variable is local and can't be used outside of the loop (I don't think thats the issue though).
I also know that you can't declare the same variable twice so I don't understand how the first example is legal.

Thanks so much :D

This Question has be solved, Thanks to everyone that helped :D

Answer 1

for (int i = 0; i < 3; i ++) {
    int x = 5;
}

is actually equivalent to:

{
    int x = 5;
}
{
    int x = 5;
}
{
    int x = 5;
}

Each x variable is declared in a separate scope.

Answer 2

scope is in one iteration, after end of loop, scope doesn't exist.

simple example:

for (int i = 0; i < 4; i++) {
            int x = 0;
            System.out.println(x);
            x++;
        }


output:
0
0
0
0