The array is not reversing

According to this piece of code I must get a reverse array but I’m still getting the non-reversed.

public class Reversing_array {
    public static void reverse_arr(int arr[]) {
        int n = arr.length - 1;
        for (int i = 0; i < arr.length; i++) {
            int temp = arr[i];
            arr[i] = arr[n - i];
            arr[n - i] = temp;
        }
    }

    public static void main(String[] args) {
        int arr[] = { 10, 20, 30, 40, 50 };
        reverse_arr(arr);
        for (int i = 0; i < arr.length; i++) {
            System.out.println(arr[i]);
        }
    }
}

I performed a dry run of it, but still didn’t reached to the mistake.

>Solution :

If you have an array of four elements, and run swaps four times:

1 2 3 4 // initial state
4 2 3 1 // first swap
4 3 2 1 // second swap <- this is what we want
4 2 3 1 // third swap  <- but we kept going...
1 2 3 4 // fourth swap <- and going...

You want to swap arr.length / 2 times to avoid re-swapping back into the original order. If the length of the array is odd, this will avoid swapping the middle element, but that’s okay.