Method swap

Java/Array/Sort012.java:63–70

(int [] arr, int i, int j)

        return arr;
    }
    public static void swap(int [] arr, int i, int j) {
        // i = number to be swapped.
        // j = number with which it is swapped.

        int temp = arr[i];
        arr[i] = arr[j];
        arr[j] = temp;
    }


    public static int [] sort012threePointerApproach(int [] arr) {