Write a java method to reverse the elements of an array using recursion. Your method should take an array as an input parameter and return reverse the array

Sure, here is a Java method that reverses an array using recursion:

public class Main {
    static void reverseArray(int arr[], int start, int end) {
        int temp;
        if (start >= end)
            return;
        temp = arr[start];
        arr[start] = arr[end];
        arr[end] = temp;
        reverseArray(arr, start+1, end-1);
    }

    static void printArray(int arr[], int size) {
        for (int i=0; i < size; i++)
            System.out.print(arr[i] + " ");
        System.out.println();
    }

    public static void main (String[] args) {
        int arr[] = {1, 2, 3, 4, 5, 6};
        printArray(arr, 6);
        reverseArray(arr, 0, 5);
        System.out.println("Reversed array is ");
        printArray(arr, 6);
    }
}

Here's how it works:

1. The reverseArray method takes an array and two indices (start and end) as input. The start index is initially 0 (the first element) and the end index is the last element of the array.

2. If start is greater than or equal to end, it means we've traversed half of the array and swapped all the necessary elements, so we return from the method.

3. If start is less than end, we swap the elements at these indices.

4. We then call reverseArray again, but this time with start+1 and end-1. This means we're moving towards the middle of the array from both ends.

5. This process continues until start is no longer less than end, at which point all elements have been swapped and the array is reversed.

6. The printArray method is used to print the array before and after reversing.