Reverse every k nodes in linked list

ReverseKNodeLinkedList.java

package kata.linkedlist;

public class ReverseKNodeLinkedList {


    public static Node reverseKNodes(Node node, int k) {
        if (node == null || node.getNext() == null) {
            return node;
        }

        int n = 0;
        Node head_prev = node, head_next = null, curr = node, prev = null, tail = node;

        while (curr != null && n < k) {

            if (curr.getNext() == null || n == k - 1) {
                head_prev = curr;
            }

            Node next = curr.getNext();
            curr.setNext(prev);
            prev = curr;
            curr = next;
            n++;
        }

        head_next = reverseKNodes(curr, k);
        if (head_next != null) {
            tail.setNext(head_next);
        }

        return head_prev;
    }

}