Remove Nth Node from End of List

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) {
 *         val = x;
 *         next = null;
 *     }
 * }
 */
public class Solution {
    public ListNode removeNthFromEnd(ListNode head, int n) {
		// Start typing your Java solution below
		// DO NOT write main() function
		if(head == null)
			return null;
		int i = 0;
		ListNode tail = head;
		ListNode node = head;
		while(i++ < n){
			tail = tail.next;
		}
		if(tail == null)
			return head.next;
		while(tail.next != null){
			tail = tail.next;
			node = node.next;
		}
		node.next = node.next.next;
		return head;
	}
}