Remove Duplicates from Sorted List

Java

class Solution {
		public ListNode deleteDuplicates(ListNode head) {
				ListNode dummy = new ListNode(-1);
				dummy = head;
				while (head != null && head.next != null) {
				if (head.val == head.next.val) {
				head.next = head.next.next;
				} else {
					head = head.next;
				}
			}
			return dummy;
		}
}