LeetCode OJ 83. Remove Duplicates from Sorted List

Given a sorted linked list, delete all duplicates such that each element appear only once.

For example,
Given 1->1->2, return 1->2.
Given 1->1->2->3->3, return 1->2->3.

public class Solution {
    public ListNode deleteDuplicates(ListNode head) {
        if(head==null || head.next==null) return head;
        ListNode temp = head;
        
        while(temp.next!=null){
            if(temp.val == temp.next.val){
                temp.next = temp.next.next;
            }
            else{
                temp = temp.next;
            }
        }
        return head;
    }
}