LeetCode-83 Remove Duplicates from Sorted List Solution (with Java)

 1 /**
 2  * Created by sheepcore on 2019-05-08
 3  * Definition for singly-linked list.
 4  * public class ListNode {
 5  *     int val;
 6  *     ListNode next;
 7  *     ListNode(int x) { val = x; }
 8  * }
 9  */
10 class Solution {
11     public ListNode deleteDuplicates(ListNode head) {
12          if(head == null)
13             return head;
14         else{
15             ListNode pre = head, cur = head.next;
16             while (cur != null){
17                 if(cur.val == pre.val){
18                     pre.next = cur.next;
19                     cur = cur.next;
20                 } else{
21                     pre = cur;
22                     cur = cur.next;
23                 }
24             }
25         }
26         return head;
27         
28     }
29 }