leetcode-Remove Duplicates from Sorted List

problem:

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.

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 Linked List

code:

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) {
 *         val = x;
 *         next = null;
 *     }
 * }
 */
public class Solution {
    public ListNode deleteDuplicates(ListNode head) {
        if(head==null){
            return null;
        }
        ListNode node=head;
        while(node.next!=null){
            if(node.val==node.next.val){
                node.next=node.next.next;
            }else{
                node=node.next;
            }
        }
        return head;
    }
}