Remove Duplicate Node From Sorted Linked List

 /**

 * Definition for singly-linked list.

 * public class ListNode {

 *     int val;

 *     ListNode next;

 *     ListNode() {}

 *     ListNode(int val) { this.val = val; }

 *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }

 * }

 */

class Solution {

    public ListNode deleteDuplicates(ListNode head) {

        if(head == null){

            return head;

        }

        ListNode newHead = head;

        while(newHead.next != null){

            if(newHead.val == newHead.next.val){

                newHead.next = newHead.next.next;

            }

            else {

                newHead = newHead.next;

            }

        }return head;

       

    }

}

Note: Isme ham head.next isliye kar rhe hai kyo ki ham head != null ka wait nhi kar sakte

kyu ki null me kabhi data hota hi nhi hai aur na hi null ke bad koi next hota hai.