LeetCode-----21. Merge Two Sorted Lists

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Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists.

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public class Solution {    public ListNode mergeTwoLists(ListNode l1, ListNode l2) {        ListNode dummy = new ListNode(0);        ListNode lastNode = dummy;                while (l1 != null && l2 != null) {            if (l1.val < l2.val) {                lastNode.next = l1;                l1 = l1.next;            } else {                lastNode.next = l2;                l2 = l2.next;            }            lastNode = lastNode.next;        }                if (l1 != null) {            lastNode.next = l1;        } else {            lastNode.next = l2;        }                return dummy.next;    }}



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