Merge Two Sorted Lists

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