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java solution

class Solution {public ListNode mergeTwoLists(ListNode list1, ListNode list2) {ListNode dummy = new ListNode(0);ListNode current = dummy;while(list1 != null && list2 != null) {if(list1.val <= list2.val) {current.next = list1;list1 = list1.next;} else {current.next = list2;list2 = list2.next;}current = current.next;}if(list1 != null) {current.next = list1;} else if(list2 != null) {current.next = list2;}return dummy.next;   }
}