@@ -0,0 +1,124 @@
+package utility;%0Apublic class ListNode %7B%0A%09public int val;%0A%09public ListNode next;%0A%0A%09public ListNode(int x) %7B%0A%09%09val = x;%0A%09%7D%0A%7D%0A

update common ListNode class