// This class contains the example from lecture.
// Drag the "dummy" variable out to view p and q.

public class ListTest {
   public static void main(String[] args) {
      // This node is just so we get a nice view in
      // the debugger of p and q
      ListNode dummy = new ListNode();
      ListNode p = new ListNode(1, new ListNode(2));
      ListNode q = new ListNode(3, new ListNode(4));
      
      // code we wrote to change before to after
      p.next.next = q;
      q = q.next;
      p.next.next.next = null;
   }
}