// Represents a list of integers.
public class LinkedIntList {
   private ListNode front;
   
   // post: Constructs an empty list
   public LinkedIntList() {
      front = null;
   }
   
   // post: Prints the list contents in one line, separated by spaces
   public void printList() {
      ListNode current = front;
      while (current != null) {
         System.out.print(current.data + " ");
         current = current.next;
      }
      System.out.println();
   }
   
   // post: Adds the given value to the end of this list
   public void add(int value) {
      if (front == null) {
         // special case to deal with the empty list
         front = new ListNode(value);
      } else {
         // add at the end of any other length list
         ListNode current = front;
         while (current.next != null) {
            current = current.next;
         }
         current.next = new ListNode(value);
      }
   }
   
   
   
}