// Shaun Conlon
// This class represents a linked list of integers.

public class IntList {

  private IntNode head;
  private IntNode tail;

  public IntList(IntNode start) {
    head = tail = start;
  }

  public void setHead(IntNode head) {
    this.head = head;
  }
 
  public IntNode getHead() {
    return head;
  }

  public void setTail(IntNode tail) {
    this.tail = tail;
  }

  public IntNode getTail() {
    return tail;
  }
  
  // adds a node to the tail of the list
  public void add(IntNode next) {
    tail.setNext(next);
    setTail(next);
  }

  // iterator class for an IntList
  public IntListIterator implements Iterator {
    
    private IntNode current;    

    public IntListIterator(IntList l) {
      current = l.getHead();
    }

    public boolean hasNext() {
      return (current != null);
    }

    public Object next() {
      Integer i = new Integer(current.getData());
      current = current.getNext();
      return i;
    }

  }

  // returns an Iterator for this list
  public Iterator iterator() {
    return new IntListIterator(this);
  }

}