/** Circulary linked list with nodes of type Node storing strings. */
public class CircleList {
  protected Node cursor;	// the current cursor 
  protected int size;	        // the number of nodes in the list
  /** Constructor that creates and empty list */
  public CircleList() { cursor = null; size = 0; }
  /** Returns the current size */
  public int size() { return size; }
  /** Returns the cursor */
  public Node getCursor() { return cursor; }
  /** Moves the cursor forward */
  public void advance() { cursor = cursor.getNext(); }
  /** Adds a node after the cursor  */
  public void add(Node newNode) {
    if (cursor == null) {    // list is empty
      newNode.setNext(newNode);
      cursor = newNode;
    }
    else {
      newNode.setNext(cursor.getNext());
      cursor.setNext(newNode);
    }
    size++;
  }
  /** Removes the node after the cursor */
  public Node remove() {
    Node oldNode = cursor.getNext();	// the node being removed
    if (oldNode == cursor) 
      cursor = null; // list is becoming empty
    else {
      cursor.setNext(oldNode.getNext());	// link out the old node 
      oldNode.setNext(null); 
    }
    size--;
    return oldNode;
  }
  /** Returns a string representation of the list, starting from the cursor */
  public String toString() {
    if (cursor == null) return "[]";
    String s = "[..." + cursor.getElement();
    Node oldCursor = cursor;
    for (advance(); oldCursor != cursor; advance()) 
      s += ", " + cursor.getElement();
    return s + "...]";
  }
}