// File: Tape.object_representation
// Time-stamp: "2005-12-27 21:22:02 calvanese"
// Scopo: Tape: representation of the objects of the class

class Node {
  String name;
  int    length;
  Node   next;
}


public class Tape {

  // representation of the objects
  private int  residualCapacity;   // space left on time in minutes
  private int  numberOfPrograms;   // how many programs are stored on the tape
  private Node programListing;     // reference to linked list of nodes

  // public methods
  ...

}