// Source code example for "A Practical Introduction
// to Data Structures and Algorithm Analysis"
// by Clifford A. Shaffer, Prentice Hall, 1998.
// Copyright 1998 by Clifford A. Shaffer

// Elem interface.  This is just an Object with
// support for a key field.
interface Elem {             // Interface for generic element type
  public abstract int key(); // Key used for search and ordering
} // interface Elem