/** Interface specifying methods for a general collection.
*/
public interface Database {

   /** The default initialize size of a database. */
   int STARTSIZE = 10;

   /** Find out how many things are in the database.
       @return the number
   */
   int size();

   /** Display the items in the database on the screen.
   */
   void display();

   /** Find a particular item in the database.
       @param o the object to search for
       @return the object if found, null otherwise
   */
   Object find(Object o);

   /** Add an item to the database, if there is room.
       @param o the object to add
       @return true if added, false otherwise
   */
   boolean add(Object o);
}