/**
 * Tokens for a simple lexical analyzer.  Do not use this class
 * directly; it is intended only as a superclass for individual
 * token types.
 *
 * Every Token class should include a static build(String) method
 * which clients should call *instead of* new.  This design allows
 * token implementations to create only one object for many
 * equivalent tokens when necessary.
 *
 * @author Samuel A. Rebelsky
 * @version 1.0 of February 2001
 */
public abstract class Token {
} // class Token