JStock是一个免费股市软件

				/*
				 * Observer.java
				 *
				 * Created on April 28, 2007, 1:25 AM
				 *
				 * This program is free software; you can redistribute it and/or modify
				 * it under the terms of the GNU General Public License as published by
				 * the Free Software Foundation; either version 2 of the License, or (at
				 * your option) any later version.
				 *
				 * This program is distributed in the hope that it will be useful, but
				 * WITHOUT ANY WARRANTY; without even the implied warranty of
				 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
				 * General Public License for more details.
				 *
				 * You should have received a copy of the GNU General Public License
				 * along with this program; if not, write to the Free Software
				 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
				 *
				 * Copyright (C) 2007 Cheok YanCheng 
				 */
				
				package org.yccheok.jstock.engine;
				
				/**
				 *
				 * @author yccheok
				 */
				public interface Observer {
				    public void update(S subject, A arg);
				    
				}