jfreechart安装程序和使用说明

				/* ===========================================================
				 * JFreeChart : a free chart library for the Java(tm) platform
				 * ===========================================================
				 *
				 * (C) Copyright 2000-2004, by Object Refinery Limited and Contributors.
				 *
				 * Project Info:  http://www.jfree.org/jfreechart/index.html
				 *
				 * This library is free software; you can redistribute it and/or modify it under the terms
				 * of the GNU Lesser General Public License as published by the Free Software Foundation;
				 * either version 2.1 of the License, or (at your option) any later version.
				 *
				 * This library 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 Lesser General Public License for more details.
				 *
				 * You should have received a copy of the GNU Lesser General Public License along with this
				 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
				 * Boston, MA 02111-1307, USA.
				 *
				 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
				 * in the United States and other countries.]
				 *
				 * ---------------------
				 * EntityCollection.java
				 * ---------------------
				 * (C) Copyright 2002-2004, by Object Refinery Limited.
				 *
				 * Original Author:  David Gilbert (for Object Refinery Limited);
				 * Contributor(s):   -;
				 *
				 * $Id: EntityCollection.java,v 1.1 2004/08/31 14:32:37 mungady Exp $
				 *
				 * Changes
				 * -------
				 * 23-May-2002 : Version 1 (DG);
				 * 25-Jun-2002 : Removed unnecessary import (DG);
				 * 26-Jun-2002 : Added iterator() method (DG);
				 * 03-Oct-2002 : Fixed errors reported by Checkstyle (DG);
				 * 30-Jan-2004 : Added a method to add a collection of entities.
				 *
				 */
				
				package org.jfree.chart.entity;
				
				import java.util.Collection;
				import java.util.Iterator;
				
				/**
				 * Defines the methods that a collection of entities is required to implement.
				 */
				public interface EntityCollection {
				
				    /**
				     * Clears all entities.
				     */
				    public void clear();
				
				    /**
				     * Adds an entity to the collection.
				     *
				     * @param entity  the entity.
				     */
				    public void addEntity(ChartEntity entity);
				
				    /**
				     * Adds the entities from another collection to this collection.
				     * 
				     * @param collection  the other collection.
				     */
				    public void addEntities(EntityCollection collection);
				    
				    /**
				     * Returns an entity whose area contains the specified point.
				     *
				     * @param x  the x coordinate.
				     * @param y  the y coordinate.
				     *
				     * @return The entity.
				     */
				    public ChartEntity getEntity(double x, double y);
				
				    /**
				     * Returns the entities in an unmodifiable collection.
				     * 
				     * @return The entities.
				     */
				    public Collection getEntities();
				    
				    /**
				     * Returns an iterator for the entities in the collection.
				     *
				     * @return An iterator.
				     */
				    public Iterator iterator();
				
				}