Java游戏高级编程！！很不错的！！！Java游戏高级编程！！很不错的

				     package com.croftsoft.core.util.cache;
				
				     import java.io.*;
				
				     /*********************************************************************
				     * An object capable of making content accessible via an InputStream.
				     *
				     * 
				     *
				     * For example, a ContentAccessor might retrieve content from a
				     * website via a URL, a database or file storage, a remote object
				     * such as another cache, or even dynamically generate the content
				     * upon demand.
				     *
				     * 
				     *
				     * As yet another possibility, a ContentAccessor object
				     * may potentially attempt to access the content from several
				     * different sources sequentially until it is successful.
				     *
				     * @see
				     *   URLContentAccessor
				     *
				     * @version
				     *   1999-04-24
				     * @author
				     *   David W. Croft
				     *********************************************************************/
				
				     public interface  ContentAccessor
				     //////////////////////////////////////////////////////////////////////
				     //////////////////////////////////////////////////////////////////////
				     {
				
				     public InputStream  getInputStream ( ) throws IOException;
				
				     //////////////////////////////////////////////////////////////////////
				     //////////////////////////////////////////////////////////////////////
				     }