package cn.edu.nju.software.sd.cll; /**  * ConsoleAppender, implements appender  * something like the realization of the observer in the observer pattern  * @author SuSE  *  */ public class ConsoleAppender implements Appender {     private Layout layout;          /**     * construct of ConsoleAppender.     * @param layout     */	public ConsoleAppender(Layout layout) {	   	    this.layout=layout;	}       /**    * the real function to deal with the 'update' in the observer pattern.    * @param message    * @param logger    */	public void doLog(String message,Logger logger){		System.out.println(layout.format(message,logger));	}        public void setLayout(Layout layout)  {                    this.layout=layout;        } /** * realize of the method in the interface 'Appender'  */     public void update(Logger logger,String message) {         doLog(message,logger);    }}