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import java.util.Timer;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.http.HttpServlet;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
 * @date 2010-1-14
 * @author wangpeng
 * ¹¦ÄÜ£º¼àÌýÆ÷£¬ÓÃÀ´ÊµÏÖ¼ÆÊ±Æ÷
 */
public class ContextListener extends HttpServlet implements
  ServletContextListener {
 /**
  *
  */
 private static final long serialVersionUID = 1L;
 private static final Log log = LogFactory.getLog(NewsTimerTask.class);
 
 public ContextListener() {
 }
 private Timer timer = null;
 public void contextInitialized(ServletContextEvent event) {
  timer = new Timer(true);
  log.info("¶¨Ê±Æ÷ÒÑÆô¶¯");
  timer.schedule(new NewsTimerTask(event.getServletContext()),
    TIME_NEWS_DELAY, TIME_NEWS_PERIOD);
  log.info("ÒѾ­Ìí¼ÓÈÎÎñµ÷¶È±í");
 }
 public void contextDestroyed(ServletContextEvent event) {
  timer.cancel(); //¶¨Ê±Æ÷µÄÏú»Ù
  log.info("¶¨Ê±Æ÷Ïú»Ù");
 }
}
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NewsTimerTask¼Ì³ÐTimerTask
TimerTaskÊÇ ÓÉ Timer °²ÅÅΪһ´ÎÖ´Ðлò


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package com.yz.mystack;
public class Stack {
Object[] datas;
Integer n=0;
Integer N=1;
public Stack(){
datas=new Object[N];
}

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