jsp数据库开发完全手册

package com.bwm.login; import java.util.Vector; import java.util.HashMap; import java.util.HashSet; import java.util.Hashtable; import java.util.Calendar; import java.util.WeakHashMap; public class user { Vector temp=new Vector(); temp.equals(); temp.indexOf(); //HashMap ha=new HashMap(); HashSet ha=new HashSet(); Calendar ca=new Calendar(); WeakHashMap we=new WeakHashMap(); public String username; }