JSP中用List list = new ArrayList();报错, List cannot be resolved to a type，arraylistresolved

JSP中用List list = new ArrayList();报错, List cannot be resolved to a type，arraylistresolved

List<类型> list = null; // 在页面题头先把这个包java.util.List;和java.util.ArrayList;导进来。

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8" import="java.io.*,java.util.List,java.util.ArrayList"%>

list = (List<类型>)session.getAttribute(“LIST”);//从session中出key为”LIST” 的Value
if(null == list){
list = new Arryalist<类型>();
list.add(你要加入的类型的对象);
session.setAttriber(“LIST”,list);//添加到session中
}