set、Set cannot be resolved to a type

[NQ6058484]

<%
List listz = (List) request.getSession().getAttribute("queryCList");
List lista = (List) request.getSession().getAttribute("queryAll");
if (listz != null) {
for (int i = 0; i < listz.size(); i++) {
Indent indent = (Indent) lista.get(i);
Cart cart = (Cart) listz.get(i);
%>
<tr>
<td>
<font color="blue">订单编号：</font>
</td>
<td><%=indent.getIndentId()%></td>
</tr>
<%
Set<CartSelectpart> c = cart.getCartSelectparts();
Iterator projectlist = c.iterator();
if (projectlist != null) {

while (projectlist.hasNext()) {
CartSelectpart cs = (CartSelectpart) projectlist
.next();
%>

[龙四]

import了么

[元心]

<%@ page language="java" import="java.util.Set" pageEncoding="UTF-8"%>
要将import Set