加入switch为什么会不能编译成功

<%

   int flag = (int)request.getAttribute("flag");

FoodDaolmpl foodDaolmpl = new FoodDaolmpl();

switch(flag){

    case 0:

    List<Map<String, Object>> db =foodDaolmpl.getAllFood();

    break;

}

if (!db.isEmpty()) {%>

<%for (Map<String, Object> map : db) {%>

<tr>

<td>

 <%=map.get("id")%>

</td>

<td>

 <%= map.get("foodName")%>

</td>

<td>

 <%=map.get("taste")%>

</td>

<td>

 <img src="<%= map.get("foodImage")%>">

</td>

<td>

 <%=map.get("price")%>

</td>

<td>

 <%=map.get("description")%>

</td>

</tr>

<%}%>

<%}%>