java.lang.ClassCastException:info.ShopBeanatjava.util.TreeMap.compare(UnknownSource)atjava.utresponse.setContentType("text/html;setchar:UTF-8");PrintWriterout=response.getWriter();HttpSessionsession=request.getSession();Setset=newTreeS

Question

java.lang.ClassCastException:info.ShopBean at java.util.TreeMap.compare(Unknown Source) at java.ut
response.setContentType("text/html;setchar:UTF-8");
PrintWriter out = response.getWriter();
HttpSession session = request.getSession();
Set set = new TreeSet();
for(int i=0;i

Answer 1

都说了是java.lang.ClassCastException类转换异常