Question

The method add(int, Object) in the type ArrayList is not applicable for the

String sql = "select * from haoyou where userId="+userId;
conn = DBConn.getConn();
try
{
st = conn.createStatement();
rs = st.executeQuery(sql);
while(rs.next())
{
int haoyouId=rs.getInt("haoyouId");
haoyouIdList.add(haoyouId);
}
}
其中haoyouIdList.add(haoyouId); add出错!
求大神指导

Answer 1

你这exception的信息都没有打全，把haoyouId
换成Integer试试

追问

还是不行

追答

你的haoyouIdList是怎么定义的？List list = new ArrayList();还是直接List list = new ArrayList()；