list 添加对象时，没有把new object写到循环体里，导致最后添加了相同的一个对象；

public List
    
      find(String goodsname) {        List
     
      list = new ArrayList
      
       () ;                PreparedStatement pstmt = null;        ResultSet rs = null;        String sql = "select * from goods where goods_name=?";        try {            int i=0;            pstmt = (PreparedStatement) c.prepareStatement(sql);            pstmt.setString(1, goodsname);            rs = (ResultSet) pstmt.executeQuery();            while (rs.next()) {                goods = new goods();                goods.setGoods_id(rs.getString(1));                goods.setGoods_name(rs.getString(2));                goods.setGoods_sum(rs.getString(3));                goods.setGoods_price(rs.getString(4));                goods.setGoods_from(rs.getString(5));                goods.setGoods_time(rs.getString(6));                            list.add(i++, goods);                                     }                                 return list;        } catch (SQLException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return null;    }
      
     
    

其中 goods = new goods();一定要放到循环体里面。