ArrayList<String> array= new ArrayList<String>();
        String sql ="select (name,price,number)from xxx";
        try {
            System.out.print(sql);
            stat=conn.createStatement();
            rs=stat.executeQuery(sql);
            while(rs.next()){
             array.add(new Goods(rs.getString("name"),rs.getInt("number"),rs.getDouble("price")));
             }        //我用有参是这样做的，如果没有有参构造，改怎么实现