关于+=的问题字符串拼接的时候前面有个null

Question

        private String ido;
        String hql="from TFxShop where 1=1 ";
        Map<String, Object> params = new HashMap<String, Object>();
        shoppage = shopService.getInfoForPage(shoppage, hql, params);
        List<TFxShop> ls= shoppage.getResult();
        if(ls != null && ls.size() > 0){
            for(int i = 0; i < ls.size(); i++){
                ido += ls.get(i).getId()+",";

            }
        }

Answer 1

private String ido = "";

第一句换成这个就OK了。

如果有帮助，希望结帖