StringBuffer在循环中拼接字符串

        //获取之前处理人的邮件列表        List<TFlowActivity> activityList = flowInstance.getActivityList();        StringBuffer dealUserMail = new StringBuffer();        if (activityList == null)        {            dealUserMail = new StringBuffer("");        }        else        {            for (TFlowActivity flowActivity : activityList)            {                dealUserMail = dealUserMail.append(flowActivity.getAuditEmail()).append(";");            }        }        String dealUserMailList = dealUserMail.toString();

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??? 在循环中拼接字符串最好使用StringBuffer，效率比String高很多。