简单高性能计数器

        //计数器
        HashMap count = new HashMap();
        for (HouseTemp htemp : hdata) {
            String currkey = htemp.getTaizhang();
            if (count.containsKey(currkey)) {
                int oldValue = count.get(currkey);
                count.put(currkey, oldValue + 1);
            } else {
                count.put(currkey, 1);
            }
        }    

　　直接遍历集合 可直接根据自定义key自动获取该key的重复值。