Question

java lambda 循环怎么获取下标

Answer 1

java::
try {
            List<DataDictDO> list = dataDictDao.getAllList("dataDictMapper.getDataDictInfo", null);
            DataDictDO bean;
            String itemName;
            String colName;
            DATA_DICT_MAP.clear();
            for (int i = 0; i < list.size(); i++) {
                bean = list.get(i);
                itemName = bean.getItemName();
                colName = bean.getColName();
                Map<String, String> beanMap;
                String itemNameColName = (itemName + "-" + colName);
                if (DATA_DICT_MAP.containsKey(itemNameColName)) {
                    beanMap = DATA_DICT_MAP.get(itemNameColName);
                } else {
                    beanMap = new HashMap<String, String>();
                }
                beanMap.put(bean.getItemVal(), bean.getItemDesc());
                DATA_DICT_MAP.put(itemNameColName, beanMap);
            }
        } catch (Exception e) {
            LOG.error("加载数据字典缓存失败！！！", e);
        }

lambda

DATA_DICT_MAP = list.stream().collect(Collectors.groupingBy(
        it -> it.getItemName() + "-" + it.getColName(),
        Collectors.toMap(DataDictDO::getItemVal, DataDictDO::getItemDesc)));