Util工具类 对map中含有String类型的日期key值的list进行排序

/**
 * 对含有map的list排序
 *
 * @param areaList 原始值
 * @param isDesc   TRUE：从大到小  FALSE：从小到大
 */
public static void sortListMap(List, Double>> areaList, final boolean isDesc) {
    Collections.sort(areaList, new Comparator, Double>>() {
        public int compare(Map.Entry, Double> o1,
                           Map.Entry, Double> o2) {
            int flag = 1;
            if (isDesc) {
                if (o2.getValue() - o1.getValue() < 0) {
                    flag = -1;
                }
            } else {
                if (o2.getValue() - o1.getValue() > 0) {
                    flag = -1;
                }
            }

            return flag;
        }
    });
}

/**
 * 对map中含有String类型的日期key值的list进行排序
 * 

 * 2017年9月29日 17:19:09
 * xj
 *
 * @param list   List,Object>>,String为日期
 * @param format 日期格式
 * @param isDesc TRUE：从大到小  FALSE：从小到大
 */
public static void sortListStringDateMap(List list, final String format, final boolean isDesc) {
    Collections.sort(list, new Comparator() {
        @Override
        public int compare(Object o1, Object o2) {
            Map, Object> o1Map = (Map, Object>) o1;
            Map, Object> o2Map = (Map, Object>) o2;
            String o1Key = "";
            for (String key : o1Map.keySet()) {
                o1Key = key;
            }
            String o2Key = "";
            for (String key : o2Map.keySet()) {
                o2Key = key;
            }
            Integer o1K = Integer.valueOf(Util.transformDateToString(Util.transformStringToDate(o1Key, format), "yyyyMMdd"));
            Integer o2K = Integer.valueOf(Util.transformDateToString(Util.transformStringToDate(o2Key, format), "yyyyMMdd"));
            int flag = 1;
            if (isDesc) {
                if (o2K - o1K < 0) {
                    flag = -1;
                }
            } else {
                if (o2K - o1K > 0) {
                    flag = -1;
                }
            }

            return flag;
        }
    });
}

更多工具类方法：http://blog.csdn.net/qq_34117825/article/details/78392976