Java Map按Key值进行排序

public class MapSortDemo {

    public static void main(String[] args) {

        Map<String, String> map = new TreeMap<String, String>();

        map.put("KFC", "kfc");
        map.put("WNBA", "wnba");
        map.put("NBA", "nba");
        map.put("CBA", "cba");

        Map<String, String> resultMap = sortMapByKey(map);    //按Key进行排序
//        Map<String, String> resultMap = sortMapByValue(map); //按Value进行排序

        for (Map.Entry<String, String> entry : resultMap.entrySet()) {
            System.out.println(entry.getKey() + " " + entry.getValue());
        }
    }
   
    /**
     * 使用 Map按value进行排序
     * @param map
     * @return
     */
    public static Map<String, String> sortMapByValue(Map<String, String> oriMap) {
        if (oriMap == null || oriMap.isEmpty()) {
            return null;
        }
        Map<String, String> sortedMap = new LinkedHashMap<String, String>();
        List<Map.Entry<String, String>> entryList = new ArrayList<Map.Entry<String, String>>(
                oriMap.entrySet());
        Collections.sort(entryList, new MapValueComparator());

        Iterator<Map.Entry<String, String>> iter = entryList.iterator();
        Map.Entry<String, String> tmpEntry = null;
        while (iter.hasNext()) {
            tmpEntry = iter.next();
            sortedMap.put(tmpEntry.getKey(), tmpEntry.getValue());
        }
        return sortedMap;
    }
}



class MapValueComparator implements Comparator<Map.Entry<String, String>> {

    @Override
    public int compare(Entry<String, String> me1, Entry<String, String> me2) {

        return me1.getValue().compareTo(me2.getValue());
    }
}