Question

for(int i=0;i<videos.length();i++){                     
    HashMap<String, String> map = new HashMap<String, String>();    
    JSONObject e = videos.getJSONObject(i);

    map.put("id",  String.valueOf(i));
    map.put("title",  e.getString("title"));
    map.put("description",  e.getString("description"));
    mylist.add(map);
}       

Hi, I am trying to sort the code above alphabetically. I know tree maps, are supposed to be used for this sorta thing, but it would be a bigger hassle to to do that. I am having errors arranging the hash map, and have looked at numerous examples.

Answer 1

It is not a big hassle to use a TreeMap.

    for(int i=0;i<videos.length();i++){                     
        Map<String, String> map = new TreeMap<String, String>();    
        JSONObject e = videos.getJSONObject(i);

        map.put("id",  String.valueOf(i));
        map.put("title",  e.getString("title"));
        map.put("description",  e.getString("description"));
        mylist.add(map);
    }

Even if that’s a lot of hassle (e.g. if you made the mistake of declaring mylist to be a List<HashMap>), you’ve got little choice. A HashMap is inherently unsorted / unordered and you can’t change that fact. If you could use a LinkedHashMap instead, you could add the entries in alphabetical order, but if you can change the map type you may as well use a TreeMap.