javalinkedhashmap

Getting last key from a LinkedHashMap

I have LinkedHashMap returning from DB. From this map I need to get the last key. If I get all keys using keySet method it returns Set of keys but Set does not guarantee the order. I need to take exactly last key from the LinkedHashMap returned from DB. How can I do that ?

Below is the code how I get data from database.

LinkedHashMap<String,String> map = someDao.getMap(String input);

From this map I need to take last key.

Solution

  • keySet() being executed on LinkedHashMap returns LinkedHashSet that is indeed Set but "remembers" the order of elements.

    You can get the last element as following: 

    Map<TheType> map = .....
.................
TheType theLastKey = new ArrayList<>(map.keySet()).get(map.size() - 1)