Get values from Java Map

Question

I have this simple problem which I cannot solve.

I have this Map which stores the sessions:

Map<String, ActiveConnections>

I want to get all String values and insert them into ArrayList.

Can you tell em how I can do this?

possible duplicate of [How to convert a Map to List in Java?](http://stackoverflow.com/questions/1026723/how-to-convert-a-map-to-list-in-java) — Bishan, Nov 27 '13 at 10:46
@sᴜʀᴇsʜᴀᴛᴛᴀ Yeah. you are correct. not a **duplicate** of that one. but **possible duplicate** of that one. :) — Bishan, Nov 27 '13 at 10:51

score 5 · Answer 1 · answered Nov 27 '13 at 10:44

5

You can get all the keys using the keySet() method and create a new ArrayList with that.

List<String> list = new ArrayList<String>(map.keySet());

answered Nov 27 '13 at 10:44

Rahul

score 2 · Answer 2 · answered Nov 27 '13 at 10:44

2

Map contains a method called keySet() , Which

Returns a Set view of the keys contained in this map.

Then use that Set to build your List, by using constructor or using addAll method

keyList.addAll(set);

answered Nov 27 '13 at 10:44

Suresh Atta

2 Answers2