Quickest implementation of Java Map for a small number of entries

Question

What is the quickest implementation of java.util.Map for a very small number of entries (under 15 elements or so)? Both thread-safe and non-thread-safe.

Answer 1

I'd say HashMaps.

HashMap map = new HashMap ();

will give you a very simple map with a key type of String and Value type of Object.

Edit: This is a non-thread safe version.

You can check out ConcurrentHashMaps for a thread-safe map.