What is the closest to ConcurrentHashMap and NavigableMap in Java?

[ilya-stromberg]

On Thursday, 14 November 2013 at 17:36:09 UTC, Jacek 
Furmankiewicz wrote:
> In our Java code, we make heavy use of ConcurrentHashMap for 
> in-memory caches:

Try to look dcollections:
http://www.dsource.org/projects/dcollections

Also, Vibe.d has own hashmap:
https://github.com/rejectedsoftware/vibe.d/blob/master/source/vibe/utils/hashmap.d