What is the closest to ConcurrentHashMap and NavigableMap in Java?

[Jacek Furmankiewicz]

On Thursday, 14 November 2013 at 21:36:46 UTC, ilya-stromberg 
wrote:
> On Thursday, 14 November 2013 at 21:31:52 UTC, Jacek 
> Furmankiewicz wrote:
> How often do you change the data? Probably, you should use 
> `immutable` variables.

Customer specific. It may change once a year. It may change 
multiple times per second for a while, then nothing again for 
weeks.

Others may do mass loads of business rules, hence do mass changes 
every few hours.

Next to impossible to predict.