从 Static Hash Map 清除密钥的实用程序

Question

I have a Servlet based Web App which has a Helper class containing a static HashMap. Data is loaded into the HashMap from DB once on Servlet init. I need to create a utility to clear specific keys from the HashMap and reload those specific keys from the DB. What is the best way to implement a Utility to do this?

Answer 1

If you can use something other than HashMap you could look into Google guava library has a built in support for this( https://github.com/google/guava/wiki/CachesExplained ). Hope that helps