HashMap Java the essence of ispolzovanija?

Read a lot of documentation read in the book , did not understand , why we need a HashMap in java ?
June 10th 19 at 15:55
1 answer
June 10th 19 at 15:57
This is an implementation of dictionary key-value. Used everywhere, for example to map the name-values as hashes and caches just for storage. The most simple, storing such as value pairs servername ip_address, we always from the dictionary by name unable to obtain ip.

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