Map (Java Platform SE 7 ) - Oracle
https://docs.oracle.com/javase/7/docs/api/java/util/Map.html
An object that maps keys to values. A map cannot contain duplicate keys; each key can map to at most one value. This interface takes the place of the Dictionary class, which was a totally abstract class rather than an interface.. The Map interface provides three collection views, which allow a map's contents to be viewed as a set of keys, collection of values, or set of key-value mappings.
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