Java Map Example. It returns the Set of the keys fetched from the map. Once stored in a Map you can later look up the value using just the key.
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This interface takes the place of the Dictionary class which was a totally abstract class rather than an interface. The Map interface maps unique keys to values. The main characteristic of a SortedMap is that it orders the keys by their natural ordering or by a specified comparator.
A map of error codes and their descriptions.
A map of zip codes and cities. Therefore it behaves a bit different from the rest of the. The set contains objects of type MapEntry. When you use a map operation a new stream is returned consisting of the resultant elements after applying the given function to the elements of source stream.
