Consider the java.util.Map interface, which describes a map (a collection of key-value pairs). The Map interface abstracts what it means to be a map.

This class is a member of the Java Collections Framework. The class implements the Map interfaces including NavigableMap , SortedMap and extends the AbstractMap class. TreeMap in Java does not allow ...

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You will run into the Function interface in a variety of places, especially when you start advanced functional programming with the Java Streams API. Powerful methods such as map, reduce and flatMap ...