Java Map Set Value

Set < k > keyset () returns a set view of the keys contained in this map. As a result, we create a map of the key as a string and value as an integer. Using a stream of map.entry here we'll use the instances of map.entry.

This is shortest possible way so far. The 2nd map will have every key in the 1st map, but associated with it is a list of all the same elements that are in the set it maps to. Below programs show the implementation of int keyset () method.

In this tutorial, we’ll learn different ways to initialize a map with values in java.

The principal thing to notice is that streams are sequences of elements which can be easily obtained from a collection. It basically returns a set view of the map or we can create a new set and store the map elements into them. As we can see, actualvalues is a set of map.entry objects. Map.entry is a static interface that holds both the key and the value.