Map keySet() Method in Java with Examples

This method is used to return a Set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa.

Example:

[1, 2]

Syntax of Method

Set keySet()

Parameters: This method has no argument.

Returns: This method returns a set containing keys of the specified map.

Example for Map keySet()

Below is the code to show implementation of hashCode():

Output:

{1=One, 3=Three, 5=Five, 7=Seven, 9=Nine}
[1, 3, 5, 7, 9]

Reference: Oracle Docs