The
keySet() method of
ConcurentHashMap class in Java is used to create a set out of the key elements contained in the hash map. It basically returns a set view of the keys or we can create a new set and store the key elements in them.
Syntax:
ConcurrentHashMap.keySet()
Parameters: The method does not take any parameter.
Return Value: The method returns a set having the keys of the hash map.
Below programs are used to illustrate the working of keySet() Method:
Program 1: Mapping String Values to Integer Keys.
Output:
Initial Mappings are: {20=Geeks, 25=Welcomes, 10=Geeks, 30=You, 15=4}
The set is: [20, 25, 10, 30, 15]
Program 2: Mapping Integer Values to String Keys.
Output:
Initial Mappings are: {4=15, Geeks=20, You=30, Welcomes=25}
The set is: [4, Geeks, You, Welcomes]
Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.
