The values() method of ConcurrentHashMap class in Java is used to create a collection out of the values of the map. It basically returns a Collection view of the values in the ConcurrentHashMap.
Syntax:
ConcurrentHashMap.values()
Parameters: The method does not accept any parameters.
Return Value: The method is used to return a collection view containing all the values of the map.
Below programs are used to illustrate the working of ConcurrentHashMap.values() Method:
Program 1: Mapping String Values to Integer Keys.
// Java code to illustrate the values() method import java.util.*;import java.util.concurrent.*; public class ConcurrentHashMapDemo { public static void main(String[] args) { // Creating an empty ConcurrentHashMap ConcurrentHashMap<Integer, String> hash_map = new ConcurrentHashMap<Integer, String>(); // Mapping string values to int keys hash_map.put(10, "Geeks"); hash_map.put(15, "4"); hash_map.put(20, "Geeks"); hash_map.put(25, "Welcomes"); hash_map.put(30, "You"); // Displaying the HashMap System.out.println("Initial Mappings are: " + hash_map); // Using keySet() to get the set view of keys System.out.println("The Collection is: " + hash_map.values()); }} |
Output:
Initial Mappings are: {20=Geeks, 25=Welcomes, 10=Geeks, 30=You, 15=4}
The Collection is: [Geeks, Welcomes, Geeks, You, 4]
Program 2: Mapping Integer Values to String Keys.
// Java code to illustrate the values() method import java.util.*;import java.util.concurrent.*; public class ConcurrentHashMapDemo { public static void main(String[] args) { // Creating an empty ConcurrentHashMap ConcurrentHashMap<String, Integer> hash_map = new ConcurrentHashMap<String, Integer>(); // Mapping int values to string keys hash_map.put("Geeks", 10); hash_map.put("4", 15); hash_map.put("Geeks", 20); hash_map.put("Welcomes", 25); hash_map.put("You", 30); // Displaying the HashMap System.out.println("Initial Mappings are: " + hash_map); // Using keySet() to get the set view of keys System.out.println("The Collection is: " + hash_map.values()); }} |
Output:
Initial Mappings are: {4=15, Geeks=20, You=30, Welcomes=25}
The Collection is: [15, 20, 30, 25]
Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.
