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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

// 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

// 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.

ConcurrentHashMap values() method in Java with Examples

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