HashMap values() Method in Java
Last Updated :
26 Nov, 2018
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The java.util.HashMap.values() method of HashMap 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 HashMap.
Syntax:
Java
Java
Hash_Map.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 java.util.HashMap.values() Method: Program 1: Mapping String Values to Integer Keys.
// Java code to illustrate the values() method
import java.util.*;
public class Hash_Map_Demo {
public static void main(String[] args)
{
// Creating an empty HashMap
HashMap<Integer, String> hash_map = new HashMap<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 values() to get the set view of values
System.out.println("The collection is: " + hash_map.values());
}
}
Output:
Program 2: Mapping Integer Values to String Keys.
Initial Mappings are: {20=Geeks, 25=Welcomes, 10=Geeks, 30=You, 15=4}
The collection is: [Geeks, Welcomes, Geeks, You, 4]
// Java code to illustrate the values() method
import java.util.*;
public class Hash_Map_Demo {
public static void main(String[] args)
{
// Creating an empty HashMap
HashMap<String, Integer> hash_map = new HashMap<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 values() to get the set view of values
System.out.println("The collection is: " + hash_map.values());
}
}
Output:
Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.
Initial Mappings are: {4=15, Geeks=20, You=30, Welcomes=25}
The collection is: [15, 20, 30, 25]
