IdentityHashMap get() Method in Java

The java.util.IdentityHashMap.get() method of IdentityHashMap class is used to retrieve or fetch the value mapped by a particular key mentioned in the parameter. It returns NULL when the map contains no such mapping for the key.

Syntax:

IdentityHashMap.get(Object key_element)

Parameter: The method takes one parameter key_element of object type and refers to the key whose associated value is supposed to be fetched.

Return Value: The method returns the value associated with the key_element in the parameter.

Below programs illustrates the working of java.util.IdentityHashMap.get() method:



Program 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java code to illustrate the get() method
import java.util.*;
  
public class Identity_Hash_Map_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty IdentityHashMap
        Map<Integer, String> identity_hash = 
              new IdentityHashMap<Integer, String>();
  
        // Mapping string values to int keys
        identity_hash.put(10, "Geeks");
        identity_hash.put(15, "4");
        identity_hash.put(20, "Geeks");
        identity_hash.put(25, "Welcomes");
        identity_hash.put(30, "You");
  
        // Displaying the IdentityHashMap
        System.out.println("Initial Mappings are: "
                                       identity_hash);
  
        // Getting the value of 25
        System.out.println("The Value is: "
                                identity_hash.get(25));
  
        // Getting the value of 10
        System.out.println("The Value is: "
                                identity_hash.get(10));
    }
}

chevron_right


Output:

Initial Mappings are: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
The Value is: Welcomes
The Value is: Geeks

Program 2:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java code to illustrate the get() method
import java.util.*;
  
public class Identity_Hash_Map_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty IdentityHashMap
        Map<String, Integer> identity_hash = 
               new IdentityHashMap<String, Integer>();
  
        // Mapping int values to string keys
        identity_hash.put("Geeks", 10);
        identity_hash.put("4", 15);
        identity_hash.put("Geeks", 20);
        identity_hash.put("Welcomes", 25);
        identity_hash.put("You", 30);
  
        // Displaying the IdentityHashMap
        System.out.println("Initial Mappings are: "
                                       identity_hash);
  
        // Getting the value of "Geeks"
        System.out.println("The Value is: "
                          identity_hash.get("Geeks"));
  
        // Getting the value of "You"
        System.out.println("The Value is: "
                            identity_hash.get("You"));
    }
}

chevron_right


Output:

Initial Mappings are: {Geeks=20, Welcomes=25, You=30, 4=15}
The Value is: 20
The Value is: 30

Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.

Attention reader! Don’t stop learning now. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready.




My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.