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:
// 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 )); } } |
Initial Mappings are: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4} The Value is: Welcomes The Value is: Geeks
Program 2:
// 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" )); } } |
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.
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