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:
// 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, "Beginner"); identity_hash.put(15, "4"); identity_hash.put(20, "Beginner"); 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)); } } |
Output:
Initial Mappings are: {10=Beginner, 30=You, 20=Beginner, 25=Welcomes, 15=4}
The Value is: Welcomes
The Value is: Beginner
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("Beginner", 10); identity_hash.put("4", 15); identity_hash.put("Beginner", 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 "Beginner" System.out.println("The Value is: " + identity_hash.get("Beginner")); // Getting the value of "You" System.out.println("The Value is: " + identity_hash.get("You")); } } |
Output:
Initial Mappings are: {Beginner=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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