In Java, get() method of LinkedHashMap 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.
--> java.util Package --> LinkedHashMap Class --> get() Method
Syntax:
Linked_Hash_Map.get(Object key_element)
Parameter: One parameter key_element of object type and refers to the key whose associated value is supposed to be fetched.
Return Type: Value associated with the key_element in the parameter.
Example 1: Mapping String Values to Integer Keys.
// Java Program to illustrate get() method // of LinkedHashMap // Mapping String Values to Integer Keys // Importing required classes import java.util.*;
// Main class public class GFG {
// Main driver method
public static void main(String[] args)
{
// Creating an empty HashMap
LinkedHashMap<Integer, String> li_hash_map
= new LinkedHashMap<Integer, String>();
// Mapping string values to int keys
// using put() method
li_hash_map.put( 10 , "Geeks" );
li_hash_map.put( 15 , "4" );
li_hash_map.put( 20 , "Geeks" );
li_hash_map.put( 25 , "Welcomes" );
li_hash_map.put( 30 , "You" );
// Printing all elements of LinkedHashMap
System.out.println( "Initial Mappings are: "
+ li_hash_map);
// Getting the value of 25
System.out.println( "The Value is: "
+ li_hash_map.get( 25 ));
// Getting the value of 10
System.out.println( "The Value is: "
+ li_hash_map.get( 10 ));
}
} |
Initial Mappings are: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You} The Value is: Welcomes The Value is: Geeks
Example 2: Mapping Integer Values to String Keys
// Java Program to Illustrate get() method // Mapping Integer Values to String Keys // Importing required classes import java.util.*;
// Main class public class Linked_Hash_Map_Demo {
// Main driver method
public static void main(String[] args)
{
// Creating an empty LinkedHashMap
LinkedHashMap<String, Integer> li_hash_map
= new LinkedHashMap<String, Integer>();
// Mapping int values to string keys
// using put() method
li_hash_map.put( "Geeks" , 10 );
li_hash_map.put( "4" , 15 );
li_hash_map.put( "Geeks" , 20 );
li_hash_map.put( "Welcomes" , 25 );
li_hash_map.put( "You" , 30 );
// Printing all elements of LinkedHashMap
System.out.println( "Initial Mappings are: "
+ li_hash_map);
// Getting the value of "Geeks"
System.out.println( "The Value is: "
+ li_hash_map.get( "Geeks" ));
// Getting the value of "You"
System.out.println( "The Value is: "
+ li_hash_map.get( "You" ));
}
} |
Initial Mappings are: {Geeks=20, 4=15, Welcomes=25, You=30} 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.