LinkedHashMap get() Method in Java with Examples (original) (raw)

Last Updated : 17 Nov, 2021

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 keyelement)

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 `

// 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));
}

}

`

Output:

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 `

// 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"));
}

}

`

Output:

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.