Open In App
Related Articles

HashMap get() Method in Java

Improve
Improve
Improve
Like Article
Like
Save Article
Save
Report issue
Report
The java.util.HashMap.get() method of HashMap 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:
Hash_Map.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.HashMap.get() method: Program 1: Mapping String Values to Integer Keys.
// Java code to illustrate the get() method
import java.util.*;
  
public class Hash_Map_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty HashMap
        HashMap<Integer, String> hash_map = new HashMap<Integer, String>();
  
        // Mapping string values to int keys
        hash_map.put(10, "Geeks");
        hash_map.put(15, "4");
        hash_map.put(20, "Geeks");
        hash_map.put(25, "Welcomes");
        hash_map.put(30, "You");
  
        // Displaying the HashMap
        System.out.println("Initial Mappings are: " + hash_map);
  
        // Getting the value of 25
        System.out.println("The Value is: " + hash_map.get(25));
  
        // Getting the value of 10
        System.out.println("The Value is: " + hash_map.get(10));
    }
}

                    
Output:
Initial Mappings are: {20=Geeks, 25=Welcomes, 10=Geeks, 30=You, 15=4}
The Value is: Welcomes
The Value is: Geeks
Program 2: Mapping Integer Values to String Keys.
// Java code to illustrate the get() method
import java.util.*;
  
public class Hash_Map_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty HashMap
        HashMap<String, Integer> hash_map = new HashMap<String, Integer>();
  
        // Mapping int values to string keys
        hash_map.put("Geeks", 10);
        hash_map.put("4", 15);
        hash_map.put("Geeks", 20);
        hash_map.put("Welcomes", 25);
        hash_map.put("You", 30);
  
        // Displaying the HashMap
        System.out.println("Initial Mappings are: " + hash_map);
  
        // Getting the value of "Geeks"
        System.out.println("The Value is: " + hash_map.get("Geeks"));
  
        // Getting the value of "You"
        System.out.println("The Value is: " + hash_map.get("You"));
    }
}

                    
Output:
Initial Mappings are: {4=15, Geeks=20, You=30, Welcomes=25}
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.

Last Updated : 11 Jan, 2023
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads