beginnersbook.com

  • Home
  • All Tutorials
    • Learn Servlet
    • Learn JSP
    • Learn JSTL
    • Learn C
    • Learn C++
    • Learn MongoDB
    • Learn XML
    • Learn Python
    • Learn Perl
    • Learn Kotlin
    • Learn jQuery
  • Core Java
  • OOPs
  • Collections
  • Java I/O
  • JSON
  • DBMS

Java – Check if a particular value exists in HashMap example

By Chaitanya Singh | Filed Under: Java Collections

In this example we are checking whether a particular value exists in HashMap or not. We will be using containsValue() method of HashMap class to perform this check:

public boolean containsValue(Object value): Returns true if this map maps one or more keys to the specified value.

Complete Code:

Here we have a HashMap of integer keys and String values, we are checking whether a particular String is mapped to any of the key of HashMap.

import java.util.HashMap;

public class CheckValueExample {
 
 public static void main(String[] args) {
 
    // Creating a HashMap of int keys and String values
    HashMap<Integer, String> hashmap = new HashMap<Integer, String>();
 
    // Adding Key and Value pairs to HashMap
    hashmap.put(11,"Chaitanya");
    hashmap.put(22,"Pratap");
    hashmap.put(33,"Singh");
    hashmap.put(44,"Rajesh");
    hashmap.put(55,"Kate");
 
    // Checking Value Existence
    boolean flag = hashmap.containsValue("Singh");
    System.out.println("String Singh exists in HashMap? : " + flag);
 }
}

Output:

String Singh exists in HashMap? : true

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Java Tutorial

  • Java Tutorial
  • OOPs Concepts

Java Collections

  • ArrayList
  • LinkedList
  • ArrayList vs LinkedList
  • Vector
  • ArrayList vs Vector
  • HashMap
  • TreeMap
  • LinkedHashMap
  • HashSet
  • TreeSet
  • LinkedHashSet
  • Hashtable
  • HashMap vs Hashtable
  • Queue
  • PriorityQueue
  • Deque & ArrayDeque
  • Iterator
  • ListIterator
  • Comparable Interface
  • Comparator Interface
  • Java Collections Interview Q

MORE ...

  • Java String
  • Exception handling
  • Java Multithreading
  • Java I/O
  • Java Serialization
  • Java Regex
  • Java AWT
  • Java Swing
  • Java Enum
  • Java Annotations

Copyright © 2012 – 2022 BeginnersBook . Privacy Policy . Sitemap