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About Ilias Tsagklis

Ilias Tsagklis
Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.

Check value existence in HashMap example

In this example we shall show you how to check a value existence in HashMap. To check if a value exists in a HashMap one should perform the following steps:

  • Create a new HashMap.
  • Populate the hashMap with elements, with the put(K key, V value) API method of HashMap.
  • Invoke the containsValue(Object key) API method of the HashMap with a specific value as parameter. The method will return true if the value exists in the HashMap, otherwise it will return false,

as described in the code snippet below.
 

package com.javacodegeeks.snippets.core;

import java.util.HashMap;
 
public class CheckValueHashMap {
 
  public static void main(String[] args) {
 
    // Create a HashMap and populate it with elements
    HashMap hashMap = new HashMap();
    hashMap.put("key_1","value_1");
    hashMap.put("key_2","value_2");
    hashMap.put("key_3","value_3");
 
    // boolean containsValue(Object key) returns true if the HashMap contains the value, otherwise false.
    boolean exists = hashMap.containsValue("value_2");
    System.out.println("value_2 exists in HashMap ? : " + exists);
  }
}

Output:

value_2 exists in HashMap ? : true

 
This was an example of how to check a value existence in HashMap in Java.

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