Java ConcurrentHashMap containsValue() Method

The containsValue() method of ConcurrentHashMap class returns true if this map maps one or more keys to the specified value. Note: This method may require a full traversal of the map, and is much slower than method containsKey.

Syntax

Parameter

value - value whose presence in this map is to be tested

Returns

true if this map maps one or more keys to the specified value

Throws

NullPointerException

Example 1

import java.util.*; 
import java.util.concurrent.*; 
  
public class ConcurrentHashMapcontainsValueExample1  { 
    public static void main(String[] args) 
    { 
        ConcurrentHashMap<String, Integer>  mymap = new ConcurrentHashMap<String,  Integer>(); 
  
        mymap.put("AAA", 10); 
        mymap.put("BBB", 15); 
        mymap.put("CCC", 25); 
        mymap.put("DDD", 255); 
        mymap.put("EEE",30); 
        System.out.println(" Mappings are: " +mymap); 

        System.out.println("is 255  present? ::  "
                           + mymap.containsValue(255)); 
 
    } 
}

Test it Now

Output:

Mappings are: {AAA=10, CCC=25, BBB=15, EEE=30, DDD=255}
is 255  present? ::  true

Example 2

import java.util.concurrent.*; 
  
public class ConcurrentHashMapcontainsValueExample2  { 
  
    public static void main(String[] args) 
    { 
        ConcurrentHashMap<String, Integer> mapcon = new ConcurrentHashMap<>(); 
        mapcon.put("A", 26); 
        mapcon.put("B", 98); 
        mapcon.put("C", 55);        
        System.out.println("ConcurrentHashMap values :\n "+ mapcon.toString());  
         mapcon.computeIfPresent("C", (key , val)  -> val + 100); 
        System.out.println("new ConcurrentHashMap after  computeIfPresent :\n " + mapcon); 
        System.out.println(" is 98 is present  :\n " + mapcon.containsValue(98)); 
        
    } 
}

Test it Now

Output:

ConcurrentHashMap values :
 {A=26, B=98, C=55}
new ConcurrentHashMap after  computeIfPresent :
 {A=26, B=98, C=155}
 is 98 is present  :
 true

Next TopicJava ConcurrentHashMap

← prev next →

For Videos Join Our Youtube Channel: Join Now

Feedback

Send your Feedback to [email protected]

Help Others, Please Share

Learn Latest Tutorials

Splunk

SPSS

Swagger

Transact-SQL

Tumblr

ReactJS

Regex

Reinforcement Learning

R Programming

RxJS

React Native

Python Design Patterns

Python Pillow

Python Turtle

Keras

Preparation

Aptitude

Reasoning

Verbal Ability

Interview Questions

Company Questions

Trending Technologies

Artificial Intelligence

AWS

Selenium

Cloud Computing

Hadoop

ReactJS

Data Science

Angular 7

Blockchain

Git

Machine Learning

DevOps

B.Tech / MCA

DBMS

Data Structures

DAA

Operating System

Computer Network

Compiler Design

Computer Organization

Discrete Mathematics

Ethical Hacking

Computer Graphics

Software Engineering

Web Technology

Cyber Security

Automata

C Programming

C++

Java

.Net

Python

Programs

Control System

Data Mining

Data Warehouse

^{Like/Subscribe us for latest updates or newsletter}