Java ConcurrentHashMap contains() Method

The contains() method of ConcurrentHashMap class tests if some key maps into the specified value in this table.

Syntax

Parameter

value - a value to search for.

Returns

true if some key maps to the value argument in this table as determined by the equals method; false otherwise

Throws

NullPointerException

Example 1

import java.util.*; 
import java.util.concurrent.*; 
  
public class ConcurrentHashMapcontainsExample1  { 
    public static void main(String[] args) 
    { 
        ConcurrentHashMap<String, Integer>  map = new ConcurrentHashMap<String,  Integer>(); 
  
        map.put("java", 10); 
        map.put(".net", 15); 
        map.put("python", 20); 
        map.put("c", 25); 
        map.put("c++", 30); 

        System.out.println(" Mappings are: " +map); 

        System.out.println("is c  present? ::  " + map.contains(25)); 
 
    } 
}

Test it Now

Output:

Mappings are: {python=20, c++=30, java=10, c=25, .net=15}
is c  present? ::  true

Example 2

import java.util.concurrent.*;   
import java.util.*;   
public class ConcurrentHashMapcontainsExample2 {   
    public static void main(String[] args) 
    { 
        ConcurrentHashMap<String, Integer>  mapcon = new ConcurrentHashMap<String,Integer>(); 
        mapcon.put("Delhi", 100); 
        mapcon.put("Noida", 200); 
        mapcon.put("Mumbai", 300); 
        mapcon.put("Keral", 400); 
  
        System.out.println(" Mappings are: " +mapcon); 

        System.out.println("is c  present? ::  " + mapcon.contains(900));  //checks if map contains 900.
    } 
}

Test it Now

Output:

Mappings are: {Delhi=100, Keral=400, Noida=200, Mumbai=300}
is c  present? ::  false

Next TopicJava ConcurrentHashMap

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