Java ConcurrentHashMap values() Method

The values() method of ConcurrentHashMap class returns a Collection view of the values contained in this map. The collection is stacked by the map, so changes to the map are reflected in the collection, and vice-versa. The collection supports element removal, which removes the corresponding mapping from this map, via the Iterator

Syntax

Parameter

No parameter is passed.

Returns

the collection view

Throws

No exception is thrown.

Example 1

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

public class ConcurrentHashMapvaluesExample1  {
   public static void main(String args[]) {
      
     ConcurrentHashMap<String , String>  mymap = new ConcurrentHashMap<String ,String>(); 

     ConcurrentHashMap<Integer , Integer>  mymap2 = new ConcurrentHashMap<Integer , Integer>(); 
     
      mymap2.put(1, 101);
      mymap2.put(2, 102);
      mymap2.put(3, 103);
      System.out.println(" mymap2 :" +mymap2.values());
      mymap.put("AA", "Java");
      mymap.put("BB", "angular");
      mymap.put("CC", "JavaScript");
      System.out.println(" mymap :" +mymap.values());
      
      System.out.println("comparing mymap and mymap2 :" +mymap.equals(mymap2));
   }    
}

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Output:

mymap2 :[101, 102, 103]
 mymap :[Java, angular, JavaScript]
comparing mymap and mymap2 :false

Example 2

import java.util.concurrent.*; 
  
import java.util.*; 
  
public class  ConcurrentHashMapvaluesExample2 { 
  
    public static void main(String[] args) 
    { 
          // crete a HashMap and add some values 
        HashMap<String, Integer> mapcon 
            = new HashMap<>(); 
        mapcon.put("k1", 100); 
        mapcon.put("k2", 200); 
        mapcon.put("k3", 300); 
        mapcon.put("k4", 400); 
        System.out.println(" HashMap :\n "+ mapcon.values()); 
    } 
}

Test it Now

Output: