Java ConcurrentHashMap newKeySet() Method

The newKeySet() method of ConcurrentHashMap class Creates a new set backed by a ConcurrentHashMap from the given type to Boolean.TRUE.

Syntax

public static <K> ConcurrentHashMap.KeySetView<K,Boolean> newKeySet()

public static <K> ConcurrentHashMap.KeySetView<K,Boolean> newKeySet(int initialCapacity)

Parameter

No parameter is passed.

Returns

the new set

Throws

No exception is thrown.

Example 1

import java.util.Set;
import java.util.concurrent.*; 
  
class ConcurrentHashMapnewKeySetExample1 { 
    public static void main(String[] args) 
    { 
        Set<String> hashmap = ConcurrentHashMap.newKeySet();
        hashmap.add("AA");
        hashmap.add("BBB"); 
        hashmap.add("CCC"); 
        hashmap.add("DDD");  
        System.out.println(" Mappings : "+ hashmap); 
    } 
} 

Test it Now

Output:

Mappings : [AA, CCC, BBB, DDD]

Example 2

import java.util.Set;
import java.util.concurrent.*; 
  
class ConcurrentHashMapnewKeySetExample2  { 
    public static void main(String[] args) 
    { 
        Set<String> hashmap = ConcurrentHashMap.newKeySet(6);
        hashmap.add("AA");
        hashmap.add("BBB"); 
        hashmap.add("CCC"); 
        hashmap.add("DDD");  
        System.out.println(" Mappings : "+ hashmap); 
        System.out.println(" Mapping size : "+ hashmap.size()); 
    } 
}

Test it Now

Output:

Mappings : [AA, CCC, BBB, DDD]
 Mapping size : 4

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