Java ConcurrentHashMap newKeySet() Method

by Online Tutorials Library July 22, 2022

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  ConcurrentHashMap.KeySetView newKeySet()    public static  ConcurrentHashMap.KeySetView newKeySet(int initialCapacity)  ,boolean>,boolean>

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 hashmap = ConcurrentHashMap.newKeySet();          hashmap.add(“AA”);          hashmap.add(“BBB”);           hashmap.add(“CCC”);           hashmap.add(“DDD”);            System.out.println(” Mappings : “+ hashmap);       }   }   

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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 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

Next TopicJava ConcurrentHashMap

Java ConcurrentHashMap newKeySet() Method

Java ConcurrentHashMap newKeySet() Method

Syntax

Parameter

Returns

Throws

Example 1

Example 2

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