Java ConcurrentHashMap keys() Method

by Online Tutorials Library July 22, 2022

Java ConcurrentHashMap keys() Method

The keys() method of ConcurrentHashMap class returns an enumeration of the keys in this table.

Syntax

Parameter

No parameter is passed.

Returns

an enumeration of the keys in this table

Throws

No exception is thrown.

Example 1

  import java.util.*;   import java.util.concurrent.*;       public class ConcurrentHashMapKeysExample1 {       public static void main(String[] args)       {           ConcurrentHashMap  conmap = new ConcurrentHashMap();           conmap.put(10, “Java”);           conmap.put(11, “.net”);           conmap.put(20, “php”);           conmap.put(12, “C”);           conmap.put(30, “C++”);           // print statement          System.out.println(” Map : ” + conmap);           Enumeration enumr = conmap.keys();           System.out.println(” enumeration of keys are:”);           while (enumr.hasMoreElements()) {               System.out.println(enumr.nextElement());           }       }   }  ,>,>

Test it Now

Output:

enumeration of keys are:  20  10  11  12  30

Example 2

  import java.util.*;   import java.util.concurrent.*;       public class ConcurrentHashMapKeysExample2 {       public static void main(String[] args)       {           ConcurrentHashMap  conmap = new ConcurrentHashMap();           conmap.put(“A”, “Java”);           conmap.put(“B”, “.net”);           conmap.put(“C”, “php”);           conmap.put(“D”, “C”);           conmap.put(“E”, “C++”);          // print statement          System.out.println(” Map : ” + conmap);           Enumeration enumr = conmap.keys();           System.out.println(” enumeration of keys are:”);           while (enumr.hasMoreElements()) {               System.out.println(enumr.nextElement());           }       }   }  ,>

Test it Now

Output:

enumeration of keys are:  A  B  C  D  E

Next TopicJava ConcurrentHashMap

Java ConcurrentHashMap keys() Method

Java ConcurrentHashMap keys() Method

Syntax

Parameter

Returns

Throws

Example 1

Example 2

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