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ConcurrentHashMap elements() method in Java with Examples

Last Updated : 30 Oct, 2018
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The elements() method of ConcurrentHashMap class in Java is used to get the enumeration of the values present in the table. Syntax: 
Enumeration enu = ConcurrentHashMap.elements()
Parameters: The method does not take any parameters. Return value: The method returns an enumeration of the values of the HashMap. Below programs are used to illustrate the working of the elements() method: Program 1: Java 
// Java code to illustrate the elements() method import java.util.*; import java.util.concurrent.*; public class ConcurrentHashMap_Demo {  public static void main(String[] args)  {  // Creating an empty hash_map  ConcurrentHashMap<Integer, String>  hash_map = new ConcurrentHashMap<Integer,  String>();  // Mapping elements into the map  hash_map.put(10, "Geeks");  hash_map.put(15, "4");  hash_map.put(20, "Geeks");  hash_map.put(25, "Welcomes");  hash_map.put(30, "You");  // Displaying the hash_map  System.out.println("The Map is: " + hash_map);  // Creating an empty enumeration to store  Enumeration enu = hash_map.elements();  System.out.println("The enumeration of values are:");  // Displaying the Enumeration  while (enu.hasMoreElements()) {  System.out.println(enu.nextElement());  }  } }
Output: 
 The Map is: {20=Geeks, 25=Welcomes, 10=Geeks, 30=You, 15=4} The enumeration of values are: Geeks Welcomes Geeks You 4
Program 2: Java 
// Java code to illustrate the elements() method import java.util.*; import java.util.concurrent.*; public class ConcurrentHashMap_Demo {  public static void main(String[] args)  {  // Creating an empty hash_map  ConcurrentHashMap<String, Integer>  hash_map = new ConcurrentHashMap<String,  Integer>();  // Inserting elements into the map  hash_map.put("Geeks", 10);  hash_map.put("4", 15);  hash_map.put("Geeks", 20);  hash_map.put("Welcomes", 25);  hash_map.put("You", 30);  // Displaying the hash_map  System.out.println("The Map is: " + hash_map);  // Creating an empty enumeration to store  Enumeration enu = hash_map.elements();  System.out.println("The enumeration of values are:");  // Displaying the Enumeration  while (enu.hasMoreElements()) {  System.out.println(enu.nextElement());  }  } }
Output: 
 The Map is: {4=15, Geeks=20, You=30, Welcomes=25} The enumeration of values are: 15 20 30 25

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