Home » Java programming language

Java Collections enumeration() Method with Example

Collections Class enumeration() method: Here, we are going to learn about the enumeration() method of Collections Class with its syntax and example.
Submitted by Preeti Jain, on February 03, 2020

Collections Class enumeration() method

• enumeration() method is available in java.util package.
• enumeration() method is used to return an Enumeration object of the given Collection(co).
• enumeration() method is a static method, so it is accessible with the class name and if we try to access the method with the class object then also we will not get an error.
• enumeration() method does not throw an exception at the time of returning enumeration objects.

Syntax:

    public static Enumeration enumeration(Collection co);

Parameter(s):

• Collection co – represents the Collection for which an enumeration is to be get.

Return value:

The return type of this method is Enumeration, it returns enumeration over the given Collection (co).

Example:

// Java program is to demonstrate the example
// of Enumeration enumeration() of Collections

import java.util.*;
public class EnumerationOfCollections {
    public static void main(String args[]) {

        // Instantiate a LinkedList   
        List link_l = new LinkedList();

        // By using add() method is to
        // add elements in linked list
        link_l.add(10);
        link_l.add(20);
        link_l.add(30);
        link_l.add(40);
        link_l.add(50);

        // Display LinkedList
        System.out.println("link_l: " + link_l);
        System.out.println();

        // By using enumeration() method is to
        // return the enumeration view of the 
        // given collection linked list
        Enumeration en = Collections.enumeration(link_l);

        System.out.println("Collections.enumeration(link_l): ");

        while (en.hasMoreElements()) {
            System.out.println("linked list elements: " + en.nextElement());
        }
    }
}

Output

link_l: [10, 20, 30, 40, 50]

Collections.enumeration(link_l): 
linked list elements: 10
linked list elements: 20
linked list elements: 30
linked list elements: 40
linked list elements: 50