Collections enumeration() method in Java with Examples - GeeksforGeeks

08 Jun, 2021
The enumeration() method of java.util.Collections class is used to return an enumeration over the specified collection. This provides interoperability with legacy APIs that require an enumeration as input.Syntax:  
public static  Enumeration enumeration(Collection c)
Parameters: This method takes the collection c as a parameter for which an enumeration is to be returned.Return Value: This method returns an enumeration over the specified collection.Below are the examples to illustrate the enumeration() methodExample 1:  
Java
// Java program to demonstrate// enumeration() method// for String value import java.util.*; public class GFG1 {    public static void main(String[] argv) throws Exception    {        try {             // creating object of List<String>            List<String> arrlist = new ArrayList<String>();             // Adding element to srclst            arrlist.add("Ram");            arrlist.add("Gopal");            arrlist.add("Verma");             // Print the list            System.out.println("List: " + arrlist);             // creating object of type Enumeration<String>            Enumeration<String> e = Collections.enumeration(arrlist);             // Print the Enumeration            System.out.println("\nEnumeration over list: ");             // print the enumeration            while (e.hasMoreElements())                System.out.println("Value is: " + e.nextElement());        }         catch (IllegalArgumentException e) {            System.out.println("Exception thrown : " + e);        }         catch (NoSuchElementException e) {            System.out.println("Exception thrown : " + e);        }    }}
List: [Ram, Gopal, Verma]

Enumeration over list: 
Value is: Ram
Value is: Gopal
Value is: Verma
 
Example 2:  
Java
// Java program to demonstrate// enumeration() method// for Integer value import java.util.*; public class GFG1 {    public static void main(String[] argv) throws Exception    {        try {             // creating object of List<Integer>            List<Integer> arrlist = new ArrayList<Integer>();             // Adding element to srclst            arrlist.add(20);            arrlist.add(30);            arrlist.add(40);             // Print the list            System.out.println("List: " + arrlist);             // creating object of type Enumeration<Integer>            Enumeration<Integer> e = Collections.enumeration(arrlist);             // Print the Enumeration            System.out.println("\nEnumeration over list: ");             // print the enumeration            while (e.hasMoreElements())                System.out.println("Value is: " + e.nextElement());        }         catch (IllegalArgumentException e) {            System.out.println("Exception thrown : " + e);        }         catch (NoSuchElementException e) {            System.out.println("Exception thrown : " + e);        }    }}
List: [20, 30, 40]

Enumeration over list: 
Value is: 20
Value is: 30
Value is: 40
 
anikakapoor
Java - util package
Java-Collections
Java-Functions
Java
Java
Java-Collections
Writing code in comment?
Please use ide.geeksforgeeks.org,
generate link and share the link here.
Stream In Java
Exceptions in Java
Constructors in Java
Functional Interfaces in Java
Different ways of Reading a text file in Java
Generics in Java
Comparator Interface in Java with Examples
Introduction to Java
PriorityQueue in Java
How to remove an element from ArrayList in Java?