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Collections enumeration() method in Java with Examples
  • Last Updated : 08 Oct, 2018
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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() method



Example 1:




// 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 elemnet 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);
        }
    }
}
Output:
List: [Ram, Gopal, Verma]

Enumeration over list: 
Value is: Ram
Value is: Gopal
Value is: Verma

Example 2:




// 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 elemnet 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);
        }
    }
}
Output:
List: [20, 30, 40]

Enumeration over list: 
Value is: 20
Value is: 30
Value is: 40

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