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
// Java program to demonstrate// enumeration() method// for String valueimport 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); } }} |
Output:
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 valueimport 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); } }} |
Output:
List: [20, 30, 40] Enumeration over list: Value is: 20 Value is: 30 Value is: 40
