Collections enumeration() method in Java with Examples
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 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); } } } |
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 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); } } } |
Output:
List: [20, 30, 40] Enumeration over list: Value is: 20 Value is: 30 Value is: 40