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Java Program to demonstrate the use of Enumeration.

Java Code Example — Collection Programs

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Java Program to demonstrate the use of Enumeration.

Objective

Write a Java program to demonstrate the legacy Enumeration interface with a Vector.

Algorithm / Approach

  1. Create a Vector and add the days of the week to it.
  2. Extract an Enumeration object using days.elements().
  3. Use a while loop with the condition d.hasMoreElements().
  4. Retrieve the data using d.nextElement().
Test.java 
import java.util.*;
class Test{
 public static void main(String[] a)
 {
  Enumeration d;
  Vector days = new Vector();
  days.add("Sunday");
  days.add("Monday");
  days.add("Tuesday");
  days.add("Wednesday");
  days.add("Thursday");
  days.add("Friday");
  days.add("Saturday");
  d = days.elements();
  while (d.hasMoreElements()) {
   System.out.println(d.nextElement()); 
  }
 }
}

Expected Output

Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday

Explanation of the Program

  • Enumeration is a legacy interface from Java 1.0. It was the original way to iterate over collections before the Java Collections Framework (and the Iterator interface) was introduced in Java 1.2.
  • Vector is also a legacy class (a synchronized, thread-safe version of ArrayList).
  • While you will rarely write new code using these classes today, you will frequently encounter them when maintaining older legacy Java enterprise applications.

Complexity

Time Complexity O(n)
Space Complexity O(1)
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