What is difference between Enumeration and Iterator interface
Answer : Below shows difference :
| Iterator | Enumeration |
| Iterate over collection | This also iterate over collection |
| Method name made shorter (Method name has been imporoved) | Method name was big |
| Added remove operation that allows to remove elements from collection during iteration | No functionality to remove element form collection |
| It has three method: hasNext(), next() and remove() | It has two method hasMoreElements(),nextElement() |
Please see example below:
package com.javahonk.iteratorenumeration; import java.util.ArrayList; import java.util.Enumeration; import java.util.Iterator; import java.util.List; import java.util.Vector; public class IteratorEnumerationTest { public static void main(String[] args) { List<String> arrayList = new ArrayList<String>(); arrayList.add("Java"); arrayList.add("Honk"); // Iterator example System.out.println("Iterator example:"); Iterator<String> iterator = arrayList.iterator(); while (iterator.hasNext()) { String string = (String) iterator.next(); System.out.println(string); } // Enumeration example although it's not // preferable System.out.println("\nEnumeration example:"); Vector<String> vector = new Vector<String>(); vector.add("Java"); vector.add("Honk"); Enumeration<String> enumeration = vector.elements(); while (enumeration.hasMoreElements()) { String type = (String) enumeration.nextElement(); System.out.println(type); } // Preferable: Use an enhanced for loop // to display contents. System.out.println("\nEnhanced iterator example:"); for (String string : arrayList) { System.out.println(string); } } }
Output:
