Iterator

/* Programmer : Ampo, Albert S.
  Program name : Iterators
  Date Started : March 2,2009
  Date Finished : March 3,2009
  Purpose : Iterate through elements Java ArrayList using Iterator
  Instructor : Dony Dongiapon
  Subject : IT134
*/

import java.util.ArrayList;
import java.util.Iterator;
 
public class IterateThroughArrayListUsingIterator {
 
  public static void main(String[] args) {
 
  //create an ArrayList object
  ArrayList arrayList = new ArrayList();
 
  //Add elements to Arraylist
  arrayList.add("a");
  arrayList.add("l");
  arrayList.add("b");
  arrayList.add("e");
  arrayList.add("r");
  arrayList.add("t");
 
  //get an Iterator object for ArrayList using iterator() method.
  Iterator itr = arrayList.iterator();
 
  //use hasNext() and next() methods of Iterator to iterate through the elements
  System.out.println("Iterating through ArrayList elements...");
  while(itr.hasNext())
  System.out.println(itr.next());
 
  }
}
 
/*
Output would be
Iterating through ArrayList elements...
a
l
b
e
r
t
*/

/*source : http://www.java-examples.com/iterate-through-elements-java-arraylist-using-iterator-example



    I learned this topic about iterator is an object that allows a programmer to traverse through all the elements of a collection, regardless of its specific implementation. An iterator is sometimes called a cursor, especially within the context of a database.