ITERATORS

/* Programmer : Dandy A. Macaubos
  Program name : Iterators
  Date Started : March 2,2009
  Date Finished : March 2,2009
  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("1");
  arrayList.add("2");
  arrayList.add("3");
  arrayList.add("4");
  arrayList.add("5");
 
  //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...
1
2
3
4
5
*/

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


What I did I learned in this topic?

I learned that before you can access a collection through an iterator, you must obtain one. 
Each of the collection classes provides an iterator( ) method that returns an iterator to the start of the collection.
By using this iterator object, you can access each element in the collection, one element at a time.

*/