Iterator arrayList

/* Programmer : Matiga, Reuben D.
  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
*/
package collection;

import java.util.ArrayList;
import java.util.Iterator;

public class IteratorDemo {
  public static void main(String arg[])
  {
  ArrayList reu=new ArrayList();
  for(int i=0;i<10;i++)
  {
  reu.add(new Integer(i));
  }
  System.out.println(reu); // 0,1,2,3,……9
  Iterator itr=reu.iterator();
  while(itr.hasNext())
  {
  Integer i=(Integer)itr.next();
  if(i.intValue() % 2==0)
  {
  System.out.println(i);
  }
  else
  {
  itr.remove();
  }
  }
   
  }

}


output:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
0
2
4
6
8

Source: http://www.javaexamples4u.com/2009/02/iterator-source-code.html

I learned that iterator is an object representing a stream of data. Repeated calls to the iterator’s next() method return successive items in the stream. When no more data is available a StopIteration exception is raised.


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