Java Glossary : iterator

Java definitions: 0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

You are here : home : Java Glossary : I words : iterator.

iterator

Iterators let you process each element of a collection.

// ITERATOR USE
for ( Iterator iter = myList.iterator(); iter.hasNext(); )
   {
   String key = (String) iter.next();
   System.out.println( key );
   }

Note how iterators deliver raw Objects with the next method. It is up to you to cast them back to what they really are.

Here is how a simple Iterator works inside:

view
Here is how a more realistic one works that implements ListIterator.

view

design patterns

home	Canadian Mind Products
	mindprod.com IP:[24.87.56.253]
	Your IP:[80.134.30.163]
	You are visitor number 3837.
	Please send errors, omissions and suggestions
	to improve this page to Roedy Green.
	You can get a fresh copy of this page from:	or possibly from your local J: drive mirror:
	http://mindprod.com/jgloss/iterator.html	J:\mindprod\jgloss\iterator.html