Comments on: For Each Loop in Java 5 http://www.myhomepageindia.com/index.php/2009/07/03/for-each-loop-in-java-5.html Travel Articles and Tech Notes Tue, 10 Aug 2010 23:11:36 +0000 http://wordpress.org/?v=2.9 hourly 1 By: OHaleck http://www.myhomepageindia.com/index.php/2009/07/03/for-each-loop-in-java-5.html/comment-page-1#comment-221 OHaleck Tue, 07 Jul 2009 06:57:00 +0000 http://www.myhomepageindia.com/?p=865#comment-221 "This for loop has removed the iterator..." - the iterator is not called explicitly, but it is still used inside the foreach loop. “This for loop has removed the iterator…” – the iterator is not called explicitly, but it is still used inside the foreach loop.

]]> By: OHaleck http://www.myhomepageindia.com/index.php/2009/07/03/for-each-loop-in-java-5.html/comment-page-1#comment-220 OHaleck Tue, 07 Jul 2009 06:54:59 +0000 http://www.myhomepageindia.com/?p=865#comment-220 Don't forget you sometimes just need Iterator in order to do modifications (e.g. delete elements) during the iteration. The Iterator interface supports generics so you can use a nicer version of it without having to cast: public class GoodForLoop { public static void main(String[] args) { List list = new ArrayList(2); list.add("First"); list.add("Second"); String str = null; for(Iterator itr = list.iterator(); itr.hasNext();){ str = itr.next(); System.out.println(str); } } } Also, the first example can be modified to use generics and, since Java has nothing that allows one to iterate over two collections at a time, the "classic" version of the loop must be used to do so. Don’t forget you sometimes just need Iterator in order to do modifications (e.g. delete elements) during the iteration. The Iterator interface supports generics so you can use a nicer version of it without having to cast:

public class GoodForLoop {
public static void main(String[] args) {
List list = new ArrayList(2);
list.add(“First”);
list.add(“Second”);
String str = null;
for(Iterator itr = list.iterator(); itr.hasNext();){
str = itr.next();
System.out.println(str);
}
}
}

Also, the first example can be modified to use generics and, since Java has nothing that allows one to iterate over two collections at a time, the “classic” version of the loop must be used to do so.

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