Description Maxime Daniel 2006-06-21 10:22:34 EDT

Version: 3.2.0
Build id: I20060614-0843

The following source code:

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
public class X {
	public static void main(String[] args) {
		Set<X> set = new HashSet<X>();
		for (Iterator<X> iterator = set.iterator(); iterator.hasNext();) {
			Set<X> element = (Set<X>) iterator.next(); // warning
		}
	}
}

gets an unchecked warning on the cast with javac 1.5.0_08 and 6.0 b86. Eclipse does not complain.
Arguably, the return type of iterator.next() is X, which cannot be cast to Set<X>.
Note that (boolean) iterator.next() or (Integer) iterator.next() both raise plain errors with javac and eclipse.
All other things being equal, getting X to implement Set<X> silences the unchecked warning raised by javac.