import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;

class SimpleIterator {

	public static void removeLongStrings(Collection<String> c, int maxLen) {
		Iterator<String> it = c.iterator();
		while (it.hasNext()) {
			String str = it.next();
			if (str.length() > maxLen) {
				it.remove();
			}
		}
	}

	public static void brokenRemoveLongStrings(Collection<String> c, int maxLen) {
		for (String str : c) {
			if (str.length() > maxLen) {
				c.remove(str); // error: removing element inside for-each
			}
		}
	}
	public static void main(String[] args) {
		Collection<String> bag = new HashSet<String>();
		bag.add(new String("Some text"));
		bag.add(new String("Some longer text"));
		bag.add(new String("Some very very very long text"));

		System.out.println(bag);

		removeLongStrings(bag, 15);
		// brokenRemoveLongStrings(bag, 15); commented out to avoid exception

		System.out.println(bag);

	}
}