functional "map" for java

map.java

public static <R extends Iterable<K>, K, V> R map(Iterable<V> iter, Function<V, K> func){
	List<K> result = new LinkedList<K>();
	for (V sourceValue : iter) {
		result.add(func.apply(sourceValue));
	}
	return (R)result;
}

public static interface Function<S, R> {
	R apply(S value);
}