ListTransformation.java

public class ListTransformation {
    private ListTransformation() { /* empty */ }

    public static <T> List<T> collect(List<T> inputList, Predicate<T> predicate) {
        List<T> newList = new ArrayList(inputList);
        Iterator<T> iterator = newList.iterator();

        while (iterator.hasNext()) {
            try {
                if (!predicate.check(iterator.next())) {
                    iterator.remove();
                }
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }

        return newList;
    }

    public static <T> List<T> filter(List<T> inputList, Predicate<T> predicate) {
        return collect(inputList, not(predicate));
    }

    public static <T> Predicate<T> not(final Predicate<T> predicate) {
        return new Predicate<T>() {
            public boolean check(T input) throws Exception {
                return !predicate.check(input);
            }
        };
    }

    public static interface Predicate<T> {
        public boolean check(T input) throws Exception;
    }
}