A thing of beauty!

gistfile1.java

private <S, T extends S> void replace(
        List<S> elements,
        Class<T> classOfElementsToRemove,
        Class<? extends T> classOfElementToAdd) {
    elements.removeAll(toList(filterByType(elements, classOfElementsToRemove)));
    try {
        elements.add(classOfElementToAdd.newInstance());
    } catch (InstantiationException exception) {
        throw new RuntimeException(exception);
    } catch (IllegalAccessException exception) {
        throw new RuntimeException(exception);
    }
}