functional programming fanservice

list_filter.java

/**
 * FP fanservice
 */
  
private interface Predicate<T> {
    public boolean evaluate(final T item);
}
  
protected <T> Collection<T> filter(final Collection<T> collection, final Predicate<T> predicate) {
    final Collection<T> filtered = new ArrayList<T>();
    for (final T element : collection) {
        if (predicate.evaluate(element)) {
            filtered.add(element);
        }
    }
    return filtered;
}