Method removeAll

lib/java/util/AbstractSet.java:97–115

Removes all occurrences in this collection which are contained in the specified collection. @param collection the collection of objects to remove. @return true if this collection was modified, false otherwise. @throws UnsupportedOperationException i

(Collection<?> collection)

     *                if removing from this collection is not supported.
     */
    @Override
    public boolean removeAll(Collection<?> collection) {
        boolean result = false;
        if (size() <= collection.size()) {
            Iterator<?> it = iterator();
            while (it.hasNext()) {
                if (collection.contains(it.next())) {
                    it.remove();
                    result = true;
                }
            }
        } else {
            Iterator<?> it = collection.iterator();
            while (it.hasNext()) {
                result = remove(it.next()) || result;
            }
        }
        return result;
    }
}