new function method HashTable.forEach

gistfile1.java

@SuppressWarnings("unchecked")
@Override
public synchronized void forEach(BiConsumer<? super K, ? super V> action) {
    Objects.requireNonNull(action);     // explicit check required in case
                                        // table is empty.
    final int expectedModCount = modCount;

    Entry<?, ?>[] tab = table;
    for (Entry<?, ?> entry : tab) {
        while (entry != null) {
            action.accept((K)entry.key, (V)entry.value);
            entry = entry.next;

            if (expectedModCount != modCount) {
                throw new ConcurrentModificationException();
            }
        }
    }
}