Method containsKey

lab07/src/ULLMap.java:54–59

Returns true if and only if this dictionary contains KEY as the key of some key-value pair.

(K key)

    /** Returns true if and only if this dictionary contains KEY as the
     *  key of some key-value pair. */
    public boolean containsKey(K key) {
        if (list == null) {
            return false;
        }
        return list.get(key) != null;
    }

    @Override
    public Iterator<K> iterator() {