Method containsKey

src/main/java/pascal/taie/util/collection/MultiMap.java:72–72

@return true if this multimap contains at least one key-value pair with the key key.

(K key)

     * with the key {@code key}.
     */
    boolean containsKey(K key);

    /**
     * @return {@code true} if this multimap contains at least one key-value pair