Method keySet

src/main/java/pascal/taie/util/collection/MultiMap.java:138–138

@return an unmodifiable view of all distinct keys contained in this multimap. Note that the key set contains a key if and only if this multimap maps that key to at least one value.

()

     * this multimap maps that key to at least one value.
     */
    Set<K> keySet();

    /**
     * @return an unmodifiable view collection containing the <i>value</i>