Method keySet

ij/src/main/java/ij/astro/types/MultiMap.java:105–107

Returns a set of all keys in the MultiMap. @return a set of all keys

()

     * @return a set of all keys
     */
    public Set<K> keySet() {
        return map.keySet();
    }

    public boolean isEmpty() {
        return map.isEmpty();