Functions
Returns true if this multimap contains a mapping for the specified key.
Returns the Collection of values to which the specified key is mapped, or null if this multimap contains no mapping for the key.
Removes this key (and its corresponding value) from this multimap.
Removes the specified value with the specified key in this multimap.
Adds the specified value with the specified key in this multimap.
Associate the specified key with the given value if this key is not present within the multimap.
Removes the mapping for the specified key from this multimap if present and returns the Collection of previous values associated with key, or null if there was no mapping for key.
Removes the entry for the specified key only if it is currently mapped to the specified value and return true if removed.
Removes the mapping for the specified key from the multimap if present.