Immutable map of keys to lists of values.
Implementations of this interface should be thread safe.
Elizabeth Paige Harper https://github.com/Foxcapades
v0.3.0
Type of the keys in this ListMap
Type of the values in the lists in this ListMap
Tests whether this ListMap contains the given key.
Retrieves the list of values at the given key in this ListMap.
Whether this ListMap is empty.
Whether this ListMap is not empty.
Number of lists in this ListMap.
Total number of values in all lists in this ListMap.