RealmMap is used to map keys to values.
RealmMaps cannot contain duplicate keys and each key can be mapped to at most one value.
RealmMaps cannot have
null keys but can have
RealmMaps can only have
String keys and should not be used to define properties in RealmObjects. If you need to use a
Map<String, V> or a dictionary-type data structure for your model you should use RealmDictionary.
the type of the keys stored in this map
the type of the values stored in this map