HashMap in java(Collection Framework Map Interface) tutorial-33 latest (2019)
HashpMap (Map interface, Collections ) in Java :HashMap allows us to store values associated with the keys or the information is stored in HashMap in key-value pairs.A Map cannot contain duplicate keys. You can get the object from a Map using a key. HashMap provide no guarantee of ordering. HashMap Allows null key and null values. HashMap offers constant time access for general method to get, put and contains values.An object of Map represents a group of objects, each of which is associated with a key.