Difference between Map and HashMap
The Map is an interface in Java used to map the key-pair values. It is used to insert, update, remove the elements. Whereas the HashMap is a class of Java collection framework.
The Map interface can only be used with an implementing class. It allows to store the values in key-pair combination; it does not allow duplicate keys; however, we can store the duplicate values. Its implementing classes are as follows:
HashMap is a powerful data structure in Java used to store the key-pair values. It maps a value by its associated key. It allows us to store the null values and null keys. It is a non-synchronized class of Java collection.
Implementation of the Map Interface
The Map interface can be implemented by using the implementing class. Consider the below example:
Nick:2 Abhi:1 Paul:4 Ketty:3
Implementation of the HashMap Class
HashMap class can be declared as follows:
Consider the below example to implement the HashMap:
Iterating Hashmap... 1 Chris 2 Morris 3 Sam 4 Cruise
Key Differences between Map and HashMap
Some key differences between the Map and HashMap are as follows: