What class would you use to insert an element into a HashMap data structure?

To insert an element into a HashMap data structure in Java, the HashMap class itself is used. The insertion of an element is done using the put(key, value) method of this class.

Example:

import java.util.HashMap;

HashMap<String, Integer> map = new HashMap<>();
map.put("apple", 3); // inserting an element with key "apple" and value 3

Thus, no separate class is needed for insertion; the put method of the HashMap class is used.