Does Hashmap Use Hashtable Internally?

HashMap internally uses HashTable implementation. This HashMap class extends AbstractMap class that implements the Map interface. Few important points to about HashMap : HashMap uses its static inner class Node<K,V> for storing the entries into the map.

What does HashMap use internally?

HashMap contains an array of the nodes, and the node is represented as a class. It uses an array and LinkedList data structure internally for storing Key and Value.

What does Hashtable use internally?

Hashtable internally contains buckets in which it stores the key/value pairs. The Hashtable uses the key's hashcode to determine to which bucket the key/value pair should map. The function to get bucket location from Key's hashcode is called hash function.