What type of data and information is contained in each element of the internal array structure used in HashMap implementation?

In the implementation of HashMap in Java, the internal array consists of elements that typically represent nodes (Node or Entry). Each such element contains the following data:

• Key — the object used for searching the value.
• Value — the object associated with the key.
• Hash code of the key — an integer value computed based on the key, used to determine the position in the array.
• Reference to the next element — a link to the next node in the chain for collision handling (if multiple keys have the same hash).

Thus, each element of the array is a linked list (or a tree in newer Java versions) of nodes, where each node stores a key-value pair and information for resolving collisions.