Internal working of array list, linked list and hash map.

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Array list, linked list and hash map are data structures used to store and manipulate data.

Array list stores data in contiguous memory locations and allows random access to elements.
Linked list stores data in nodes that are linked to each other and allows efficient insertion and deletion of elements.
Hash map stores data in key-value pairs and allows fast retrieval of values based on keys.
Array list and linked list are both used for sequential access of elements, while hash map is used for associative access.
Array list and linked list have O(n) time complexity for searching, while hash map has O(1) time complexity for searching.

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