I’ve focused on two data structure categories, Java arrays and linked lists, which are the basis of more complex data structures such as stacks, queues, trees, graphs, dictionaries/maps, and sets.

Arrays or array lists are used when we have a collection of the same types of objects and we want to hold them. Both arrays and array lists have super-fast random access because of using index's.

Implement a doubly linked list. Like an array, a linked list is a simple linear data structure. Several common data types can be implemented using linked lists, like queues, stacks, and associative ...