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As a result ArrayList is slower than LinkedList and the latter is preferred in case you need to perform insert and delete operations in the middle of a collection.LinkedList worked 200 times faster than ArrayList when 0.1 million elements were inserted at the start of the collection.
Now you have 1000 linked lists. I think the head of each of these will be in contiguous space, and then the rest of the nodes will be placed where they fit in linked list fashion. Lowest0ne (1536). An array of lists is a type of hash table. It's actually a good data structure, provided the lists don't get too long.