What are the differences between ArrayList and LinkedList

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The implementation of ArrayList is based on arrays, and the implementation of LinkedList is based on doubly linked lists.

ArrayList is better than LinkedList for random access

LinkedList is better than ArrayList for insert and delete operations

LinkedList takes up more memory than ArrayList because LinkedList nodes store two references in addition to data, one pointing to the previous element and one pointing to the next element.

Supplement: ArrayList uses a built-in array to store elements, the starting capacity is 10, when the array needs to expand, the expansion formula: (old * 3) / 2 + 1, that is, each time the capacity will increase by 50%. This means that if you include a large number of elements, you will waste a lot of space. This waste is determined by the ArrayList itself.

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