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How ArrayList Works Internally in Java | Dynamic Array, Resizing & O(1) amortised | Interview
In this video I explain how ArrayList works internally in Java — the backing Object array, the 1.5x resize algorithm, amortised O(1) add(), and when to use ArrayList vs LinkedList vs ArrayDeque. Includes 5 interview questions and 3 production gotchas. Chapters: 0:00 Default capacity surprise 1:04 Internal structure — Object[] elementData 2: ...
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