Web Reference: As elements are added to an ArrayList, its capacity grows automatically. The details of the growth policy are not specified beyond the fact that adding an element has constant amortized time cost. Mar 14, 2026 · The add () method in Java ArrayList is used to insert elements into the list dynamically. It allows adding elements either at the end of the list or at a specific index position. Definition and Usage The add() method adds an item to the list. If an index is provided then the new item will be placed at the specified index, pushing all of the following elements in the list ahead by one. If an index is not provided then the new item will be placed at the end of the list.
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