Web Reference: Definition and Usage The indexOf() method returns the position of the first occurrence of a value in the list. If the item is not found in the list then it returns -1. The size, isEmpty, get, set, iterator, and listIterator operations run in constant time. The add operation runs in amortized constant time, that is, adding n elements requires O(n) time. All of the other operations run in linear time (roughly speaking). The constant factor is low compared to that for the LinkedList implementation. Dec 10, 2024 · The indexOf () method in Java is used to find the index of the first occurrence of a specified element in an ArrayList. Example 1: Here, we will use the indexOf () method to find the index of a specific element in an ArrayList.
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