Web Reference: Dec 10, 2024 · The addAll () method in the ArrayList class is used to add all the elements from a specified collection into an ArrayList. This method is especially useful for combining collections or inserting multiple elements at once. The ArrayList addAll()method can take two parameters: 1. index(optional) - index at which all elements of a collection is inserted 2. collection- collection that contains elements to be inserted If the indexparameter is not passed the collection is appended at the end of the arraylist. The addAll() method adds all of the items from a collection to the list. If an index is provided then the new items will be placed at the specified index, pushing all of the following elements in the list ahead.
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