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. In addition to implementing the List interface, this class provides methods to manipulate the size of the array that is used internally to store the list. (This class is roughly equivalent to Vector, except that it is unsynchronized.) Description The Java ArrayList addAll (Collection
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