Web Reference: Jan 19, 2026 · The following Java program demonstrates how to convert an ArrayList to an array using the toArray () method. This example showcases the basic usage of the ArrayList and how its elements can be retrieved and stored in the array. The toArray() method returns an array containing all of the items in the list. If no argument is passed then the type of the returned array will be Object. If an array is passed as an argument then this method will return an array with the same data type. 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.
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