![]() If multiple threads access an ArrayList instance concurrently, and at least one of the threads modifies the list structurally, it must be synchronized externally. Note that this implementation is not synchronized. ![]() The details of the growth policy are not specified beyond the fact that adding an element has constant amortized time cost. As elements are added to an ArrayList, its capacity grows automatically. It is always at least as large as the list size. The capacity is the size of the array used to store the elements in the list. Each ArrayList instance has a capacity.(This class is roughly equivalent to Vector, except that it is unsynchronized.) 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. Implements all optional list operations, and permits all elements, including null. Resizable-array implementation of the List interface.Lists allow multiple null elements if they allow null elements at all.The user can access elements by their integer index (position in the list), and search for elements in the list. The user of this interface has precise control over where in the list each element is inserted. Implementation Classes grouped by their Interfaces ListĪn ordered collection (also known as a sequence). There are only two collections are thread-safe, Vector and Hastable.TreeSet and TreeMap have elements ordered by natural order or by a comparator.** LinkedHashSet and LinkedHashMap have elements ordered by insertion order. Elements within sets and maps are not ordered, except for:.sets and maps do not sort its elements, except TreeSet and TreeMap – which sort elements by natural order or by a comparator.All sets and maps do not allow duplicate elements.All lists allow duplicate elements which are ordered by index.In Short, The following characteristics of the main collections in Java Collection Frameworks:
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