Public void trimToSize() Trims the capacity of this ArrayList to be the ArrayList's current The ArrayList has initial capacity of 110% the size Public ArrayList( Collection c) Constructs an ArrayList containing the elements of the specified Public ArrayList() Constructs an empty ArrayList. Public ArrayList(int initialCapacity) Constructs an empty ArrayList with the specified initial capacity. Trims the capacity of this ArrayList to be the ArrayList's current Returns an array containing all of the elements in this ArrayList in the Returns an array containing all of the elements in this ArrayList Returns the number of components in this ArrayList. Replaces the element at the specified position in this ArrayList with Removes the element at the specified position in this ArrayList. Returns the index of the last occurrence of the specified object in Tests if this ArrayList has no components. Searches for the first occurence of the given argument, testing Returns the element at the specified position in this ArrayList. That it can hold at least the number of components specified by Increases the capacity of this ArrayList, if necessary, to ensure Returns true if this ArrayList contains the specified element. Returns a shallow copy of this ArrayList. Removes all of the elements from this ArrayList. Inserts all of the elements in the specified Collection into thisĪrrayList, starting at the specified position. This this ArrayList, in the order that they are returned by the Inserts the specified element at the specified position in thisĪppends the specified element to the end of this ArrayList.Īppends all of the elements in the specified Collection to the end of AbstractListĬonstructs an ArrayList containing the elements of the specifiedĬollection, in the order they are returned by the Collection'sĬonstructs an empty ArrayList with the specified initial capacity. Modification, the Iterator fails quickly and cleanly, rather than riskingĪrbitrary, non-deterministic behavior at an undetermined time in the future.Ĭollections.synchronizedList(List), Serialized Formįields inherited from class java.util. Iterator's own remove or add methods, the Iterator will throw aĬoncurrentModificationException. Methods are fail-fast: if the ArrayList is structurally modifiedĪt any time after the Iterator is created, in any way except through the The Iterators returned by ArrayList's iterator and listIterator List list = Collections.synchronizedList(new ArrayList(.)) To prevent accidental unsynchronized access to the ArrayList: If no such objectĮxists, the ArrayList should be "wrapped" using theĬollections.synchronizedList method. Object that naturally encapsulates the ArrayList. Modification.) This is typically accomplished by synchronizing on some That adds or deletes one or more elements, or explicitly resizes theīacking array merely setting the value of an element is not a structural (A structural modification is any operation The threads modifies the ArrayList structurally, it must be Multiple threads access an ArrayList concurrently, and at least one of Note that this implementation is not synchronized. This may reduce the amount of incremental reallocation. An application can increase the capacity of an ArrayList beforeĪdding a large number of components using the ensureCapacity Specified beyond the fact that adding an element to an ArrayList hasĬonstant amortized cost, that is, adding n elements requires O(n) As elements are added an ArrayList, itsĬapacity grows automatically. Size of the array used to store the elements in the List. TheĬonstant factor is low compared to that for LinkedList.Įach ArrayList has a capacity. The ArrayList to exceed its capacity, in which case it runs in linear time.Īll of the other operations run in linear time (roughly speaking). The add() operation runs in constant time unless it causes The size, isEmpty, get, set, iterator, and listIterator operations run inĬonstant time. (ArrayList is roughly equivalent to Vector, except that it is To manipulate the size of the array that is used internally to store the InĪddition to implementing the List interface, ArrayList provides methods Optional List operations, and permits all elements, including null. Resizable-array implementation of the List interface. Public class ArrayList extends AbstractList implements List, Cloneable, Serializable
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