ArrayList Class
Definition
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Resizable-array implementation of the List interface.
[Android.Runtime.Register("java/util/ArrayList", DoNotGenerateAcw=true)]
[Java.Interop.JavaTypeParameters(new System.String[] { "E" })]
public class ArrayList : Java.Util.AbstractList, IDisposable, Java.Interop.IJavaPeerable, Java.IO.ISerializable, Java.Lang.ICloneable, Java.Util.IRandomAccess[<Android.Runtime.Register("java/util/ArrayList", DoNotGenerateAcw=true)>]
[<Java.Interop.JavaTypeParameters(new System.String[] { "E" })>]
type ArrayList = class
inherit AbstractList
interface ISerializable
interface IJavaObject
interface IDisposable
interface IJavaPeerable
interface ICloneable
interface IList
interface ICollection
interface IIterable
interface IRandomAccess- Inheritance
- Attributes
- Implements
Remarks
Resizable-array implementation of the List interface. Implements all optional list operations, and permits all elements, including null. 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.)
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.
Each ArrayList instance has a capacity. The capacity is the size of the array used to store the elements in the list. It is always at least as large as the list size. As elements are added to an ArrayList, its capacity grows automatically. The details of the growth policy are not specified beyond the fact that adding an element has constant amortized time cost.
An application can increase the capacity of an ArrayList instance before adding a large number of elements using the ensureCapacity operation. This may reduce the amount of incremental reallocation.
<strong>Note that this implementation is not synchronized.</strong> If multiple threads access an ArrayList instance concurrently, and at least one of the threads modifies the list structurally, it must be synchronized externally. (A structural modification is any operation that adds or deletes one or more elements, or explicitly resizes the backing array; merely setting the value of an element is not a structural modification.) This is typically accomplished by synchronizing on some object that naturally encapsulates the list.
If no such object exists, the list should be "wrapped" using the Collections#synchronizedList Collections.synchronizedList method. This is best done at creation time, to prevent accidental unsynchronized access to the list:
List list = Collections.synchronizedList(new ArrayList(...));
<p id="fail-fast"> The iterators returned by this class's #iterator() iterator and #listIterator(int) listIterator methods are <em>fail-fast</em>: if the list is structurally modified at any time after the iterator is created, in any way except through the iterator's own ListIterator#remove() remove or ListIterator#add(Object) add methods, the iterator will throw a ConcurrentModificationException. Thus, in the face of concurrent modification, the iterator fails quickly and cleanly, rather than risking arbitrary, non-deterministic behavior at an undetermined time in the future.
Note that the fail-fast behavior of an iterator cannot be guaranteed as it is, generally speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent modification. Fail-fast iterators throw ConcurrentModificationException on a best-effort basis. Therefore, it would be wrong to write a program that depended on this exception for its correctness: the fail-fast behavior of iterators should be used only to detect bugs.
This class is a member of the Java Collections Framework.
Added in 1.2.
Java documentation for java.util.ArrayList.
Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.
Constructors
| ArrayList() |
Constructs an empty list with an initial capacity of ten. |
| ArrayList(ICollection) |
Constructs a list containing the elements of the specified collection, in the order they are returned by the collection's iterator. |
| ArrayList(Int32) |
Constructs an empty list with the specified initial capacity. |
| ArrayList(IntPtr, JniHandleOwnership) |
A constructor used when creating managed representations of JNI objects; called by the runtime. |
Properties
| Class |
Returns the runtime class of this |
| Handle |
The handle to the underlying Android instance. (Inherited from Object) |
| IsEmpty |
To be added (Inherited from AbstractCollection) |
| JniIdentityHashCode | (Inherited from Object) |
| JniPeerMembers | |
| ModCount |
The number of times this list has been structurally modified. (Inherited from AbstractList) |
| PeerReference | (Inherited from Object) |
| ThresholdClass |
This API supports the Mono for Android infrastructure and is not intended to be used directly from your code. |
| ThresholdType |
This API supports the Mono for Android infrastructure and is not intended to be used directly from your code. |
Methods
| Add(Int32, Object) |
To be added (Inherited from AbstractList) |
| Add(Object) |
To be added (Inherited from AbstractCollection) |
| AddAll(ICollection) |
To be added (Inherited from AbstractCollection) |
| AddAll(Int32, ICollection) |
To be added (Inherited from AbstractList) |
| Clear() |
To be added (Inherited from AbstractCollection) |
| Clone() |
Returns a shallow copy of this |
| Contains(Object) |
To be added (Inherited from AbstractCollection) |
| ContainsAll(ICollection) |
To be added (Inherited from AbstractCollection) |
| Dispose() | (Inherited from Object) |
| Dispose(Boolean) | (Inherited from Object) |
| EnsureCapacity(Int32) |
Increases the capacity of this |
| Equals(Object) |
Indicates whether some other object is "equal to" this one. (Inherited from Object) |
| ForEach(IConsumer) | |
| Get(Int32) |
Returns the element at the specified position in this list. |
| GetHashCode() |
Returns a hash code value for the object. (Inherited from Object) |
| IndexOf(Object) |
To be added (Inherited from AbstractList) |
| Iterator() |
Returns an iterator over the elements in this list in proper sequence. (Inherited from AbstractList) |
| JavaFinalize() |
Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. (Inherited from Object) |
| LastIndexOf(Object) |
To be added (Inherited from AbstractList) |
| ListIterator() |
To be added (Inherited from AbstractList) |
| ListIterator(Int32) |
To be added (Inherited from AbstractList) |
| Notify() |
Wakes up a single thread that is waiting on this object's monitor. (Inherited from Object) |
| NotifyAll() |
Wakes up all threads that are waiting on this object's monitor. (Inherited from Object) |
| Remove(Int32) |
To be added (Inherited from AbstractList) |
| Remove(Object) |
To be added (Inherited from AbstractCollection) |
| RemoveAll(ICollection) |
To be added (Inherited from AbstractCollection) |
| RemoveIf(IPredicate) | |
| RemoveRange(Int32, Int32) |
Removes from this list all of the elements whose index is between
|
| ReplaceAll(IUnaryOperator) | |
| RetainAll(ICollection) |
To be added (Inherited from AbstractCollection) |
| Set(Int32, Object) |
To be added (Inherited from AbstractList) |
| SetHandle(IntPtr, JniHandleOwnership) |
Sets the Handle property. (Inherited from Object) |
| Size() |
Returns the number of elements in this list. |
| Sort(IComparator) | |
| Spliterator() |
Creates a <em>late-binding</em>
and <em>fail-fast</em> |
| SubList(Int32, Int32) |
To be added (Inherited from AbstractList) |
| ToArray() |
To be added (Inherited from AbstractCollection) |
| ToArray(Object[]) |
To be added (Inherited from AbstractCollection) |
| ToArray<T>() | (Inherited from Object) |
| ToString() |
Returns a string representation of the object. (Inherited from Object) |
| TrimToSize() |
Trims the capacity of this |
| UnregisterFromRuntime() | (Inherited from Object) |
| Wait() |
Causes the current thread to wait until it is awakened, typically by being <em>notified</em> or <em>interrupted</em>. (Inherited from Object) |
| Wait(Int64, Int32) |
Causes the current thread to wait until it is awakened, typically by being <em>notified</em> or <em>interrupted</em>, or until a certain amount of real time has elapsed. (Inherited from Object) |
| Wait(Int64) |
Causes the current thread to wait until it is awakened, typically by being <em>notified</em> or <em>interrupted</em>, or until a certain amount of real time has elapsed. (Inherited from Object) |
Explicit Interface Implementations
| IJavaPeerable.Disposed() | (Inherited from Object) |
| IJavaPeerable.DisposeUnlessReferenced() | (Inherited from Object) |
| IJavaPeerable.Finalized() | (Inherited from Object) |
| IJavaPeerable.JniManagedPeerState | (Inherited from Object) |
| IJavaPeerable.SetJniIdentityHashCode(Int32) | (Inherited from Object) |
| IJavaPeerable.SetJniManagedPeerState(JniManagedPeerStates) | (Inherited from Object) |
| IJavaPeerable.SetPeerReference(JniObjectReference) | (Inherited from Object) |
Extension Methods
| JavaCast<TResult>(IJavaObject) |
Performs an Android runtime-checked type conversion. |
| JavaCast<TResult>(IJavaObject) | |
| GetJniTypeName(IJavaPeerable) | |
| ToEnumerable(IIterable) | |
| ToEnumerable<T>(IIterable) | |