TreeSet Class
Definition
Important
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A NavigableSet implementation based on a TreeMap.
[Android.Runtime.Register("java/util/TreeSet", DoNotGenerateAcw=true)]
[Java.Interop.JavaTypeParameters(new System.String[] { "E" })]
public class TreeSet : Java.Util.AbstractSet, IDisposable, Java.Interop.IJavaPeerable, Java.IO.ISerializable, Java.Lang.ICloneable, Java.Util.INavigableSet[<Android.Runtime.Register("java/util/TreeSet", DoNotGenerateAcw=true)>]
[<Java.Interop.JavaTypeParameters(new System.String[] { "E" })>]
type TreeSet = class
inherit AbstractSet
interface ISerializable
interface IJavaObject
interface IDisposable
interface IJavaPeerable
interface ICloneable
interface INavigableSet
interface ISortedSet
interface ISet
interface ICollection
interface IIterable- Inheritance
- Attributes
- Implements
Remarks
A NavigableSet implementation based on a TreeMap. The elements are ordered using their Comparable natural ordering, or by a Comparator provided at set creation time, depending on which constructor is used.
This implementation provides guaranteed log(n) time cost for the basic operations (add, remove and contains).
Note that the ordering maintained by a set (whether or not an explicit comparator is provided) must be consistent with equals if it is to correctly implement the Set interface. (See Comparable or Comparator for a precise definition of consistent with equals.) This is so because the Set interface is defined in terms of the equals operation, but a TreeSet instance performs all element comparisons using its compareTo (or compare) method, so two elements that are deemed equal by this method are, from the standpoint of the set, equal. The behavior of a set is well-defined even if its ordering is inconsistent with equals; it just fails to obey the general contract of the Set interface.
<strong>Note that this implementation is not synchronized.</strong> If multiple threads access a tree set concurrently, and at least one of the threads modifies the set, it must be synchronized externally. This is typically accomplished by synchronizing on some object that naturally encapsulates the set. If no such object exists, the set should be "wrapped" using the Collections#synchronizedSortedSet Collections.synchronizedSortedSet method. This is best done at creation time, to prevent accidental unsynchronized access to the set:
SortedSet s = Collections.synchronizedSortedSet(new TreeSet(...));
The iterators returned by this class's iterator method are fail-fast: if the set is modified at any time after the iterator is created, in any way except through the iterator's own remove method, 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.TreeSet.
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
| TreeSet() |
Constructs a new, empty tree set, sorted according to the natural ordering of its elements. |
| TreeSet(ICollection) |
Constructs a new tree set containing the elements in the specified collection, sorted according to the natural ordering of its elements. |
| TreeSet(IComparator) |
Constructs a new, empty tree set, sorted according to the specified comparator. |
| TreeSet(IntPtr, JniHandleOwnership) |
A constructor used when creating managed representations of JNI objects; called by the runtime. |
| TreeSet(ISortedSet) |
Constructs a new tree set containing the same elements and using the same ordering as the specified sorted set. |
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 | |
| 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(Object) |
To be added (Inherited from AbstractCollection) |
| AddAll(ICollection) |
To be added (Inherited from AbstractCollection) |
| Ceiling(Object) |
Added in 1. |
| Clear() |
To be added (Inherited from AbstractCollection) |
| Clone() |
Returns a shallow copy of this |
| Comparator() |
Returns the comparator used to compare elements in this |
| Contains(Object) |
To be added (Inherited from AbstractCollection) |
| ContainsAll(ICollection) |
To be added (Inherited from AbstractCollection) |
| DescendingIterator() |
Returns an iterator over the elements in this set in descending order. |
| DescendingSet() |
Returns a reverse order view of the elements contained in this set. |
| Dispose() | (Inherited from Object) |
| Dispose(Boolean) | (Inherited from Object) |
| Equals(Object) |
Indicates whether some other object is "equal to" this one. (Inherited from Object) |
| First() |
Returns the first element in this set. |
| Floor(Object) |
Added in 1. |
| GetHashCode() |
Returns a hash code value for the object. (Inherited from Object) |
| HeadSet(Object, Boolean) | |
| HeadSet(Object) | |
| Higher(Object) |
Added in 1. |
| Iterator() |
Returns an iterator over the elements in this set in ascending order. |
| 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) |
| Last() |
Returns the last element in this set. |
| Lower(Object) |
Added in 1. |
| 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) |
| PollFirst() |
Added in 1. |
| PollLast() |
Added in 1. |
| Remove(Object) |
To be added (Inherited from AbstractCollection) |
| RemoveAll(ICollection) |
To be added (Inherited from AbstractCollection) |
| RetainAll(ICollection) |
To be added (Inherited from AbstractCollection) |
| SetHandle(IntPtr, JniHandleOwnership) |
Sets the Handle property. (Inherited from Object) |
| Size() |
Returns the number of elements in this set (its cardinality). |
| Spliterator() |
Creates a <em>"Spliterator. |
| SubSet(Object, Boolean, Object, Boolean) | |
| SubSet(Object, Object) | |
| TailSet(Object, Boolean) | |
| TailSet(Object) | |
| 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) |
| 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) | |