ConcurrentHashMap ConcurrentHashMap Class


A hash table supporting full concurrency of retrievals and high expected concurrency for updates.

[Android.Runtime.Register("java/util/concurrent/ConcurrentHashMap", ApiSince=1, DoNotGenerateAcw=true)]
[Java.Interop.JavaTypeParameters(new System.String[] { "K", "V" })]
public class ConcurrentHashMap : Java.Util.AbstractMap, IDisposable, Java.IO.ISerializable, Java.Util.Concurrent.IConcurrentMap
type ConcurrentHashMap = class
    inherit AbstractMap
    interface ISerializable
    interface IJavaObject
    interface IDisposable
    interface IConcurrentMap
    interface IMap


Android platform documentation

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.


ConcurrentHashMap() ConcurrentHashMap()

Creates a new, empty map with the default initial table size (16).

ConcurrentHashMap(IDictionary) ConcurrentHashMap(IDictionary)
ConcurrentHashMap(Int32) ConcurrentHashMap(Int32)

Creates a new, empty map with an initial table size accommodating the specified number of elements without the need to dynamically resize.

ConcurrentHashMap(Int32, Single) ConcurrentHashMap(Int32, Single)

Creates a new, empty map with an initial table size based on the given number of elements (initialCapacity) and initial table density (loadFactor).

ConcurrentHashMap(Int32, Single, Int32) ConcurrentHashMap(Int32, Single, Int32)
ConcurrentHashMap(IntPtr, JniHandleOwnership) ConcurrentHashMap(IntPtr, JniHandleOwnership)

A constructor used when creating managed representations of JNI objects; called by the runtime.


Class Class

Returns the unique instance of Class that represents this object's class.

(Inherited from Object)
Handle Handle

The handle to the underlying Android instance.

(Inherited from Object)
IJavaObjectEx.IsProxy IJavaObjectEx.IsProxy Inherited from Object
IJavaObjectEx.KeyHandle IJavaObjectEx.KeyHandle Inherited from Object
IJavaObjectEx.NeedsActivation IJavaObjectEx.NeedsActivation Inherited from Object
IJavaPeerable.JniManagedPeerState IJavaPeerable.JniManagedPeerState Inherited from Object
IsEmpty IsEmpty

Returns whether this map is empty.

(Inherited from AbstractMap)
JniIdentityHashCode JniIdentityHashCode Inherited from Object
JniPeerMembers JniPeerMembers
PeerReference PeerReference Inherited from Object
ThresholdClass ThresholdClass

This API supports the Mono for Android infrastructure and is not intended to be used directly from your code.

ThresholdType ThresholdType

This API supports the Mono for Android infrastructure and is not intended to be used directly from your code.


Clear() Clear()

Removes all elements from this Map, leaving it empty.

(Inherited from AbstractMap)
Clone() Clone()

Creates and returns a copy of this Object.

(Inherited from Object)
Compute(Object, IBiFunction) Compute(Object, IBiFunction)
ComputeIfAbsent(Object, IFunction) ComputeIfAbsent(Object, IFunction)
ComputeIfPresent(Object, IBiFunction) ComputeIfPresent(Object, IBiFunction)
Contains(Object) Contains(Object)

Legacy method testing if some key maps into the specified value in this table.

ContainsKey(Object) ContainsKey(Object)

Returns whether this Map contains the specified key.

(Inherited from AbstractMap)
ContainsValue(Object) ContainsValue(Object)

Returns whether this Map contains the specified value.

(Inherited from AbstractMap)
Dispose() Dispose() Inherited from Object
Dispose(Boolean) Dispose(Boolean) Inherited from Object
Elements() Elements()

Returns an enumeration of the values in this table.

EntrySet() EntrySet()

Returns a ISet view of the mappings contained in this map.

Equals(Object) Equals(Object)

Compares this instance with the specified object and indicates if they are equal.

(Inherited from Object)
ForEach(IBiConsumer) ForEach(IBiConsumer)
ForEach(Int64, IBiConsumer) ForEach(Int64, IBiConsumer)
ForEach(Int64, IBiFunction, IConsumer) ForEach(Int64, IBiFunction, IConsumer)
ForEachEntry(Int64, IConsumer) ForEachEntry(Int64, IConsumer)
ForEachEntry(Int64, IFunction, IConsumer) ForEachEntry(Int64, IFunction, IConsumer)
ForEachKey(Int64, IConsumer) ForEachKey(Int64, IConsumer)
ForEachKey(Int64, IFunction, IConsumer) ForEachKey(Int64, IFunction, IConsumer)
ForEachValue(Int64, IConsumer) ForEachValue(Int64, IConsumer)
ForEachValue(Int64, IFunction, IConsumer) ForEachValue(Int64, IFunction, IConsumer)
Get(Object) Get(Object)

Returns the value of the mapping with the specified key.

(Inherited from AbstractMap)
GetHashCode() GetHashCode()

Returns an integer hash code for this object.

(Inherited from Object)
GetOrDefault(Object, Object) GetOrDefault(Object, Object)
JavaFinalize() JavaFinalize()

Invoked when the garbage collector has detected that this instance is no longer reachable.

(Inherited from Object)
Keys() Keys()

Returns an enumeration of the keys in this table.

KeySet() KeySet()

Returns a set of the keys contained in this Map.

(Inherited from AbstractMap)
MappingCount() MappingCount()
Merge(Object, Object, IBiFunction) Merge(Object, Object, IBiFunction)
Notify() Notify()

Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.

(Inherited from Object)
NotifyAll() NotifyAll()

Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.

(Inherited from Object)
Put(Object, Object) Put(Object, Object) Inherited from AbstractMap
PutAll(IDictionary) PutAll(IDictionary) Inherited from AbstractMap
PutIfAbsent(Object, Object) PutIfAbsent(Object, Object)
Reduce(Int64, IBiFunction, IBiFunction) Reduce(Int64, IBiFunction, IBiFunction)
ReduceEntries(Int64, IBiFunction) ReduceEntries(Int64, IBiFunction)
ReduceEntries(Int64, IFunction, IBiFunction) ReduceEntries(Int64, IFunction, IBiFunction)
ReduceEntriesToDouble(Int64, IToDoubleFunction, Double, IDoubleBinaryOperator) ReduceEntriesToDouble(Int64, IToDoubleFunction, Double, IDoubleBinaryOperator)
ReduceEntriesToInt(Int64, IToIntFunction, Int32, IIntBinaryOperator) ReduceEntriesToInt(Int64, IToIntFunction, Int32, IIntBinaryOperator)
ReduceEntriesToLong(Int64, IToLongFunction, Int64, ILongBinaryOperator) ReduceEntriesToLong(Int64, IToLongFunction, Int64, ILongBinaryOperator)
ReduceKeys(Int64, IBiFunction) ReduceKeys(Int64, IBiFunction)
ReduceKeys(Int64, IFunction, IBiFunction) ReduceKeys(Int64, IFunction, IBiFunction)
ReduceKeysToDouble(Int64, IToDoubleFunction, Double, IDoubleBinaryOperator) ReduceKeysToDouble(Int64, IToDoubleFunction, Double, IDoubleBinaryOperator)
ReduceKeysToInt(Int64, IToIntFunction, Int32, IIntBinaryOperator) ReduceKeysToInt(Int64, IToIntFunction, Int32, IIntBinaryOperator)
ReduceKeysToLong(Int64, IToLongFunction, Int64, ILongBinaryOperator) ReduceKeysToLong(Int64, IToLongFunction, Int64, ILongBinaryOperator)
ReduceToDouble(Int64, IToDoubleBiFunction, Double, IDoubleBinaryOperator) ReduceToDouble(Int64, IToDoubleBiFunction, Double, IDoubleBinaryOperator)
ReduceToInt(Int64, IToIntBiFunction, Int32, IIntBinaryOperator) ReduceToInt(Int64, IToIntBiFunction, Int32, IIntBinaryOperator)
ReduceToLong(Int64, IToLongBiFunction, Int64, ILongBinaryOperator) ReduceToLong(Int64, IToLongBiFunction, Int64, ILongBinaryOperator)
ReduceValues(Int64, IBiFunction) ReduceValues(Int64, IBiFunction)
ReduceValues(Int64, IFunction, IBiFunction) ReduceValues(Int64, IFunction, IBiFunction)
ReduceValuesToDouble(Int64, IToDoubleFunction, Double, IDoubleBinaryOperator) ReduceValuesToDouble(Int64, IToDoubleFunction, Double, IDoubleBinaryOperator)
ReduceValuesToInt(Int64, IToIntFunction, Int32, IIntBinaryOperator) ReduceValuesToInt(Int64, IToIntFunction, Int32, IIntBinaryOperator)
ReduceValuesToLong(Int64, IToLongFunction, Int64, ILongBinaryOperator) ReduceValuesToLong(Int64, IToLongFunction, Int64, ILongBinaryOperator)
Remove(Object) Remove(Object)

Removes a mapping with the specified key from this Map.

(Inherited from AbstractMap)
Remove(Object, Object) Remove(Object, Object)

Removes the entry for a key only if currently mapped to a given value.

Replace(Object, Object) Replace(Object, Object)
Replace(Object, Object, Object) Replace(Object, Object, Object)
ReplaceAll(IBiFunction) ReplaceAll(IBiFunction)
Search(Int64, IBiFunction) Search(Int64, IBiFunction)
SearchEntries(Int64, IFunction) SearchEntries(Int64, IFunction)
SearchKeys(Int64, IFunction) SearchKeys(Int64, IFunction)
SearchValues(Int64, IFunction) SearchValues(Int64, IFunction)
SetHandle(IntPtr, JniHandleOwnership) SetHandle(IntPtr, JniHandleOwnership)

Sets the Handle property.

(Inherited from Object)
Size() Size()

Returns the number of mappings in this Map.

(Inherited from AbstractMap)
ToArray<T>() ToArray<T>() Inherited from Object
ToString() ToString()

Returns a string containing a concise, human-readable description of this object.

(Inherited from Object)
UnregisterFromRuntime() UnregisterFromRuntime() Inherited from Object
Values() Values()

Returns a Collection of the values contained in this Map.

(Inherited from AbstractMap)
Wait() Wait()

Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

(Inherited from Object)
Wait(Int64) Wait(Int64)

Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.

(Inherited from Object)
Wait(Int64, Int32) Wait(Int64, Int32)

Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.

(Inherited from Object)

Explicit Interface Implementations

IJavaObjectEx.ToLocalJniHandle() IJavaObjectEx.ToLocalJniHandle() Inherited from Object
IJavaPeerable.Disposed() IJavaPeerable.Disposed() Inherited from Object
IJavaPeerable.DisposeUnlessReferenced() IJavaPeerable.DisposeUnlessReferenced() Inherited from Object
IJavaPeerable.Finalized() IJavaPeerable.Finalized() Inherited from Object
IJavaPeerable.SetJniIdentityHashCode(Int32) IJavaPeerable.SetJniIdentityHashCode(Int32) Inherited from Object
IJavaPeerable.SetJniManagedPeerState(JniManagedPeerStates) IJavaPeerable.SetJniManagedPeerState(JniManagedPeerStates) Inherited from Object
IJavaPeerable.SetPeerReference(JniObjectReference) IJavaPeerable.SetPeerReference(JniObjectReference) Inherited from Object

Extension Methods

JavaCast<TResult>(IJavaObject) JavaCast<TResult>(IJavaObject)

Performs an Android runtime-checked type conversion.

JavaCast<TResult>(IJavaObject) JavaCast<TResult>(IJavaObject)
GetJniTypeName(IJavaPeerable) GetJniTypeName(IJavaPeerable)

Applies to