IFunctionalInterface Interface

Reference

Definition

Namespace:: Java.Lang

Assembly:: Mono.Android.dll

Important

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An informative annotation type used to indicate that an interface type declaration is intended to be a functional interface as defined by the Java Language Specification.

[Android.Runtime.Register("java/lang/FunctionalInterface", "", "Java.Lang.IFunctionalInterfaceInvoker", ApiSince=24)]
public interface IFunctionalInterface : IDisposable, Java.Interop.IJavaPeerable, Java.Lang.Annotation.IAnnotation

[<Android.Runtime.Register("java/lang/FunctionalInterface", "", "Java.Lang.IFunctionalInterfaceInvoker", ApiSince=24)>]
type IFunctionalInterface = interface
    interface IAnnotation
    interface IJavaObject
    interface IDisposable
    interface IJavaPeerable

Attributes: RegisterAttribute

Implements: IJavaObject IJavaPeerable IAnnotation IDisposable

Remarks

An informative annotation type used to indicate that an interface type declaration is intended to be a functional interface as defined by the Java Language Specification.

Conceptually, a functional interface has exactly one abstract method. Since java.lang.reflect.Method#isDefault() default methods have an implementation, they are not abstract. If an interface declares an abstract method overriding one of the public methods of java.lang.Object, that also does <em>not</em> count toward the interface's abstract method count since any implementation of the interface will have an implementation from java.lang.Object or elsewhere.

Note that instances of functional interfaces can be created with lambda expressions, method references, or constructor references.

If a type is annotated with this annotation type, compilers are required to generate an error message unless:

<ul> <li> The type is an interface type and not an annotation type, enum, or class. <li> The annotated type satisfies the requirements of a functional interface. </ul>

However, the compiler will treat any interface meeting the definition of a functional interface as a functional interface regardless of whether or not a FunctionalInterface annotation is present on the interface declaration.

Added in 1.8.

Java documentation for java.lang.FunctionalInterface.

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.

Properties

Handle	Gets the JNI value of the underlying Android object. (Inherited from IJavaObject)
JniIdentityHashCode	Returns the value of `java.lang.System.identityHashCode()` for the wrapped instance. (Inherited from IJavaPeerable)
JniManagedPeerState	State of the managed peer. (Inherited from IJavaPeerable)
JniPeerMembers	Member access and invocation support. (Inherited from IJavaPeerable)
PeerReference	Returns a JniObjectReference of the wrapped Java object instance. (Inherited from IJavaPeerable)

Methods

AnnotationType()	Returns the annotation interface of this annotation. (Inherited from IAnnotation)
Disposed()	Called when the instance has been disposed. (Inherited from IJavaPeerable)
DisposeUnlessReferenced()	If there are no outstanding references to this instance, then calls `Dispose()`; otherwise, does nothing. (Inherited from IJavaPeerable)
Equals(Object)	Returns true if the specified object represents an annotation that is logically equivalent to this one. (Inherited from IAnnotation)
Finalized()	Called when the instance has been finalized. (Inherited from IJavaPeerable)
GetHashCode()	Returns the hash code of this annotation. (Inherited from IAnnotation)
SetJniIdentityHashCode(Int32)	Set the value returned by `JniIdentityHashCode`. (Inherited from IJavaPeerable)
SetJniManagedPeerState(JniManagedPeerStates)	(Inherited from IJavaPeerable)
SetPeerReference(JniObjectReference)	Set the value returned by `PeerReference`. (Inherited from IJavaPeerable)
ToString()	Returns a string representation of this annotation. (Inherited from IAnnotation)
UnregisterFromRuntime()	Unregister this instance so that the runtime will not return it from future Java.Interop.JniRuntime+JniValueManager.PeekValue invocations. (Inherited from IJavaPeerable)

Extension Methods

JavaCast<TResult>(IJavaObject)	Performs an Android runtime-checked type conversion.
JavaCast<TResult>(IJavaObject)
GetJniTypeName(IJavaPeerable)

Applies to

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