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An interface in the Java programming language is an abstract type that is used to declare a behavior that classes must implement. They are similar to protocols.Interfaces are declared using the interface keyword, and may only contain method signature and constant declarations (variable declarations that are declared to be both static and final).
In object-oriented programming, an interface or protocol type [a] is a data type that acts as an abstraction of a class. It describes a set of method signatures , the implementations of which may be provided by multiple classes that are otherwise not necessarily related to each other. [ 1 ]
By default, all methods in all classes are concrete, unless the abstract keyword is used. An abstract class may include abstract methods, which have no implementation. By default, all methods in all interfaces are abstract, unless the default keyword is used. The default keyword can be used to specify a concrete method in an interface.
Client interface: This is the public non-virtual interface; Subclass interface: This is the private interface, which can have any combination virtual and non-virtual methods. With such a structure, the fragile base class interface problem is mitigated. The only detriment is that the code is enlarged a little. [2]
A custom interface, anything derived from IUnknown, provides early bound access via a pointer to a virtual method table that contains a list of pointers to the functions that implement the functions declared in the interface, in the order they are declared. An in-process invocation overhead is, therefore, comparable to a C++ virtual method call.
Common Language Runtime, Common Type System, Global Assembly Cache, Microsoft Intermediate Language, Windows Forms; ADO.NET, ASP.NET; Windows Communication Foundation (WCF) Windows Presentation Foundation (WPF) Windows Workflow Foundation (WF) Windows CardSpace (WCS) Universal Windows Platform (UWP) Windows PowerShell; Microsoft Management ...
Windows UI Library (WinUI codenamed "Jupiter", [3] [4] and also known as UWP XAML and WinRT XAML) is a user interface API that is part of the Windows Runtime programming model that forms the backbone of Universal Windows Platform apps (formerly known as Metro-style or Immersive) for the Windows 8, Windows 8.1, Windows 10 and Windows Phone 8.1 operating systems.
An interface cannot. A class or abstract class can only inherit from one class or abstract class. A class or abstract class may implement one or more interfaces. An interface can only extend other interfaces. An abstract class may have non-public methods and properties (also abstract ones). An interface can only have public members.