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A class having code and data for all the methods corresponding to that interface and declaring so is said to implement that interface. [9] Furthermore, even in single-inheritance-languages, one can implement multiple interfaces, and hence can be of different types at the same time.
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 ]
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).
Classes may inherit from other classes, so they are arranged in a hierarchy that represents "is-a-type-of" relationships. For example, class Employee might inherit from class Person. All the data and methods available to the parent class also appear in the child class with the same names.
A class defines an implementation of an interface, and instantiating the class results in an object that exposes the implementation via the interface. [3] In the terms of type theory, a class is an implementation—a concrete data structure and collection of subroutines—while a type is an interface .
Convert the interface of a class into another interface clients expect. An adapter lets classes work together that could not otherwise because of incompatible interfaces. The enterprise integration pattern equivalent is the translator. Yes Yes Yes Bridge: Decouple an abstraction from its implementation allowing the two to vary independently ...
The classes are then refined and re-structured or reorganized as needed for the design, for example: Factoring out common behaviors in different use-case controls; Identifying a central boundary class for each kind of human actor and for each external system that would provide a consistent interface to the outside world.
C# also has explicit interface implementation that allows a class to specifically implement methods of an interface, separate to its own class methods, or to provide different implementations for two methods with the same name and signature inherited from two base interfaces.