Doubt In Interface ?

Question

Hello Friends, Doubt in Interface: 1. How do we use Interface in real time scenario. 2. How to assign Interface for a given Class? 3. How to inherit two Interface in a class? 4. Why do we use interface instead of creating object for a class and using in another class? Thanks In Advance :)

Munesh Sharma · Answer

Hi Survan, Firstly i will tell you why we use interface. (1):- Interface allows us to develop loosely coupled system. (2) :- Interface are very useful for dependency Injection. (3) :- Interface makes unit testing & mocking easier. interface can't have implementation for any of its method.There is no access modifiers. declaring Interface Public interface interfacename // interface members int id; char Id; How to inherit two Interface in a class public interface ITest { void Test (); } public interface ITest2 { void Test (); } public class Dual : ITest , ITest2 { void ITest . Test () { Console . WriteLine ( "ITest.Test" ); } void ITest2 . Test () { Console . WriteLine ( "ITest2.Test" ); } }

Abhishek Kumar · Answer

Hi, 1. How do we use Interface in real time scenario. Interface is used basically where we don't want our client to know about the changes proposed. Interface creates a layer where you can add new functionality without doing much code change in client. 2.How to assign Interface for a given Class? below is the interface which is returning the brand name and accepting car id as a parameter. Interface Icar { string GetCarDetail(int Carid) } Interface IBike { string GetBikeDetail(int Carid) } Implementation public class car :Icar { } 3. How to inherit two Interface in a class? Public Class Vehicle :Icar,IBike { } 4. Why do we use interface instead of creating object for a class and using in another class? Abstraction can be achieved by doing this. Thanks

saurabh mittal · Answer

Hi Suren 1. we can useinterface like this:- interface IOurDevices { void connectToDevice(); } 2.to assign interface to class just inherit interface class and define the method:- class USBDevice : IOurDevices { void connectToDevice() { connectionState = "connected"; }} 3.class USBDevice : IOurDevices,GenericDevice { //define ur methods } 4.for security reasons we use interface beacause we can't create an object of interface so there is no communication at runtime.

Jaganathan Bantheswaran · Answer

Hi, 1. How do we use Interface in real time scenario. 2. How to assign Interface for a given Class? Answer for both the question is Here , the real time usage of interface in Log4Net . 3. How to inherit two Interface in a class? You can do like, public class C : A, B // A & B are interfaces here 4. Why do we use interface instead of creating object for a class and using in another class? As mentioned in the answer 1 & 2, interface is just a contract which should be implemented in the Class which is to be initiated.