interview

Home / DeveloperSection / Interviews / What is an interface class? Explain with example.

What is an interface class? Explain with example.

Ravi Vishwakarma 540 29-Nov-2021

c# .net

Ravi Vishwakarma

Ravi Vishwakarma

Follow

Hi, my self Ravi Vishwakarma. I have completed my studies at SPICBB Varanasi. now I completed MCA with 76% form Veer Bahadur Singh Purvanchal University Jaunpur.

Can you answer this question?

2 Answers

02-Sep-2022

An interface is a reference type in Java. It is similar to class. It is a collection of abstract methods. A class implements an interface, thereby inheriting the abstract methods of the interface.

Along with abstract methods, an interface may also contain constants, default methods, static methods, and nested types. Method bodies exist only for default methods and static methods.

Writing an interface is similar to writing a class. But a class describes the attributes and behaviors of an object. And an interface contains behaviors that a class implements.

Unless the class that implements the interface is abstract, all the methods of the interface need to be defined in the class.

An interface is similar to a class in the following ways −

An interface can contain any number of methods.
An interface is written in a file with a .java extension, with the name of the interface matching the name of the file.
The byte code of an interface appears in a .class file.
Interfaces appear in packages, and their corresponding bytecode file must be in a directory structure that matches the package name.

Ravi Vishwakarma

29-Nov-2021

An Interface is an abstract class which has only public abstract methods, and the methods only have the declaration and not the definition. These abstract methods must be implemented in the inherited classes.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Hello
{
 interface IListOfTuto // interface
 {
  void SetTutorial(int pID, string pName);
  String GetTutorial();
 }
 class HelloWorld : IListOfTuto  // class 
 {
  protected int TutorialID;
  protected string TutorialName;
  public void SetTutorial(int pID, string pName)
  {
   TutorialID = pID;
   TutorialName = pName;
  }
  public String GetTutorial()
  {
   return TutorialName;
  }
  static void Main(string[] args)
  {
   HelloWorld pTutor = new HelloWorld();
   pTutor.SetTutorial(1,".Net by mindstick.com");
   Console.WriteLine(pTutor.GetTutorial());
   Console.ReadKey();
  }
 }
}