DIFFERENCE BETWEEN AN ABSTRACT CLASS AND AN INTERFACE

DIFFERENCE BETWEEN AN ABSTRACT CLASS AND AN INTERFACE

DIFFERENCE BETWEEN AN ABSTRACT CLASS AND AN INTERFACE: In C#, an Interface provides only those public services declared in the interfa... 13:05:00

DIFFERENCE BETWEEN AN ABSTRACT CLASS AND AN INTERFACE:

In C#, an Interface provides only those public services declared in the interface, whereas an abstract class provides the public services defined in an abstract

class and those members that are inherited from the abstract class's base class.

DIFFERENCE BETWEEN AN ABSTRACT CLASS AND AN INTERFACE:

1. An Abstract class doesn't provide full abstraction but an interface does provide full abstraction; i.e. both a declaration and a definition is given in an abstract class but not so in an interface.
2. Using Abstract we cannot achieve multiple inheritance but using an Interface we can achieve multiple inheritance.
3. We cannot declare a member field in an Interface.
4. We cannot use any access modifier i.e. public, private, protected, internal etc. because within an interface by default everything is public.
5. An Interface member cannot be defined using the keyword static, virtual, abstract or sealed.

     A) Abstract Class: We cannot create an object of an abstract class and can call the method of abstract class with the help of class name only.

using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication4 {    abstract class M1    {         public int add(int a, int b)         {             return (a + b);         }    }     class M2 :M1     {         public int mul(int a, int b)         {             return a * b;         }     }

class test  {         static void Main(string[] args)         {             M2 ob = new M2();             int result = ob.add(10, 20);             Console.WriteLine("the result is {0}", result);             Console.ReadLine();         }     } }

B) An Interface: The syntax of an Interface looks like this:

interface
{
     //Interface member
}

NOTE:

1. An Interface member cannot contain code bodies.
2. Type definition members are forbidden.
3. Properties are defined in an interface with the help of an access block get and set, which are permitted for the property.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication3
{
    interface MyInterface
    {
      void myMethod();
    }
    class MyClass : MyInterface
    {
      public static void Main()
      {
            MyClass cls = new MyClass();
            cls.myMethod();
      }
       public void myMethod()
      {
            Console.WriteLine("welcome to MCN IT SOLUTION");
            Console.ReadLine();
       }
    }
}