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Differentiate between an abstract class and an interface?

Ravi Vishwakarma 560 23 Aug 2021

 Differentiate between an abstract class and an interface?

c# c#javac++
Updated 23 Aug 2021
Ravi Vishwakarma
Ravi Vishwakarma

Software Developer

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. SWE @ MindStick | Software Engineer | Web Developer | .Net Developer | Web Developer | Backend Engineer | .NET Core Developer

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1 Answers

Ashutosh Kumar Verma
Ashutosh Kumar Verma 25 Aug 2021
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Difference  between Abstract class and Interface

There are some basic difference between abstract class and Interface

Abstract class                                                                        Interface

      

                              

                            

1- There are must be used 'abstract' keyword to define an abstract class.   Here 'interface' is used to define Interface before its name.
e.g abstract class <class_name>  e.g interface <interface_name>
2- An abstract class can contain abstract abstract methods and also regular methods.  In interface it can contain only methods
3- Abstract class is generally inherits in  derived class it is denoted with colon(:)  Interface is implement in regular class and  it also used ( : ) for implementation.
4- In abstract class there are not necessary  to call of all methods of abstract class except all defined abstract method .   In interface there is must to call all declared method in interface because all methods   are by default public and abstract.
5- Instance variable can be declare in abstract class.   It is not allow to declare instance in interface
6- In abstract class there is must use abstract keyword to declare a abstract method and also used 'override' keyword when it override in other regular class.     In interface methods are defined without using 'abstract' keyword and also does not  need to use 'override' keyword to override that methods in regular class.
exe- 
abstract class Animal  {                                              interface  InterfaceClass    {
        public abstract void Dog();                                    void Night(); // method without body
        public void Cat()  {                                             }
      Console.WriteLine('Cat cry like meuuuu');                           class Inte :InterfaceClass{
        }                                                                 public void Night(){
    }                                                                     Console.WriteLine('everyday '); //override
    class Flower : Animal  {                                               }
        public override void Dog()   {                                    }
            Console.WriteLine('Dog is bark');                                 class Interface    {
        }                                                                 static void Main(String[] arg)  {
    }                                                                      Inte inte =new Inte();
    class Abstract    {                                                     inte.Night();
        static void Main(string[] arg)   {                                  }
            Flower rose = new Flower();                                    }
            rose.Dog();                                                                          
            rose.Cat(); 
        }

    }

 note-  we can pass parameter in abstract method in Abstract class and Interface. In both abstract class and interface, methods are declare without his body. Its being terminate by semicolon (;). 

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