Community discussion forum

Difference between class and interface

• • Reply

  3 years ago

  by anilrayal

  Anil Rayal

  Ahmedabad, India

  Joined 3 years ago

  Hi all

  I am bit of confused about interface.

  Please explain me what is an interface and how it differs from a class?

  thanks

  Regards

  Anil Rayal

  Report abuse
• • Reply

  3 years ago

  by brin351

  brin351

  , Australia

  Joined 4 years ago

  I'm no expert but in simple terms an Interface defines what an object can do a Class defines how it is done, so the two are seperated.

  Regards

  Brin

  Report abuse
• • Reply

  3 years ago

  by Edwin Vermeer

  Edwin Vermeer

  Wieringerwaard, The Netherlands, Netherlands

  Joined 7 years ago

  Hi,
  
  You can not create an instance of an interface, hou have to create an instance of an object that implements the interface. With an interface you just define what an object can/must be able to do. You will use Interfaces when you want to use various objects in the same way.
  
  
  Sample:
  Create an interface for a vehicle called IVehicle
  This interface will have the property Wheels.
  Create an object Car which implements the interface Ivehicle.
  Car.Wheels will alwais return 4
  2Create an object Bike with implements the interface Ivehicle.
  Bike.Wheels will alwais return 2
  What you can then do is:
  IVehicle vehicle = new Car();
  if you use vehicle.Wheels then it will return 4
  If you then do a:
  vehicle = new Bike();
  Now vehicle.Wheels will return 2.
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

  Report abuse
• • Reply

  3 years ago

  by anilrayal

  Anil Rayal

  Ahmedabad, India

  Joined 3 years ago

  hi friends

  Thanks a lot for reply..

  Report abuse
• • Reply

  5 months ago

  by Guarantee Hosting

  99.9% Uptime Guarantee Hosting

  Ahmadabad, India

  Joined 5 months ago

  In general, interfaces are used only in languages that use the single-inheritance class model. In these single-inheritance languages, interfaces are typically used if any class could use a particular method or set of methods. Also in these single-inheritance languages, abstract classes are used to either have defined class variables in addition to none or more methods, or to exploit the single-inheritance model to limit the range of classes that could use a set of methods.

  Languages that support the multiple-inheritance model tend to use only classes or abstract base classes and not interfaces. Since Python supports multiple inheritance, it does not use interfaces and you would want to use base classes or abstract base classes http://www.marblehost.com/uptime-guarantee.php Link Text

  Report abuse