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  1. using System;
  2. /*
  3.  ////interface////
  4.  * Interfaces are used to achieve multiple inheritance in C#.
  5.  * Similar to abstract classes, interfaces help us to achieve abstraction in C#.
  6.  * Interfaces provide loose coupling - having no or least effect on other parts of code 
  7.    when we change one part of a code.
  8.  */
  9. /*
  10.  * Abstract Class *
  11. *It contains both a declaration and implementation parts.
  12. *Multiple inheritance is not achieved by abstract class.
  13. *It contains a constructor.
  14. *It can contain static members.
  15. *It can contain different types of access modifiers like public, private, protected etc.
  16. *The performance of an abstract class is fast.
  17. *It can be fully, partially, or not implemented.
  18. •
  19.  * Interface *
  20. *It contains only the declaration of methods, properties, and events. Since C# 8,
  21.  default implementations can also be included.
  22. *Multiple inheritance is achieved by interface.
  23. *It does not contain a constructor.
  24. *It does not contain static members.
  25. *It only contains public access modifier because everything in the interface is public.
  26. *The performance of an interface is slow.
  27. *It should be fully implemented.
  28.  */
  29. public interface Drawable
  30. {
  31.     void draw();
  32.     void print();
  33. }
  34. public class Rectangle : Drawable
  35. {
  36.     public void draw()
  37.     {
  38.         Console.WriteLine("drawing rectangle...");
  39.     }
  40.     public void print()
  41.     {
  42.         Console.WriteLine("Rectangle class");
  43.     }
  44. }
  45. public class Circle : Rectangle ,Drawable
  46. {
  47.     public new void draw()
  48.     {
  49.         Console.WriteLine("drawing circle...");
  50.     }
  51. }
  52. public class TestInterface
  53. {
  54.     public static void Main()
  55.     {
  56.         Drawable d;
  57.         d = new Rectangle();
  58.         d.draw();
  59.         d = new Circle();
  60.         d.draw(); d.print();
  61.     }
  62. }
Success #stdin #stdout 0.05s 28668KB
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Standard input is empty
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drawing rectangle...
drawing circle...
Rectangle class
https://ideone.com/Dhvj1N
language:
C# (NET 6.0)
created:
237 days ago
visibility:
public

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