Question

How to use simple interface in C#

Answer 1

using System;

namespace ConsoleApplication_C_Sharp
{
    interface MyInterface
    {
        void Print();

        int GetNumber(int number);
    }

    class MyClass : MyInterface
    {
        public void Print()
        {
            Console.WriteLine("MyClass : MyInterface Print()");
        }

        public int GetNumber(int number)
        {
            return number;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            MyInterface myinterface = new MyClass();

            myinterface.Print();

            Console.WriteLine(myinterface.GetNumber(300));
        }
    }
}


/*
run:
    
MyClass : MyInterface Print()
300

*/

 

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Answer 2

using System;

namespace ConsoleApplication_C_Sharp
{
    interface MyInterface
    {
        void Print();

        int GetNumber(int number);
    }

    class MyClass : MyInterface
    {
        public void Print()
        {
            Console.WriteLine("MyClass : MyInterface Print()");
        }

        public int GetNumber(int number)
        {
            return number;
        }
    }

    class MySubClass : MyClass, MyInterface
    {
        public new void Print()
        {
            Console.WriteLine("MySubClass : MyClass, MyInterface Print()");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            MyInterface myinterface = new MySubClass();

            myinterface.Print();

            Console.WriteLine(myinterface.GetNumber(300));
        }
    }
}


/*
run:
    
MySubClass : MyClass, MyInterface Print()
300

*/

 

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