4.1 Composition, C#

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//4.1 Composition

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Inheritance is fine and at times is the best solution.
            //Composition is another way of extending type's functionality with another type.
            //Composition is having one type keeping reference to another
            var apple = new Apple();
            apple.Fruit.EatMe();
            Console.WriteLine(apple.Fruit.GetMyName());
            Console.WriteLine(apple.GetMyName());
        }
    }
    
    public class Fruit
    {
        public void EatMe()
        {
            Console.WriteLine("Eating...");
        }
        public string GetMyName()
        {
            return "Some fruit";
        }
    }
    public class Apple
    {
        public Fruit Fruit {get; set;}
        public Apple()
        {
            Fruit = new Fruit();
        }            
        public string GetMyName()
        {
            return "Apple";
        }
    }
}

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