using System;

using System.Collections.Generic;

public interface IPost{

    void setContent(String content);

    void setTitle(String title);

    void setUser(IUser user);   

    String getContent();

    String getTitle();

    IUser getUser();    

}

​

public interface IUser {

    void setName(String name);  

    String getName();   

}

​

public class Post {

    private String content;

    private String title;

}

​

public class User {

    private String name;

    public User (String name){

        this.name = name;

    }

}

​

​

​

public class SocialNetwork {

    private List<IPost> posts;

    public SocialNetwork(){

        posts = new List<IPost>();

    }

    public void post(IPost post){

        posts.Add(post);

    }

    public void showPosts(){

        foreach(IPost post in posts){

            Console.WriteLine("POST");

            Console.WriteLine("Title: {0}",post.getTitle());

            Console.WriteLine("User: {0}",post.getUser().getName());

            Console.WriteLine("Content: {0}{1}",Environment.NewLine,post.getContent());

        }

    }

}

​

​

​

public class Program

{

    public static void Main()

    {

        SocialNetwork socialNetwork = new SocialNetwork();

        User ricardo = new User("Ricardo");

        Post post1 = new Post(ricardo, "Bom fim-de-semama","Espero que todos tenham um optimo fim-de-semana");

        socialNetwork.post(post1);

        socialNetwork.showPosts();

    }

}