package socialNetwork;
import java.util.*;

public class Person {

	 final private String name ;
	 private ArrayList<Message> messages = new ArrayList<>();
	 private ArrayList<Person> followers = new ArrayList<>();
	 
	 Person (String name){
		 this.name=name;
	 }
	 
	 public void post (String title, String content) {
		 this.messages.add(new Message(this, title, content));
	 }
	 
//	 public int lastPost () {
//		 return this.messages.size();
//	 }
	 
	 public Message lastPost () {
		 if (this.messages.isEmpty()) {
			 System.out.println(this.name +" never sent a message");
			 return null;
		 }
		 else {
			 return this.messages.get(this.messages.size()-1);
		 }	 
	 }
	 
	 public void follow( Person toFollow) {
		toFollow.followers.add(this); 
		}
	 
	 public void likes (Message toLike){
		 toLike.getLikers().add(this);
	 }
	 
	 //othes functions
}





package socialNetwork;
import java.util.*;

public class Message {
	
	//properties
	private Person author;
	private String title;
	private String content;
	private ArrayList<Person> likers = new ArrayList<>();
	
	//contructors	
	
	Message(Person author, String title, String content, ArrayList<Person> likers){
		this.author = author;
		this.title = title;
		this.content = content;
		this.likers = likers;
	}
	
	Message(Person author, String title, String content){
		this(author, title, content, null);
	}
	
	
	//methods
	
	public ArrayList<Person> getLikers () {
		return likers;
	}
	
	public String getTitle(){
		return title;
	}
	
	public String getContent() {
		return content;
	}

	public void setTitle(String title) {
		this.title= title;
	}

	public void setContent(String content) {
		this.content=content;
	}
	
	//more methods
}




package socialNetwork;
import java.util.*;


public class Main {
	
	public final void main (String[] args) {
		People alice = new Person("Alice");
		People bob = new Person("Bob");
		People carl = new Person("Carl");
		
	}

}