//an example of an interface
//also shows how the interface could be "implemented" in a class.

import java.util.*;

public interface Inhabitable {
	
	public int MAXRESIDENTS = 20;
	
	//////////////////////////////////////////////
	//This method should return a Resident array
	public Resident[] getResidents();
	
	////////////////////////////////////////////////
	//this method shoudl take in a Resident and add it to the instance
	public void addResident(Resident r);
}

class Resident {
	//just a basic class to represent a Resident
	protected String name;
	
	public Resident(){
		//default constructor
		this("no name");
	}
	
	public Resident (String name){
		this.name = name;
	}
}

class Metropolis extends City implements Inhabitable {
	//A type of City
	private ArrayList<Resident> residents;
	
	public Metropolis(){
		//default constructor, creates the arrayList object
		//(remember this will have called the City Default constructor)
		//Assume City has a defined default constructor (add this to your City to test)
		residents = new ArrayList<Resident>();
	}
	
	public Resident[] getResidents(){
		//returns an array of the residents
		return this.residents.toArray(new Resident[this.residents.size()]);
	}
	
	public void addResident(Resident r){
		//adds a resident to the list
		residents.add(r);
	}
}