Question

I have this class

public class Room{

private int n_bed;
private float cost;

private Collection<Client> clientlist;

public Room(int n,float c){

    n_bed = n;
    cost = c;

    clientlist = new ArrayList<Client>();
}

}

and this class inherited from the above class

public class RoomWithBar extends Room{

private Collection<Drink> drinkslist;

public RoomWithBar(int n,float cost){

    super(n,cost);

    drinkslist = new ArrayList<Drink>();
}

public Collection<Drink> getDrinksList(){

    return drinkslist;
}

public void addDrink(Drink drink){

    drinkslist.add(drink)
}

}

my question is: I have to insert also the collection clientlist in the class RoomWithBar or the collection automatically is inherited?

Answer 1

Thats what protected modifier does.

protected Collection<Client> clientlist;

Now, clientlist will be accessible in derived classes.

For details click here.