Thread: Trouble using aggregate classes

Hey everyone, I'm pretty new with Java and am preparing for a class I'm taking later this summer. I've been doing a lot of self study and have been attempting to get as far as I can in some Java books by myself. Right now I'm working on a carpet calculator problem and I'm a bit stuck. I'm attempting to create a RoomDimension class to set the area of a room, then use a method from that class to establish an argument in a RoomCarpet class which calculates the total cost of of carpeting for the room.

public class RoomCarpet {
 
    private double carpetCost;
    private double roomSize;
    private RoomDimension yourSize;
 
    // This is what I'm having trouble with 
 
    public RoomCarpet(double cost, double roomsize){ // I'm not sure if I should use double or a RoomDimension object as the parameter
 
        carpetCost = cost;
        yourSize = new RoomDimension(); // I'm not sure what to pass as arguments here
        roomSize = yourSize.getArea();
 
    }
...

and here's the RoomDimension class:

public class RoomDimension {
 
    private double length;
    private double width;
 
    public RoomDimension(double len, double w){
 
        length = len;
        width = w;
 
    }
 
    public RoomDimension(RoomDimension object2){
 
        length = object2.length;
        width = object2.width;
 
    }
 
    public double getArea(){
 
        return length * width;
 
    }
 
    public String toString(){
 
        String str;
 
        str = "This rooms area is " + getArea();
 
        return str;
    }
 
}

I'd appreciate any help I can get. Thanks!

this is inheritance or not ?

No it's not inheritance. If anything, it's composition (or aggregation) hence the thread title.