CONSTRUCTOR CHALLENGE

MY APPROACH(BUGS)

public class Floor {
    private double length;
    private double width;

    public double getLength(){
        if(length<0)return 0;
        else return length;
    }
    public double getWidth(){
        if(width<0)return 0;
        else return width;
    }
    public void setLength(double length){
        this.length = length;
    }
    public void setWidth(double width){
        this.width = width;
    }
    public double getArea(){
         return (length * width);
    }
public class Carpet {
    private double cost;

    public double getCost(){
        if(cost<0)return 0;
        else return cost;
    }
    public void setCost(double cost){
        this.cost = cost;
    }
}

public class Calculator {
    private Floor floor;
    private Carpet carpet;

    public void setTotalCost(){
        this.floor=floor;
        this.carpet=carpet;
    }
    public double getTotalCost() {
        return (floor.getArea() * carpet.getCost());
    }
}

} 

BEST APPROACH

public class Floor {
    private double width;
    private double length;

    public Floor(double width,double length){
        if(width<0) this.width = 0;
        else this.width = width;

        if(length<0) this.length = 0;
        else this.length = length;
    }
    public double getArea(){
        return (this.width*this.length);
    }
    public class Carpet {
        private double cost;

        public Carpet(double cost){
            this.cost=(cost<0) ? 0 : cost;
        }
        public double getCost(){
            return cost;
        }
    }
    

    public class Calculator {
        private Floor floor;
        private Carpet carpet;

        public Calculator(Floor floor,Carpet carpet){
            this.floor = floor;
            this.carpet = carpet;
        }

        public double getTotalCost(){
            return (floor.getArea() * carpet.getCost());
        }

    }
}