multilevel inheritance

   public class Box{
    private double length;
    private double width;
    public Box(){
        System.out.println("box_default constructor");
        length=10;
        width=20;
    }
    public Box(double length,double width){
        System.out.println("box_parameterized constructor");
        this.length=length;
        this.width=width;
    }
    public String toString(){
        return "length:"+length+"\nwidth:"+width;
    }
   }

public class BoxColor extends Box{
    private String color;
    public Box color(){
        System.out.println("boxcolor-default constructor");
        color="brown";
    }
    public BoxColor(double length,double width,String color){
        super(length,width);
        this.color=color;
    }
}

public class BoxRating{
    private double rating;
public Box Rating(){}
    public BoxRating(double rating){this.rating=rating;}
    public BoxRating(double length,doublr width,String color,double rating)
    {
        super(length,width,color);
        this.rating=rating;
    }
    public String toString(){
        return super .toString()+"\n Rating"+rating;
    }
}

public class Main {
    public static void main(String[] args) {
        BoxRating b1=new BoxRating();
        System.out.println(b1);
        System.out.println();

        BoxRating b1=new BoxRating(5);
        System.out.println(b1);
        System.out.println();

        BoxRating b1=new BoxRating(20,30,"red",4.5);
        System.out.println(b1);
        System.out.println();
    }
}