Simple Inheritance, Multilevel inheritance and Hierarchical inheritance in java

Q) Simple Inheritance

Explain  the  above  using  GeometricShape  Class with    attributes    borderColor(String),    filled (Boolean  type).  This  is  inherited  by  Rectangle Class  with  length  and  width  as  attributes.  Add mutators, accessors and toString() methods

Multilevel Inheritance
Enhance the above design where Cuboid class with height field inherits the Rectangle class.

Hierarchy Inheritance
Enhance the design of Simple Inheritance where Circle class with radius field also inherits from GeometricShape. 

class GeometricShapeClass
{
    private String bColor;
    private boolean filled;
    public GeometricShapeClass(String c, boolean f)
    {
        bColor=c;
        filled=f;
    }
    public String toString()
    {
        return " Border color = "+bColor+" filled = "+filled;
    }
}
class Rectangle extends GeometricShapeClass
{
    double l,w;
    public Rectangle(String c, boolean f,double le, double wi)
    {
        super(c,f);
        l=le;
        w=wi;
    }
     public String toString()
    {
        return super.toString()+ " length = " +l+ " width = " + w;
    }
   
}
class Cuboid extends Rectangle
{
    double h;
    public Cuboid(String c, boolean f,double le, double wi, double he)
    {
        super(c,f,le,wi);
        h=he;
    }
     public String toString()
    {
        return super.toString()+" height = "+h;
    }
}
class Circle extends GeometricShapeClass
{
    double radius;
    public Circle(String c, boolean f, double r)
    {
        super(c,f);
        radius=r;
    }
    public String toString()
    {
        return super.toString()+ " radius = "+radius;
    }
}
public class Demo
{
    public static void main(String args[])
    {
     Cuboid ob1 = new Cuboid("black",true,10,30,60);
     System.out.println(ob1);
     Circle ob2 = new Circle("red",false,20.5);
     System.out.println(ob2);
    }
}