Given the Solid class, extend it with: Pyramid
Cylinder
RectangularPrism
Sphere
Make sure to create the constructor and override the volume and surfaceArea methods.
Also extend RectangularPrism with Cube.
HINT: You can look up formulas for how to compute the volume and surface area of a certain type of shape online.
import java. lang. Math;
public class Pyramid extends Solid
{
// Code goes here
}
public class Cube extends RectangularPrism
{

// Code goes here
}
public class RectangularPrism extends Solid
{
// Code goes here
}
public class Solid
{
private String myName;
public Solid(String name)
{
myName = name;
}
public String getName()
{
return myName;
}
// This should be overriden in the subclass
public double volume()
{
return 0;
}
// This should be overriden in the subclass
public double surfaceArea()
{
return 0;
}
}
import java. lang. Math;
public class Sphere extends Solid
{
// Code goes here
}
import java. lang. Math;
public class Cylinder extends Solid
{

// Code goes here
}
public class SolidTester
{
public static void main(String[] args)
{
String name;
double volume;
double surfaceArea;
Pyramid pyramid = new Pyramid("My pyramid", 1, 3, 5);
name = pyramid. getName();
volume = round(pyramid. volume(), 2);
surfaceArea = round(pyramid. surfaceArea(), 2);
System. out. println("Pyramid '" + name + "' has volume: " + volume +
" and surface area: " + surfaceArea + ".");
Sphere sphere = new Sphere("My sphere", 4);
name = sphere. getName();
volume = round(sphere. volume(), 2);
surfaceArea = round(sphere. surfaceArea(), 2);
System. out. println("Sphere '" + name + "' has volume: " + volume +
" and surface area: " + surfaceArea + ".");
RectangularPrism rectangularPrism = new RectangularPrism("My rectangular prism",
5, 8, 3);
name = rectangularPrism. getName();
volume = round(rectangularPrism. volume(), 2);
surfaceArea = round(rectangularPrism. surfaceArea(), 2);
System. out. println("RectangularPrism '" + name + "' has volume: " +
volume + " and surface area: " + surfaceArea + ".");
Cylinder cylinder = new Cylinder("My cylinder", 4, 9);
name = cylinder. getName();
volume = round(cylinder. volume(), 2);
surfaceArea = round(cylinder. surfaceArea(), 2);
System. out. println("Cylinder '" + name + "' has volume: " + volume +
" and surface area: " + surfaceArea + ".");
Cube cube = new Cube("My cube", 4);
name = cube. getName();
volume = round(cube. volume(), 2);
surfaceArea = round(cube. surfaceArea(), 2);
System. out. println("Cube '" + name + "' has volume: " + volume +
" and surface area: " + surfaceArea + ".");
}
public static double round(double value, int places) {
if (places < 0) throw new IllegalArgumentException();
long factor = (long) Math. pow(10, places);
value = value * factor;
long tmp = Math. round(value);
return (double) tmp / factor;
}
}

Following are the code to this question:

Explanation:

//For Solid:

public class Solid//defining a class Solid

{

private String myName;//defining a String variable

public Solid(String name)//defining parameterized constructor

{

myName = name;//holding String value in myName variable

}

public String getName()//defining getName method  

{

return myName;//return value of myName

}

public double volume()//defining method volume that overriden its subclass

{

return 0;//return value

}

public double surfaceArea()//defining method surfaceArea that overriden its subclass

{

return 0;//return value

}

}

//For RectangularPrism:

public class RectangularPrism extends Solid//defining a class RectangularPrism that inherits Solid

{

  protected double length,width,height;//defining double variable

RectangularPrism(String str,double l,double w,double h)//defining parameterized constructor

{

  super(str);//use super method

  this.length=l;//use this to hold value

  this.width=w;//use this to hold value

  this.height=h;//use this to hold value

}

public double volume()//defining volume method  

{

return length*width*height;//calculate and return volume value

}

public double surfaceArea()//defining a  method surfaceArea  

{

return 2*(length*width+width*height+height*length);//calculate and return the surfaceArea

}

}

// For  Cube:

public class Cube extends RectangularPrism//defining Cube class that inherits RectangularPrism  

{

  Cube(String name, double side) //defining parameterized constructor

   {

       super(name, side, side, side);//use super method

   }

  public double volume()//defining volume method  

  {

   return length * length * length;//calculate and return volume

  }

public double surfaceArea()//defining method surfaceArea  

  {

  return 6 * length*length;//calculate and return surfaceArea

   }

}

//for Cylinder:

import java.lang.*;//import lang package  

public class Cylinder extends Solid//defining Cylinder class that inherits Solid

{

  private double radius, height;//defining double variable

  public Cylinder(String str, double r, double h)//defining parameterized constructor

  {

      super(str);//use super Method

      this.radius = r;//use this keyword to hold value

      this.height = h;//use this keyword to hold value

  }

  public double volume()//defining volume method

  {

      return Math.PI * radius * radius * height;//calculate and return volume

  }

  public double surfaceArea()//defining surfaceArea method

  {

     return 2 * Math.PI * radius * (height + radius);//calculate and return surfaceArea

  }

}

//For Pyramid

import java.lang.*;//import package

public class Pyramid extends Solid//defining a Pyramid class that inherits Solid

{  

  private double length, width,height;//defining double variable

  public Pyramid(String str, double l, double w, double h)//defining parameterized constructor  

  {

      super(str);//use super method

      this.length = l;//use this keyword to hold value

      this.width = w;//use this keyword to hold value

      this.height = h;//use this keyword to hold value

  }

public double volume()//defining volume method

{

return (length*width*height)/3.0;//calculate and return volume

}

public double surfaceArea()//defining a method surfaceArea

{

return (length*width)+length*Math.sqrt((Math.pow((width/2),2)+(height*height)))+(width*Math.sqrt((Math.pow((length/2),2)+(height*height))));//calculate and return surfaceArea

}

}

//For Sphere

import java.lang.*;//import package

public class Sphere extends Solid //defining Sphere class that inherits Solid

{

  private double radius;//defining double variable

  public Sphere(String str, double r)//defining parameterized constructor  

  {

      super(str);//use super method

      this.radius = r;//use this to hold value

  }

  public double volume()//defining volume method

  {

      return (4.0/3.0)*Math.PI*radius*radius*radius;//calculate and return volume

  }

  public double surfaceArea()//defining method surfaceArea  

  {

    return 4 * Math.PI * radius * radius;//calculate and return surfaceArea

  }

}

please find attachment.

so much for the extra points :