An object oriented version of Geometry.java that will compute the volume and surface area of a sphere with radius r, a cylinder with circular base with radius r and height h, and a cone with circular base with radius r and height h. Written in Java.

Cone.java

//Cone.java - Jimmy Kurian

public class Cone
{
   private double r;
   private double h;

   public Cone(double aRadius, double aHeight)
   {
      r = aRadius;
      h = aHeight;
   }

   public double getVolume()
   {
      return (1.0 / 3.0) * Math.PI * r * r * h;
   }

   public double getSurfaceArea()
   {
      return Math.PI * r * (h + r);
   }
}

Cylinder.java

//Cylinder.java - Jimmy Kurian

public class Cylinder
{
   private double r;
   private double h;

   public Cylinder(double aRadius, double aHeight)
   {
      r = aRadius;
      h = aHeight;
   }

   public double getVolume()
   {
      return h * Math.PI * r * r;
   }

   public double getSurfaceArea()
   {
      return (2.0 * r * Math.PI * h) + (2.0 * Math.PI * r * r);
   }
}

GeometryTester2.java

//GeometryTester2.java - Jimmy Kurian

import java.util.Scanner;

public class GeometryTester2
{
   public static void main(String[] args)
   {
      Scanner in = new Scanner(System.in);

      System.out.println("Please enter the radius: ");
      double r = in.nextDouble();

      System.out.println("Please enter the height: ");
      double h = in.nextDouble();

      Sphere sp = new Sphere(r);
      double v = sp.getVolume();
      double s = sp.getSurfaceArea();

      System.out.println("The volume of the sphere is: " + v);
      System.out.println("The surface area of the sphere is: " + s);

      Cylinder cy = new Cylinder(r, h);
      v = cy.getVolume();
      s = cy.getSurfaceArea();

      System.out.println("The volume of the cylinder is: " + v);
      System.out.println("The surface area of the cylinder is: " + s);

      Cone co = new Cone(r, h);
      v = co.getVolume();
      s = co.getSurfaceArea();

      System.out.println("The volume of the cone is: " + v);
      System.out.println("The surface area of the cone is: " + s);
   }
}

Sphere.java

//Sphere.java - Jimmy Kurian

public class Sphere
{
   private double r;

   public Sphere(double aRadius)
   {
      r = aRadius;
   }

   public double getVolume()
   {
      return (4.0 / 3.0) * Math.PI * r * r * r;
   }

   public double getSurfaceArea()
   {
      return 4.0 * Math.PI * r * r;
   }
}