Need comments added please. import java.util.*; class Point { private double X;

Question

Need comments added please.

import java.util.*;

class Point
{
   private double X;
   private double Y;
   public Point()
   {
      
   }
   public double GetX()
   {
       return X;
   }
   public double GetY()
   {
       return Y;
   }
   public void SetX(double NX)
   {
       X = NX;
   }
   public void SetY(double NY)
   {
       Y = NY;
   }
   public double DistBetween(Point P)
   {
       return Math.sqrt((this.X-P.GetX())*(this.X-P.GetX()) + (this.Y-P.GetY())*(this.Y-P.GetY()));
   }
   public double Slope(Point P)
   {
       if((this.X - P.GetX()) == 0.0)
       {
           System.out.println("Slope is infinite");
           return 0;
       }
       else
           return (this.Y - P.GetY())/(this.X - P.GetX());
   }
   void print()
   {
       System.out.println("X: " + X + " Y: " + Y);
   }
}
class Circle extends Point
{
   double Rad;
   public Circle()
   {
      
   }
   double GetRad()
   {
       return Rad;
   }
   void SetRad(double NR)
   {
       Rad = NR;
   }
   double GetCircum()
   {
       return 2 * 3.14 * Rad;
   }
   double GetArea()
   {
       return 3.14 * Rad * Rad;
   }
   public void SetCen(Point P)
   {
       SetX(P.GetX());
       SetY(P.GetY());
   }
}
class Cylinder extends Circle
{
   double Hght;
   public Cylinder(double H, Circle C)
   {
       Hght = H;
       SetRad(C.GetRad());
       SetX(C.GetX());
       SetY(C.GetY());
   }
   public double Vol()
   {
       return GetArea() * Hght;
   }
   public double SurArea()
   {
       return GetCircum() * Hght;
   }
   public void SetHght(double H)
   {
       Hght = H;
   }
   public double GetHght()
   {
       return Hght;
   }
}
class Sphere extends Circle
{
   public Sphere(double NR)
   {
       SetRad(NR);
   }
   public double Vol()
   {
       return (4/3) * 3.14 * GetRad() * GetRad() * GetRad();
   }
   public double SurArea()
   {
       return 4 * 3.14 * GetRad() * GetRad();
   }
}
class Cone extends Circle
{
   double Hght;
   public Cone(double H, double NR)
   {
       Hght = H;
       SetRad(NR);
   }
   public double Vol()
   {
       return (GetArea() * Hght) / 3.0;
   }
   public double SurArea()
   {
       double Rad = GetRad();
       return 3.14 * Rad * (Rad + Math.sqrt(Hght * Hght + Rad * Rad));
   }
   public void SetHght(double H)
   {
       Hght = H;
   }
   public double GetHght()
   {
       return Hght;
   }
}

Explanation / Answer

Code with comments

// importing all the classes of java.util package
import java.util.*;

// defining a class with name Point
class Point
{
   // declaring two private member variables of type double
private double X;
private double Y;
// constructor
public Point()
{
  
}
// getter method for x
public double GetX()
{
   // return value of x
return X;
}
// getter method for x
public double GetY()
{
   // return value of x
return Y;
}
// Mutator function for x
public void SetX(double NX)
{
   // set x to given value
X = NX;
}
// Mutator function for y
public void SetY(double NY)
{
   // set y to given value
Y = NY;
}
// function to calculaye distance between given point and calling point
public double DistBetween(Point P)
{
   // distance formula is sqrt((x1-x2)^2 + (y1-y2)^2)
return Math.sqrt((this.X-P.GetX())*(this.X-P.GetX()) + (this.Y-P.GetY())*(this.Y-P.GetY()));
}
// function to find slope of line joining given point and calling point
public double Slope(Point P)
{
   // slope is calculated as ratio of difference in y co-ordinates to difference in x co-ordinates
   // slope is infinite of x co-ordinate of both points are same
if((this.X - P.GetX()) == 0.0)
{
System.out.println("Slope is infinite");
return 0;
}
else
return (this.Y - P.GetY())/(this.X - P.GetX());
}
  
// function to print x and y co-ordinates of given point
void print()
{
System.out.println("X: " + X + " Y: " + Y);
}
}

// Circle class inherited from Point
class Circle extends Point
{
   // new variable for radius
double Rad;
// constructor
public Circle()
{
  
}
// getter method for radius
double GetRad()
{
return Rad;
}
// mutator method for radius
void SetRad(double NR)
{
Rad = NR;
}
// function to calculate and return circumference
double GetCircum()
{
   // circumference is 2*pi*radius
return 2 * 3.14 * Rad;
}
// function to calculate and return area of circle
double GetArea()
{
return 3.14 * Rad * Rad;
}
// function to set given point as center of circle
public void SetCen(Point P)
{
SetX(P.GetX());
SetY(P.GetY());
}
}

// Cylinder class inheriting from Circle
class Cylinder extends Circle
{
   // new member variable height
double Hght;
// constructor takes height and circle object
public Cylinder(double H, Circle C)
{
Hght = H;
// get radius of circle and set it to cylinder
SetRad(C.GetRad());
// set x and y co-ordinates of circle and set then to cylinder
SetX(C.GetX());
SetY(C.GetY());
}
// function to calculate and return volume
public double Vol()
{
   // area of circle multiplied with height gives volume
return GetArea() * Hght;
}
// function to calculate and return surface area
public double SurArea()
{
   // circumference of circle multiplied with height gives surface area
return GetCircum() * Hght;
}
// mutator function for height
public void SetHght(double H)
{
Hght = H;
}
// getter method for height
public double GetHght()
{
return Hght;
}
}

// Sphere class inheriting from Circle
class Sphere extends Circle
{
   // constructor with radius as parameter
public Sphere(double NR)
{
SetRad(NR);
}
// function to calculate and return volume
public double Vol()
{
   // volume of sphere is 4/3*pi*rad^3
return (4/3) * 3.14 * GetRad() * GetRad() * GetRad();
}
// function to calculate and return surface area
public double SurArea()
{
   // Surface area of sphere is 4*pi*rad^2
return 4 * 3.14 * GetRad() * GetRad();
}
}

// Cone class inheriting from Circle
class Cone extends Circle
{
   // new member variable height
double Hght;
// constructor with height and radius as parameters
public Cone(double H, double NR)
{
Hght = H;
SetRad(NR);
}
// function to calculate and return volume
public double Vol()
{
   // volume of cone is Area of cirle * height / 3
return (GetArea() * Hght) / 3.0;
}
// function to calculate and return surface area
public double SurArea()
{
double Rad = GetRad();
// surface area is pi*rad*(rad+sqrt(ht^2 + rad^2))
return 3.14 * Rad * (Rad + Math.sqrt(Hght * Hght + Rad * Rad));
}
// mutator method for height
public void SetHght(double H)
{
Hght = H;
}
// getter method for height
public double GetHght()
{
return Hght;
}
}

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