Write a program in Java. Program: Inheritance A point in the x-y plane is repres

Question

Write a program in Java.

Program: Inheritance

A point in the x-y plane is represented by its x-coordinate and y-coordinate. Design the class Point that can store and process a point in the x-y plane. You should then perform operations on a point, such as showing the point, setting the coordinates of the point, printing the coordinates of the point, returning the x-coordinate, and returning the y-coordinate.

Every circle has a center and a radius. Given the radius, we can determine the circle’s area and circumference. Given the center, we can determine its position in the x-y plane. The center of a circle is a point in the x-y plane. Design the class Circle that can store the radius and center of the circle. Because the center is a point in the x-y plane and you designed the class to capture the properties of a point above, you must derive the class Circle from the class Point. You should be able to perform the usual operations on a circle, such as setting the radius, printing the radius, calculating and printing the area and circumference, and carrying out the usual operations on the center.

Every cylinder has a base and height, where the base is a circle. Design the class Cylinder that can capture the properties of a cylinder and perform the usual operations on a cylinder. Derive this class from the class Circle designed above. Some of the operations that can be performed on a cylinder are as follows: calculate and print the volume, calculate and print the surface area, set the height, set the radius of the base, and set the center of the base.

Write a program to test various operations on a point, circle and cylinder. Your program should be well documented both internally and externally.

Explanation / Answer

Point.java

public class Point {
   //Declaring instance variables
private int x,y;

//Zero Argumented constructor
public Point() {
   super();
}

//Parameterized constructor
public Point(int x, int y) {
   super();
   this.x = x;
   this.y = y;
}

//Getter and Setter methods
public int getX() {
   return x;
}

public void setX(int x) {
   this.x = x;
}

public int getY() {
   return y;
}

public void setY(int y) {
   this.y = y;
}

/* toString() method which displays
* the contents of an object inside it
*/
@Override
public String toString() {
   return "Point ("+ x + "," + y +")";
}

}

___________________

Circle.java

import java.text.DecimalFormat;

public class Circle extends Point {

   //Declaring instance variables
   private double radius;
  
   //Zero Argumented constructor
   public Circle()
   {
   this.radius=0.0;
   }
  
   //Parameterized constructor
   public Circle(int x, int y,double radius) {
       super(x, y);
   setRadius(radius);  
   }
  
   //Getter and Setter methods
   public double getRadius() {
       return radius;
   }
   public void setRadius(double radius) {
       if(radius>=0)
       this.radius = radius;
       else
       {
       System.out.println("Invalid.Radius Must be Positive.");
       radius=0.0;
       }
   }
   public double calArea()
   {
       return Math.PI*getRadius()*getRadius();
   }
  
   /* toString() method which displays
   * the contents of an object inside it
   */
   @Override
   public String toString() {
       DecimalFormat df=new DecimalFormat("#.##");
       System.out.println(super.toString());
       return "Circle# Radius=" + radius + " Area of Circle ="+df.format(calArea());
   }
  

}

________________________

Cylinder.java

import java.text.DecimalFormat;

public class Cylinder extends Circle {
   //Declaring instance variables
   private double height;

   //Zero Argumented constructor
   public Cylinder() {
       super();
   }

   //Parameterized constructor
   public Cylinder(int a,int b,double r,double height) {
       super(a,b,r);
       this.height = height;
   }

   //Getter and Setter methods
   public double getHeight() {
       return height;
   }

   public void setHeight(double height) {
       this.height = height;
   }

public double calVolume()
{
   return Math.PI*getRadius()*getRadius()*getHeight();
}

/* toString() method which displays
* the contents of an object inside it
*/
   @Override
   public String toString() {
       DecimalFormat df=new DecimalFormat("#.##");
       System.out.println(super.toString());
       return "Cylinder# Height=" + height + " Volume Of the Cylinder ="+df.format(calVolume());
   }
  

}

__________________________

Application.java

import java.util.ArrayList;
import java.util.Scanner;

public class Application {

   public static void main(String[] args) {
       //Declaring variables
       int x,y;
       double radius,height;
      
       //Creating an ArrayList Object
       ArrayList<Object> arl=new ArrayList<Object>();
      
       /* Scanner class object is used to
       * read the inputs entered by the user
       */
       Scanner sc=new Scanner(System.in);
      
       //Getting the point coordinates entered by the user
       System.out.print("Enter the X coordinate of Point :");
       x=sc.nextInt();
       System.out.print("Enter the Y coordinate of Point :");
       y=sc.nextInt();
      
       //Getting the radius of the circle enterd by the user
       System.out.print("Enter radius of the Circle :");
       radius=sc.nextDouble();
      
       //Getting the height of the circle entered by the user
       System.out.print("Enter Height of the Cylinder :");
       height=sc.nextDouble();
      
       /* Creating a Point class object by passing
       * the x,y coodinates as arguments
       */
       Point p=new Point(x, y);
      
       //Adding the Point class object to the ArrayList
       arl.add(p);
      
       /* Creating a Circle class object by passing
       * the x,y coodinates and radius as arguments
       */
       Circle c=new Circle(x, y, radius);
      
       //Adding the Circle class object to the ArrayList
       arl.add(c);
      
       /* Creating a Cylinder class object by passing
       * the x,y coodinates, radius,height as arguments
       */
       Cylinder cyl=new Cylinder(x, y, radius, height);
      
       //Adding the Cylinder class object to the ArrayList
       arl.add(cyl);
      
       //Displaying Each object Information
       System.out.println("_____Displaying each Object Information_____");
       for(Object o:arl)
       {
           System.out.println(o.toString());
           System.out.println("_________________");
       }
      
      
      

   }

}

________________________

Output:

Enter the X coordinate of Point :3
Enter the Y coordinate of Point :5
Enter radius of the Circle :4.5
Enter Height of the Cylinder :5
_____Displaying each Object Information_____
Point (3,5)
_________________
Point (3,5)
Circle#
Radius=4.5
Area of Circle =63.62
_________________
Point (3,5)
Circle#
Radius=4.5
Area of Circle =63.62
Cylinder#
Height=5.0
Volume Of the Cylinder =318.09
_________________

___Thank You

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