JAVA - Calculate a circle’s circumference and area CONSOLE: Operation ? The appl

Question

JAVA - Calculate a circle’s circumference and area

CONSOLE:

Operation

? The application prompts the user to enter the radius of a circle.

? If the user enters invalid data, the application displays an appropriate error message and prompts the user again until the user enters valid data. (Invalid – not double data or double values less than 1.0)

? When the user enters a valid radius, the application calculates and displays the circumference and area of the circle to the nearest 2 decimal places.

? The application prompts the user to continue.

? When the user chooses not to continue, the application displays a goodbye message that indicates the number of Circle objects that were created by the application.

? The application then asks the user if they want a summary of the circles created – if yes, a list of the circles is displayed.

Specifications

? Create a class named Circle to store the data about this circle. This class should contain these constructors and methods: (maybe more if needed) public Circle(double radius) public double getCircumference() public String getFormattedCircumference() public double getArea() public String getFormattedArea() private String formatNumber(double x)

? The formulas for calculating circumference and area are: circumference = 2 * pi * radius area = pi * radius2

? For the value of pi, use the PI constant of the java.lang.Math class.

Welcome to the Circle Creator Enter radius:3 Circumference: 18.85 Area: 28.27 Continue? (y/n): y Enter radius: 6 Circumference: 37.7 Area: 113.1 Continue? (y/n): n Goodbye. You created 2 Circle object (s). Do you want to display a summary of the circles? (y/n): y Circle 1 - Radius 3 Circumference 18.85 Area 28.27 Circle 2-

Explanation / Answer

Circle.java

package org.students;

import java.text.DecimalFormat;

public class Circle

{
   float radius = 0;
   static int count = 0;
   double area = 0.0;
   double circumfrence = 0.0;
   DecimalFormat df2 = new DecimalFormat(".##");

   public Circle(float radius) {
       this.radius = radius;

       count++;
   }

   public int getcount() {
       return count;
   }

   public double getCircumference() {
       circumfrence = 2 * Math.PI * radius;
       return circumfrence;
   }

   public double getArea() {
       area = Math.PI * radius * radius;
       return area;
   }

   // private String formatNumber(double x)

   public String getFormattedCircumference() {

       return df2.format(getCircumference());
   }

   public String getFormattedArea() {
       return df2.format(getArea());
   }

}

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Test.java

package org.students;

import org.students.*;
import java.util.Scanner;

public class Test {

   public static void main(String[] args) {
       float radius = 0;
       int z = 0;

       String ra[] = new String[100];
       String aa[] = new String[100];
       String ca[] = new String[100];
       String area = null, circumfrence = null;
       Scanner sc = new Scanner(System.in);
       while (true) {
           System.out.print("Enter radius of the circle:");
           radius = sc.nextFloat();
           if (radius < 1.0) {
               continue;
           }

           else {
               Circle c = new Circle(radius);
               area = c.getFormattedArea();
               circumfrence = c.getFormattedCircumference();
               System.out.println(" ");
               System.out.println("area:" + area);
               System.out.println("circumfrence:" + circumfrence);
               int k = c.getcount();

               for (int i = z; i < c.count; i++) {
                   ra[i] = String.valueOf(radius);

                   aa[i] = c.getFormattedArea();

                   ca[i] = c.getFormattedCircumference();

                   z++;

               }

               System.out.println(" ");
               System.out.print("Do you want to continue(press Y/N):");
               char ch = sc.next(".").charAt(0);
               if (ch == 'y' || ch == 'Y') {
                   continue;
               } else {

                   System.out
                           .println(":: Good Bye ,No of Circle objects created :"
                                   + c.getcount());
                   System.out
                           .print("Do u want to display the summary of the circles(Y/N) :");
                   char ch1 = sc.next(".").charAt(0);
                   if (ch1 == 'y' || ch1 == 'Y') {
                       System.out.println(" ");
                       for (int i = 0; i < k; i++) {
                           System.out.println("Circle " + (i + 1) + ":");
                           System.out.println("Radius of the circle is:"
                                   + ra[i]);
                           System.out.println("area:" + aa[i]);
                           System.out.println("circumfrence:" + ca[i]);
                       }

                   } else {
                       break;
                   }
               }

           }
           break;
       }

   }

}

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