Write a Circle Class that has the followingfields: · Radius: adouble · PI: afina

Question

Write a Circle Class that has the followingfields:

·         Radius: adouble

·         PI: afinal double initialized with the value 3.14159

The class should have the following methods:

·        Constructor. Accepts the radius of the circle asan argument.

·        setRadius. A mutator method for the radiusfield.

·        getRadius. An accessor method for the radiusfield.

·        getArea. Returns the area of the circle, which iscalculate as

area = PI * radius* radius

·        getDiameter. Returns the diameter of the circle,which is calculated as

diameter = radius* 2

·        getCircumference. Returns the circumference of theof the circle, which is calculated as

circumference = 2 *PI * radius

Write a program that demonstrates the Circle class by asking theuser for the circle’s radius, creating aCircle object, and then reporting thecircle’s area, diameter, and circumference.

Explanation / Answer

Dear.. import java.util.*;
import java.lang.*;
import java.io.*;

class circle
{
   public static void main(String args[])
{
       Scanner s;
      Scanner l;
      String input_rec;
       int cx;
       int cy;
      int px;
      int py;
      double radius;
      double area;
      double circ;       double diameter;
      s = new Scanner( System.in );
     System.out.printf( "enter point ofcentre: " );
      input_rec = s.nextLine( );
      l = new Scanner( input_rec );
      cx = l.nextInt( );
      cy = l.nextInt( );
      System.out.printf( "enter point oncircle: " );
      input_rec = s.nextLine( );
      l = new Scanner( input_rec );
      px = l.nextInt( );
      py = l.nextInt( );
      radius = Math.sqrt( (double)(((cx-px)*(cx-px)) + (cy-py)*(cy-py)));
     area = Math.PI * radius * radius;
     circ = Math.PI * 2 * radius;
    diameter =Math PI* radius * 2;
    System.out.printf( "radius = %.2funits ", radius );
   System.out.printf( "diameter = %.2f units ",radius * 2 );
     System.out.printf( "area = %.2f squnits ", area );
     System.out.printf( "circumference =%.2f ", circ );    } }

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