Calculate Area and Perimeter of a Circle in Java

Main Method: 

 
package online1;

import java.util.Scanner;

/**

 *

 * @author common

 */

public class TeatCircle 

{

   public static void main(String[] args)

   {

       Circle C = new Circle();

       Scanner S = new Scanner(System.in);

       

       System.out.println("Redious: ");

       double a = S.nextDouble();      

       C.setRadius(a);

       

       System.out.println("Area: "+C.getArea());   

       System.out.println("Perimeter: "+C.getPerimeter());

       

   }

    

}

 

Circle Class: 

 

package online1;

 

/**

 *

 * @author common

 */

public class Circle 

{

       public double r;

       double area,peri;

       

       public  void setRadius(double r) ///save the value 

       {         

           this.r = r;          

       }       

       public double getArea() ///calculate the area

       {

           area  = 3.1416*Math.pow(r, 2);

           return area;

       }      

       public double getPerimeter() ///calculate the Perimeter

       {              

           peri = 2*3.1416*r;

           return peri;

       }

}