Java Program to Calculate Area of Circle

Calculate Circle Area using Java Example This Calculate Circle Area using Java Example shows how to calculate area of circle using it's radius. Output of Calculate Circle Area using Java Example would be Please enter radius of a circle 19 Area of a circle is 1134.1149479459152

 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
public class CalculateCircleAreaExample {
 
        public static void main(String[] args) {
               
                int radius = 0;
                System.out.println("Please enter radius of a circle");
               
                try
                {
                        //get the radius from console
                        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                        radius = Integer.parseInt(br.readLine());
                }
                //if invalid value was entered
                catch(NumberFormatException ne)
                {
                        System.out.println("Invalid radius value" + ne);
                        System.exit(0);
                }
                catch(IOException ioe)
                {
                        System.out.println("IO Error :" + ioe);
                        System.exit(0);
                }
               
                /*
                 * Area of a circle is
                 * pi * r * r
                 * where r is a radius of a circle.
                 */
               
                //NOTE : use Math.PI constant to get value of pi
                double area = Math.PI * radius * radius;
               
                System.out.println("Area of a circle is " + area);
        }
}

Java Programming Exercise :

Tags:

• Previous Java Programming
• Next On Java Programming