How to Calculate Circle Area using Java

How to Calculate Circle Area using Java

Previous post we learnt how to use System.in java method.Today we are going to calculate circle area using certain Java functions.

Calculating Circle Area using java 

Start your IDE and type below code.

[

import java.io.BufferedReader;
import  java.io.IOException;
import java.io.InputStreamReader;
public class CircleArea {

    public static void main(String args[])
    {
        int circleRadius=0;
        System.out.println("Enter Radius of the Circle");
        try        {
            BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));

            circleRadius=Integer.parseInt(reader.readLine());
        }
        catch(NumberFormatException e1)
        {
            System.out.println("Invalid Radius Entered" + e1);
            System.exit(0);
        }
        catch(IOException e2)
        {

            System.out.println("Input Output Error :" + e2);
            System.exit(0);
        }

        double circleArea=Math.PI* circleRadius*circleRadius;


        System.out.println("The circle Area with Radius of "+circleRadius+" is "+circleArea);



    }





}

]

See also

How to calculate Rectangle Area