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Java Program to Calculate Area of a Circle

>> Saturday, January 30, 2016

The Mathematical formula to find Area of a Circle is : A= πr2 or we can write it as given below.
area = pi * radius * radius
So, to find Area of a circle we need the values of 'pi' and radius. In java we have predefined Mathematical value for pi is defined in java.lang.Math.PI = 3.141592653589793. PI is a static final value.
In our program we need to read radius value from the console by using BufferedReader or Console classes.
Calculate Area of a Circle using Java
Here is the simple source code to find the area of the circle. Compiled successfully on windows operating system.
package com.javabynataraj;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
//http://javabynataraj.blogspot.com
public class AreaOfCircle {
 public static void main(String[] args) {
  int radius = 0;
  double area;
  System.out.print("Please enter radius of a circle: ");
  try {
   BufferedReader br = new BufferedReader(new InputStreamReader(
     System.in));
   radius = Integer.parseInt(br.readLine());
  }
  // if any invalid value 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 = Math.PI * radius * radius;
  System.out.println("Area of a circle is: " + area);
 }
}
After the compilation enter the radius value and press enter.
Output:
Output_Calculate Area of a Circle using Java

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