# Calculate Circle Area using Java Example

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Calculate Circle Area using Java Example This Calculate Circle Area using Java Example shows how to calculate area of circle using it’s radius.

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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); } } |

Output of Calculate Circle Area using Java Example would be

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Please enter radius of a circle 19 Area of a circle is 1134.1149479459152 |