In this tutorial, we are going to write a **Java program to calculate the area of a circle using radius** in java Programming with practical program code and step-by-step full complete explanation.

## Java program to calculate the area of a circle using radius.

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 { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); radius = Integer.parseInt(br.readLine()); } 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); } double area = Math.PI * radius * radius; System.out.println("Area of a circle is " + area); } }

### Output

Please enter radius of a circle 5 Area of a circle is 78.53981633974483

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