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Compute the diameter, area and circumference of circle in Java

Compute the diameter, area and circumference of circle in Java

This java program has two versions; the console app and with the use of swing library (gui version).
The user will be asked to enter the radius of the circle then the program will compute its area, diameter and circumference.

Source code:

import javax.swing.*;
import java.text.*;
class AreaDiameterOfCircleGUI
{ 
public static void main(String[] args) {
String strradius;	 
double pi = 3.14159 , radius, area, diameter, circumference;
DecimalFormat numFormat = new DecimalFormat("0.00");

strradius = JOptionPane.showInputDialog(null,"Enter radius:");

radius=Double.parseDouble(strradius);

area= pi * radius * radius;
diameter= 2 * radius;
circumference = 2 * pi * radius;

JOptionPane.showMessageDialog(null,"Area: " + numFormat.format(area)  + "
" + "Diameter: " + numFormat.format(diameter) + "
" + "Circumference: " + numFormat.format(circumference));

	}
}