Area in java

import javax.swing.*;

public class Area {
  // Constant PI is defined at the class level
  static final double PI = 3.141592653589793;

  public static void main(String[] args) {
    // Local variables
    double radius, area;
    String r;

    // Input radius from keyboard
    r = JOptionPane.showInputDialog("Enter radius: ");
     radius=Double.parseDouble(r);
    // Perform calculations and display result
    area = PI * (radius * radius);
    System.out.println("The area is: " + area);
  }
}

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