// File:  VolumeApplet.java
//
// Applet to calculate sphere volumes

import java.awt.*;
import java.awt.event.*;

public class VolumeApplet extends java.applet.Applet
		implements ActionListener
{
   int radius;
   double volume;
   Label prompt1,prompt2;
   TextField input, output;

   public void init()
   {
      prompt1 = new Label("Enter the radius of a sphere:  ");
      add(prompt1);

      input = new TextField(10);
      input.addActionListener(this);
      add(input);

      prompt2 = new Label("The volume of the sphere is:  ");
      add(prompt2);

      output = new TextField(30);
      add(output);
   }


   public void actionPerformed (ActionEvent e)
   {
      Double vol;

      radius = Integer.parseInt (input.getText() );

      volume = (4.0/3.0) * Math.PI * Math.pow(radius,3);
      vol = new Double(volume);      
      output.setText(vol.toString());
   }
    
}