// Exercise 6.6: SphereTest.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SphereTest extends JApplet
             implements ActionListener {
   JLabel prompt;
   JTextField input;

   public void init()
   {
      Container c = getContentPane();
      c.setLayout( new FlowLayout() );

      prompt = new JLabel( "Enter sphere radius: " );
      input = new JTextField( 10 );
      input.addActionListener( this );
      c.add( prompt );
      c.add( input );
   }

   public void actionPerformed( ActionEvent e )
   {
      double radius =
         Double.parseDouble( e.getActionCommand() );
      showStatus( "Volume is " + sphereVolume( radius ) );
   }

   public double sphereVolume( double radius )
   {
      double volume =
         ( 4.0 / 3.0 ) * Math.PI * Math.pow( radius, 3 );

      return volume;
   }
}

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