spheretest.java

《java大学教程》源码

// Exercise 6.6: SphereTest.java

// Java core packages
import java.awt.*;
import java.awt.event.*;

// Java extension packages
import javax.swing.*;

public class SphereTest extends JApplet
   implements ActionListener {

   JLabel promptLabel;
   JTextField inputField;

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

      promptLabel = new JLabel( "Enter sphere radius: " );
      inputField = new JTextField( 10 );
      inputField.addActionListener( this );
      container.add( promptLabel );
      container.add( inputField );
   }

   public void actionPerformed( ActionEvent actionEvent )
   {
      double radius =
         Double.parseDouble( actionEvent.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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