buttontest.java

经典的<<C how to program>一书第三版的例程。非常适合于C的初学者。

// Fig. 29.11: ButtonTest.java
// Creating JButtons.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ButtonTest extends JFrame {
   private JButton plainButton, fancyButton;

   public ButtonTest()
   {
      super( "Testing Buttons" );

      Container c = getContentPane();
      c.setLayout( new FlowLayout() );

      // create buttons
      plainButton = new JButton( "Plain Button" );
      c.add( plainButton );

      Icon bug1 = new ImageIcon( "bug1.gif" );
      Icon bug2 = new ImageIcon( "bug2.gif" );
      fancyButton = new JButton( "Fancy Button", bug1 );
      fancyButton.setRolloverIcon( bug2 );
      c.add( fancyButton );

      // create an instance of inner class ButtonHandler
      // to use for button event handling 
      ButtonHandler handler = new ButtonHandler();
      fancyButton.addActionListener( handler );
      plainButton.addActionListener( handler );

      setSize( 275, 100 );
      show();
   }

   public static void main( String args[] )
   { 
      ButtonTest app = new ButtonTest();

      app.addWindowListener(
         new WindowAdapter() {
            public void windowClosing( WindowEvent e )
            {
               System.exit( 0 );
            }
         }
      );
   }

   // inner class for button event handling
   private class ButtonHandler implements ActionListener {
      public void actionPerformed( ActionEvent e )
      {
         JOptionPane.showMessageDialog( null,
            "You pressed: " + e.getActionCommand() );
      }
   }
}

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