Swing II - Absolute Java - page 1039

Display 18.9 Labels with Changing Visibility (part 2 of 3)

18 public static void main(String[] args)
19 {
20 VisibilityDemo demoGui = new VisibilityDemo();
21 demoGui.setVisible( true );
22 }

23 public VisibilityDemo()
24 {
25 setSize(WIDTH, HEIGHT);
26 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
27 setTitle("Visibility Demonstration");

28 setLayout( new BorderLayout());

29 JPanel picturePanel = new JPanel();
30 picturePanel.setBackground(Color.WHITE);
31 picturePanel.setLayout( new FlowLayout());

32 ImageIcon dukeStandingIcon =
33 new ImageIcon("duke_standing.gif");
34 standingLabel = new JLabel(dukeStandingIcon);
35 standingLabel.setVisible( true );
36 picturePanel.add(standingLabel);

37 ImageIcon dukeWavingIcon = new ImageIcon("duke_waving.gif");
38 wavingLabel = new JLabel(dukeWavingIcon);
39 wavingLabel.setVisible( false );
40 picturePanel.add(wavingLabel);

41 add(picturePanel, BorderLayout.CENTER);

42 JPanel buttonPanel = new JPanel();
43 buttonPanel.setBackground(Color.LIGHT_GRAY);
44 buttonPanel.setLayout( new FlowLayout());

45 JButton waveButton = new JButton("Wave");
46 waveButton.addActionListener( this );
47 buttonPanel.add(waveButton);

48 JButton stopButton = new JButton("Stop");
49 stopButton.addActionListener( this );
50 buttonPanel.add(stopButton);
51 add(buttonPanel, BorderLayout.SOUTH);
52 }
53

public void actionPerformed(ActionEvent e)

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