Java Reference
In-Depth Information
Display 18.9
Labels with Changing Visibility
(part 2 of 3)
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)
54
{
55
String actionCommand = e.getActionCommand();
(continued)
