public void init() {
// set left-aligned flow layout
setLayout(new FlowLayout(FlowLayout.LEFT));
winXP = new Checkbox("Windows XP", null, true);
winVista = new Checkbox("Windows Vista");
solaris = new Checkbox("Solaris");
mac = new Checkbox("Mac OS");
add(winXP);
add(winVista);
add(solaris);
add(mac);
// register to receive item events
winXP.addItemListener(this);
winVista.addItemListener(this);
solaris.addItemListener(this);
mac.addItemListener(this);
}
// Repaint when status of a check box changes.
public void itemStateChanged(ItemEvent ie) {
repaint();
}
// Display current state of the check boxes.
public void paint(Graphics g) {
msg = "Current state: ";
g.drawString(msg, 6, 80);
msg = " Windows XP: " + winXP.getState();
g.drawString(msg, 6, 100);
msg = " Windows Vista: " + winVista.getState();
g.drawString(msg, 6, 120);
msg = " Solaris: " + solaris.getState();
g.drawString(msg, 6, 140);
msg = " Mac: " + mac.getState();
g.drawString(msg, 6, 160);
}
}
Here is sample output generated by the FlowLayoutDemo
applet. Compare this with the output from the
CheckboxDemo applet, shown earlier in Figure 24-2.
BorderLayout
The BorderLayout class implements a common layout
style for top-level windows. It has four narrow,
fixed-width components at the edges and one large
area in the center. The four sides are referred to as north,
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