Handling Events - Beginning Java - page 934

the color the menu item sets up. The actionPerformed() method just stores the Color object from the
listener object in the elementColor member of the SketcherFrame object.
Of course, the menu doesn't quite work as it should. The Color menu item check marks are not being set
correctly, as you can see in Figure 18-6 . You want an exclusive check, as with the radio buttons; having
more than one color checked at one time doesn't make sense.
FIGURE 18-6
Fixing the Color Menu Check Marks
One way to deal with the problem is to make the listener object for a color menu item set the check marks
for all the menu items. You could code this in the ColorListener inner class to SketcherFrame :
class ColorListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
elementColor = color;
// Set the checks for all menu items
redItem.setState(color.equals(RED));
greenItem.setState(color.equals(GREEN));
blueItem.setState(color.equals(BLUE));
yellowItem.setState(color.equals(YELLOW));
}
// Rest of the class as before...
}