Checkboxes and Radio Buttons - Con't
The following application, DriveThrough, lets us
check off selections on a fast food menu, as shown in Figure 14-
1. DriveThrough prints the results when we press the
Place Order button. Therefore, we can ignore all the
events generated by our checkboxes and radio buttons and listen
only for the action events generated by the regular button.
//file: DriveThrough.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class DriveThrough {
public static void main(String[] args) {
JFrame f = new JFrame("Lister v1.0");
f.setSize(300, 150);
f.setLocation(200, 200);
f.addWindowListener(new WindowAdapter( ) {
public void windowClosing(WindowEvent we) { System.exit(0); }
});
JPanel entreePanel = new JPanel( );
final ButtonGroup entreeGroup = new ButtonGroup( );
JRadioButton radioButton;
entreePanel.add(radioButton = new JRadioButton("Beef"));
radioButton.setActionCommand("Beef");
entreeGroup.add(radioButton);
entreePanel.add(radioButton = new JRadioButton("Chicken"));
radioButton.setActionCommand("Chicken");
entreeGroup.add(radioButton);
entreePanel.add(radioButton = new JRadioButton("Veggie", true));
radioButton.setActionCommand("Veggie");
entreeGroup.add(radioButton);
final JPanel condimentsPanel = new JPanel( );
condimentsPanel.add(new JCheckBox("Ketchup"));
condimentsPanel.add(new JCheckBox("Mustard"));
condimentsPanel.add(new JCheckBox("Pickles"));
JPanel orderPanel = new JPanel( );
JButton orderButton = new JButton("Place Order");
orderPanel.add(orderButton);
Container content = f.getContentPane( );
content.setLayout(new GridLayout(3, 1));
content.add(entreePanel);
content.add(condimentsPanel);
content.add(orderPanel);
orderButton.addActionListener(new ActionListener( ) {
public void actionPerformed(ActionEvent ae) {
String entree =
entreeGroup.getSelection().getActionCommand( );
System.out.println(entree + " sandwich");
Component[] components = condimentsPanel.getComponents( );
for (int i = 0; i < components.length; i++) {
JCheckBox cb = (JCheckBox)components[i];
if (cb.isSelected( ))
System.out.println("With " + cb.getText( ));
}
}
});
f.setVisible(true);
}
}
Figure 14-1. The DriveThrough application
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