import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class CheckBoxTest4 extends JFrame implements ItemListener {
// the label the display the price
private JLabel display = new JLabel();
// a list of JCheckBox, with the the electronic names on it
// with the price
private JCheckBox computer = new JCheckBox("Computer: $900");
private JCheckBox dvd = new JCheckBox("DVD: $250");
private JCheckBox printer = new JCheckBox("Printer: $70");
private JCheckBox monitor = new JCheckBox("Monitor: $299");
private JPanel pricePanel = new JPanel(new GridLayout(2,2));
private int price = 0;
// constructor
public CheckBoxTest4() {
display.setOpaque(true);
// set the background color
display.setBackground(Color.white);
// set the font color
display.setForeground(Color.blue.darker());
// use html file, ..
set the font size
display.setText("The total price is $0
");
getContentPane().add(display);
// add the components to pricePanel
pricePanel.add(computer);
pricePanel.add(dvd);
pricePanel.add(printer);
pricePanel.add(monitor);
// setIcon set the icon for the checkbox
// the icon is set to be a computer icon with a black cross
// setSelectedIcon set the icon when you select the checkbox
// the icon is set be a computer icon without cross
computer.addItemListener(this);
computer.setBackground(Color.white);
computer.setIcon(new ImageIcon("images/computerx.jpg"));
computer.setSelectedIcon(new ImageIcon("images/computer.jpg"));
dvd.addItemListener(this);
dvd.setBackground(Color.white);
dvd.setIcon(new ImageIcon("images/dvdx.jpg"));
dvd.setSelectedIcon(new ImageIcon("images/dvd.jpg"));
printer.addItemListener(this);
printer.setBackground(Color.white);
printer.setIcon(new ImageIcon("images/printerx.jpg"));
printer.setSelectedIcon(new ImageIcon("images/printer.jpg"));
monitor.addItemListener(this);
monitor.setBackground(Color.white);
monitor.setIcon(new ImageIcon("images/monitorx.jpg"));
monitor.setSelectedIcon(new ImageIcon("images/monitor.jpg"));
getContentPane().add(pricePanel, BorderLayout.SOUTH);
}
public static void main(String[] args) {
CheckBoxTest4 f = new CheckBoxTest4();
f.setTitle("Bruin Computer Store");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.pack();
f.setVisible(true);
}
// override the method form ItemListener
public void itemStateChanged(ItemEvent e) {
// check the source first
// find out the source and get the price change
// if the source is selected, add the price change
// if it is not selected, deducted the price change
int change=0;
if(e.getSource() == computer) {
change = 900;
} else if (e.getSource() == dvd) {
change = 250;
} else if(e.getSource() == printer) {
change = 70;
} else if(e.getSource() == monitor) {
change =299;
}
if(e.getStateChange() == ItemEvent.SELECTED) {
price+=change;
} else if(e.getStateChange() == ItemEvent.DESELECTED) {
price-=change;
}
display.setText("The total price is $" + price + "
");
}
}