Cell solutions, a cell phone provider, sells the following packages: 300 minutes

Question

Cell solutions, a cell phone provider, sells the following packages:

300 minutes per month: $45.00 per month
800 minutes per month: $65.00 per month
1500 minutes per month: $99.00 per month

The provider sells the following phones (a 6 percent sales tax applies to the sale of a phone):

Model 100: $29.95
Model 110: $49.95
Model 200: $99.95

Customers may also select the following options:

Voice mail: $5.00 per month
Text messaging: $10.00 per month

Write an application that displays a menu system. THe menu system should allow the user to select one package, one phone, and any of the options desired. As the user selects items from the menu, the application should show the prices of the items selected.

Explanation / Answer

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
@SuppressWarnings({ "unchecked", "rawtypes" })
public class GUICellPhonePackages {
public static class CellPhonePackage extends JFrame {
/**
*
*/
private static final long serialVersionUID = 6548829860028144965L;
private static final int WINDOW_WIDTH = 400;
private static final int WINDOW_HEIGHT = 200;
private static final double CELL_PHONE_TAX = 1.06;
private static JPanel panel;
private static JLabel lblPackages;
private static JLabel lblPhones;
private static JLabel lblOptions;
private static JLabel lblTotalIs;
private static JLabel lblOutputTotal;
private static JComboBox cmbPackages;
private static JComboBox cmbCellPhones;
private static JList lstOptions;
private static String[] strArrPackages = {
"300 minutes per month: $45.00 per month",
"800 minutes per month: $65.00 per month",
"1500 minutes per month: $99.00 per month"
};
private static String[] strArrPhones = {
"Model 100: $29.95",
"Model 110: $49.95",
"Model 200: $99.95"
};
private static String[] strArrOptions = {
"Voice mail: $5.00 per month",
"Text messaging: $10.00 per month"
};
private DecimalFormat df = new DecimalFormat("#0.00");
private static double packageTotal;
private static double phoneTotal;
private static double optionTotal;
// Public Constructor
public CellPhonePackage () {
// Create a new window
JFrame window = new JFrame();
// Display the title
window.setTitle("Cell Phone Packages");
// Set the size of the window
window.setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
// Specify an action for the close button
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Build the panel and add it to the frame
buildPanel();
// Add the panel to the frame's content pane
window.add(panel);
// Display the window
window.setVisible(true);
}
private void buildPanel() {
// Create new labels
lblPackages = new JLabel("Choose your package:");
lblPhones = new JLabel("Choose your cell phone:");
lblOptions = new JLabel("Choose your options:");
lblTotalIs = new JLabel("Your total is:");
lblOutputTotal = new JLabel();
// Create combo boxes
cmbPackages = new JComboBox(strArrPackages);
cmbCellPhones = new JComboBox(strArrPhones);
// Create list component
lstOptions = new JList(strArrOptions);
// Set the selection to Multiple
lstOptions.setSelectionMode(
ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
// Action Listeners and List Selection Listener
cmbPackages.addActionListener(new packageListener());
cmbCellPhones.addActionListener(new phoneListener());
lstOptions.addListSelectionListener(new optionsListener());
// Instantiate the Panel object in the variable you already declared
panel = new JPanel();
// Add all the components to the object
panel.setLayout(new GridLayout(4, 2));
panel.add(lblPackages);
panel.add(cmbPackages);
panel.add(lblPhones);
panel.add(cmbCellPhones);
panel.add(lblOptions);
panel.add(lstOptions);
panel.add(lblTotalIs);
panel.add(lblOutputTotal);
}
public class packageListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
// Collect the data select
int packageSelected =
cmbPackages.getSelectedIndex();
// Which package did they choose?
if (packageSelected == 0) {
packageTotal = 45;
} else if (packageSelected == 1) {
packageTotal = 65;
} else if (packageSelected == 2) {
packageTotal = 99;
}
// Display the total
lblOutputTotal.setText("$" +
df.format(optionTotal+packageTotal+phoneTotal));
}
}
public class phoneListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
// Collect the data select
int phoneSelected =
cmbCellPhones.getSelectedIndex();
// Which phone did they choose?
if (phoneSelected == 0) {
phoneTotal = 29.95;
} else if (phoneSelected == 1) {
phoneTotal = 49.95;
} else if (phoneSelected == 2) {
phoneTotal = 99.95;
}
// Don't forget to tax
phoneTotal *= CELL_PHONE_TAX;
// Display the total
lblOutputTotal.setText("$" +
df.format(optionTotal+packageTotal+phoneTotal));
}
}
public class optionsListener implements ListSelectionListener {
@Override
public void valueChanged(ListSelectionEvent e) {
double temp = 0;
// Collect the data select
int optionSelected[] =
lstOptions.getSelectedIndices();
for (int i = 0; i < optionSelected.length; i++) {
// Which options did they choose?
if (optionSelected[i] == 0) {
temp += 5;
}
if (optionSelected[i] == 1) {
temp += 10;
}
}
optionTotal = temp;
// Display the total
lblOutputTotal.setText("$" +
df.format(optionTotal+packageTotal+phoneTotal));
}
}
}
// Main method:
public static void main(String[] args) {
new CellPhonePackage();
}
}

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