Chapter 14, Problem 1CP

Explanation of Solution

Program:

File name: “JCarlysCaterring.java”

//Import necessary header files

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

//Define a class named JCarlysCatering

public class JCarlysCatering extends JFrame implements ItemListener, ActionListener

{

    //Construct a new FlowLayout object

    FlowLayout flow = new FlowLayout();

//Create a JTextField component for capturing number of //guests

    JTextField guestsField = new JTextField(8);

    //Create a label with the text "Please enter number of //guests"

JLabel guestsLabel = new JLabel("Please enter number of guests");

    //Define CheckBoxes to capture user input for main course,

    //side, items, and desert.

    JCheckBox beefBox = new JCheckBox("Beef", false);

    JCheckBox chickenBox = new JCheckBox("Chicken", false);

    JCheckBox fishBox = new JCheckBox("Fish", false);

    JCheckBox pastaBox = new JCheckBox("Pasta", false);

    JCheckBox saladBox = new JCheckBox("Salad", false);

    JCheckBox vegBox = new JCheckBox("Mixed vegetables", false);

    JCheckBox potBox = new JCheckBox("Baked potato", false);

    JCheckBox breadBox = new JCheckBox("Garlic bread", false);

    JCheckBox cakeBox = new JCheckBox("Chocolate cake", false);

    JCheckBox pieBox = new JCheckBox("Apple pie", false);

JCheckBox pudBox = new JCheckBox("Butterscotch pudding", false);

    //Create a label with the text "Carly's Catering"

    JLabel mainLabel = new JLabel("Carly's Catering");

    //Set the font style of mainLabel contents

    Font font = new  Font("Ariel",Font.ITALIC, 30);

    //Create a label with the text "Total"

    JLabel label2 = new JLabel("Total");

    //Create a label with the text "Select options"

    JLabel label1 = new JLabel("Select options");

    JLabel totPrice = new JLabel();

    //Initialize the required variables

    double price = 0;

    String entreeString = "";

    String sideString = "";

    String dessertString = "";

    String output;

    int numSelected = 0;

    //Define a default constructor

    public JCarlysCatering()

    {

        //Set the title of the JFrame container

        super("Menu options");

        //Set the close and layout of the JFrame container

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setLayout(flow);

        //Define a ButtonGroup object entreeGroup

        ButtonGroup entreeGroup = new ButtonGroup();

  //Add the check boxes for the main menu items

        //to the entreeGroup

        entreeGroup.add(beefBox);

        entreeGroup.add(chickenBox);

        entreeGroup.add(fishBox);

        entreeGroup.add(pastaBox);

        //Define a ButtonGroup object dessertGroup

        ButtonGroup dessertGroup = new ButtonGroup();

        //Add the check boxes for the dessert menu items

        //to the dessertGroup

        dessertGroup.add(cakeBox);

        dessertGroup.add(pieBox);

        dessertGroup.add(pudBox);

        //Add respective components in an

        //order to the container

        add(mainLabel);

        add(guestsLabel);

        add(guestsField);

        add(label1);

        add(beefBox);

        add(chickenBox);

        add(fishBox);

        add(pastaBox);

        add(saladBox);

        add(vegBox);

        add(potBox);

        add(breadBox);

        add(cakeBox);

        add(pieBox);

        add(pudBox);

        mainLabel.setFont(font);

        add(label2);

        add(totPrice);

        totPrice.setText("$0");

        //Add the item listener to the buttons

        guestsField.addActionListener(this);

        beefBox.addItemListener(this);

        chickenBox.addItemListener(this);

        fishBox.addItemListener(this);

        pastaBox.addItemListener(this);

        saladBox.addItemListener(this);

        vegBox.addItemListener(this);

        potBox.addItemListener(this);

        breadBox.addItemListener(this);

        cakeBox.addItemListener(this);

        pieBox.addItemListener(this);

        pudBox.addItemListener(this);

    }

    //Override method

    @Override

    public void actionPerformed(ActionEvent e)

    {

        //Get the source

        Object source = e.getSource();

        final int PRICE_PER_GUEST = 35;

        //Check whether the text filed

        if(source == guestsField)

        {

            //Try block

            try

            {

                //Calculate the price

price = Integer.parseInt(guestsField.getText()) * PRICE_PER_GUEST;

            }

            //Catch exception

            catch(Exception exc)

            {

                //Set the number of quests to zero

                //when non-numeric value is entered

                price = 0;

            }

            //Set the output string

output = "$" + price + " Menu includes " + entreeString +

            sideString + dessertString;

            totPrice...