Question

Part Two: Download VendingChange.java (above). Run it and become familiar with the output. Essentially, you need to create a user friendly GUI app using the code parameters of VendingChange. Turn VendingChange.java into a GUI app.

1) Your program must display the input dialog.
2) You must check that the data entered by the user follows the required input. If not, your program must display an error dialog and exit.
3) If the input is valid, then your program must display a message dialog similar to the one shown in listing 2.12, but the message must pertain to VendingChange and not ChangeMaker. Your message dialog must show the number of pennies, nickels, dimes and quarters.
4) Your program must exit when the user closes the output message dialog.
5) Comment and document your program.

Complete the programming problems such that they produce output that looks similar to that shown in the text or upcoming class presentations (in-class and Announcements). Tips and formulas (if any) will be discussed in class. Additional details will be provided in class and Announcements.

add comments to code please.

import java.util.Scanner;

public class VendingChange
{
    public static void main(String[] args)
    {
        Scanner keyboard = new Scanner(System.in);

        System.out.println("Enter price of item");
        System.out.println
                ("(from 25 cents to a dollar, in 5-cent increments)");
        int originalAmount = keyboard.nextInt();
        int change = 100 - originalAmount;

        int quarters = change/25;
        change = change%25;// remaining change after deducting quarters
        int dimes = change/10;
        change = change%10;// remaining change after deducting dimes, too
        int nickels = change/5;
        change = change%5;
        int pennies = change;

        //The grammar will be incorrect if any of the values are 1
        //because the required program statements to handle that
        //situation have not been covered, yet.   
        System.out.println
                ("You bought an item for " + originalAmount
                + " and gave me a dollar,");
        System.out.println("so your change is");
        System.out.println(quarters + " quarters,");
        System.out.println(dimes + " dimes, and");
        System.out.println(nickels + " nickel.");
    }
}

Answer 1

O U T P U T

Message Box Result window:

J A V A C O D E

//Package declared is vendChange

package vendChange;

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JOptionPane;

import java.awt.Font;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import javax.swing.UIManager;

import java.awt.SystemColor;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class VendingChangeGUI extends JFrame {

   private JPanel contentPane;
   private JTextField textFieldPrice;

   /**
   * Launch the application.
   */
   public static void main(String[] args) {
       //Creating jFrame for GUI
       EventQueue.invokeLater(new Runnable() {
           public void run() {
               try {
                   VendingChangeGUI frame = new VendingChangeGUI();
                   //Setting maximize to false
                   frame.setResizable(false);
                   //setting location of app. to mid position
                   frame.setLocationRelativeTo(null);
                   //Setting look and feel(GUI) to current system look n feel
                   UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                   frame.setVisible(true);
               } catch (Exception e) {
                   e.printStackTrace();
               }
           }
       });
   }

   /**
   * Create the frame.
   */
   //declaring the default constructor
   public VendingChangeGUI() {
       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       setBounds(100, 100, 376, 195);
       contentPane = new JPanel();
       contentPane.setBackground(SystemColor.inactiveCaptionBorder);
       contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
       setContentPane(contentPane);
       contentPane.setLayout(null);
      
       //Setting welcome label
       JLabel lblNewLabel = new JLabel("Welcome to Vending Change GUI App.");
       lblNewLabel.setFont(new Font("Stencil", Font.PLAIN, 15));
       lblNewLabel.setBounds(39, 11, 321, 25);
       contentPane.add(lblNewLabel);
      
       //setting Price label
       JLabel lblNewLabel_1 = new JLabel("Enter Price of item:");
       lblNewLabel_1.setBackground(SystemColor.controlShadow);
       lblNewLabel_1.setFont(new Font("Tahoma", Font.PLAIN, 13));
       lblNewLabel_1.setBounds(64, 47, 128, 25);
       contentPane.add(lblNewLabel_1);
      
       //Creating textfield to enter values
       textFieldPrice = new JTextField();
       textFieldPrice.setBounds(212, 47, 64, 23);
       contentPane.add(textFieldPrice);
       textFieldPrice.setColumns(10);
      
       //textPane to display direction under price lable
       JTextPane txtpnfromCents = new JTextPane();
       txtpnfromCents.setFont(new Font("Tahoma", Font.ITALIC, 11));
       txtpnfromCents.setBackground(SystemColor.control);
       txtpnfromCents.setEditable(false);
       txtpnfromCents.setText("(from 25 cents to a dollar, in 5-cent increments)");
       txtpnfromCents.setBounds(64, 72, 140, 39);
       contentPane.add(txtpnfromCents);
      
       //Creating buy button
       JButton btnNewButton = new JButton("Buy");
      
       //Setting action listener to buy button
       btnNewButton.addActionListener(new ActionListener() {
           public void actionPerformed(ActionEvent arg0) {
              
               int originalAmount=0;
               //parsing the value of textbox Price
               try
               {
               originalAmount = Integer.parseInt(textFieldPrice.getText());
              
                  
               }
               catch(Exception e)
               {
                   JOptionPane.showMessageDialog(null, "Please provide a valid input","Error",JOptionPane.WARNING_MESSAGE);
                   dispose();
               }
               //Calculating change
       int change = 100 - originalAmount;

       int quarters = change/25;
       change = change%25;// remaining change after deducting quarters
       int dimes = change/10;
       change = change%10;// remaining change after deducting dimes, too
       int nickels = change/5;
       change = change%5;
       int pennies = change;
      
       //Displaying result to message box
       JFrame frame = new JFrame("Message");
       JOptionPane.showMessageDialog(frame,
               "You bought an item for "+ originalAmount + " and gave me a dollar, "
               + "so your change is "+quarters + " quarters, "+dimes + " dimes, and "+nickels + " nickel.");
       dispose();

              
           }
       });
       //adding buy button to content pane
       btnNewButton.setBounds(212, 81, 64, 23);
       contentPane.add(btnNewButton);
   }
}