Question

VISUAL BASIC FOR APPLICATIONS PLEASE!!!!

A long distance provider charges the following rates for telephone calls:

Rate Category Rate Per minute

Daytime (6:00A.M through 5:59P.M) $0.07

Evening (6:00P.M through 11:59P.M) $0.12

Off Peak (12:00A.M through 5:59A.M) $0.05

Create an application that allows the user to select a rate category and enter the number of minutes of the call, then display the charges.

Use the following test data to determine if the application is calculating properly:

Rate Category and Minutes Charge

Daytime, 20 minutes $1.40

Evening, 20 minutes $2.40

Offpeak, 20 minutes $1.00

Answer 1

//RatePanel.java

import java.text.DecimalFormat;

//computes the rate for the minutes

public class RatePanel

{

     //default constructor

     RatePanel()

     {       

     }

     public double computeRate(String time, double value)

     {

          DecimalFormat df=new DecimalFormat("0.##");

          double rate=0.00;

          if(time.equals("DayTime"))

          {

              rate= value * 0.07;

          }

          if(time.equals("EveningTime"))

          {

              rate=value*0.12;

          }

          if(time.equals("PeakOffTime"))

          {

              rate= value*0.05;

          }

          return Double.parseDouble(df.format(rate));

     }

}

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//MinutesPanel.java

import javax.swing.*;

import java.awt.event.*;

import java.awt.*;

//this class will develop the panel

// and add the listeners to the events

class MinutesPanel extends JFrame

{

     RatePanel rp=new RatePanel();

     private JPanel panel;         // A holding panel

     private JLabel messageLabel; // A message to the user

     private JTextField minutesTextField;

     // To hold user input

     private JRadioButton DayButton;      

     private JRadioButton EveningButton;  

     private JRadioButton Off_peakButton;

     // To group radio buttons

     private ButtonGroup radioButtonGroup;

     /* Constructor */

     public MinutesPanel()

     {       

          // Build the panel and add it to the frame.

          buildPanel();

          // Add the panel to the frame's content pane.

          add(panel);      

          // Specify an action for the close button.

          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

     }

     /**

     The buildPanel method adds a label, text field, and

     and three buttons to a panel.

     */

     private void buildPanel()

     {

          JPanel panel1=new JPanel(new GridLayout(1,2));

          JPanel panel2=new JPanel(new GridLayout(1,3));

          // Create the label, text field

          messageLabel = new

          JLabel(" Enter number of minutes ");

          minutesTextField = new JTextField(10);

          //add the components to panel1

          panel1.add(messageLabel);

          panel1.add(minutesTextField);

        

          //Create radio buttons

          DayButton = new JRadioButton("Day Time");

          EveningButton = new JRadioButton(" Evening Time");

          Off_peakButton = new JRadioButton("Off-peak");

          //add the components to panel2

          panel2.add(DayButton);

          panel2.add(EveningButton);

          panel2.add(Off_peakButton);

          // Group the radio buttons.

          radioButtonGroup = new ButtonGroup();

          radioButtonGroup.add(DayButton);

          radioButtonGroup.add(EveningButton);

          radioButtonGroup.add(Off_peakButton);

          // Add action listeners to the radio buttons.

          DayButton.addActionListener(new RadioButtonListener());

          EveningButton.addActionListener(new RadioButtonListener());

          Off_peakButton.addActionListener (new RadioButtonListener());

          // Create a panel and add the components to it.

          panel = new JPanel(new FlowLayout());

          panel.add(panel1);

          panel.add(panel2);    

     }

     /**

     Private inner class that handles the event when

     the user clicks one of the radio buttons.

     */

     private class RadioButtonListener   implements ActionListener

     {

          public void actionPerformed(ActionEvent e)

          {

              String input;   // To hold the user's input

              double result = 0.0;   // To hold the conversion

              input = minutesTextField.getText();

              // Determine which radio button was clicked.

              if (e.getSource() == DayButton)

              {

                   result = rp.computeRate("DayTime", Double.parseDouble(input));

              }

              else if (e.getSource() == EveningButton)

              {

                   result = rp.computeRate("EveningTime", Double.parseDouble(input));

              }

              else if (e.getSource() == Off_peakButton)

              {

                   result = rp.computeRate("PeakOffTime", Double.parseDouble(input));

              }

              // Display the conversion.

              JOptionPane.showMessageDialog (null," Call charges is: $ " + result );

          }

     }

}

----------------------------------------------------

//Main.java

import javax.swing.JFrame;

public class Main

{

     private static final int WINDOW_WIDTH = 350; // Window width

     private static final int WINDOW_HEIGHT = 150; // Window height

     public static void main(String args[])

     {

          //create object to the MinutesPanel class

          MinutesPanel mp=new MinutesPanel();      

          // Set the size of the window.

          mp.setSize(WINDOW_WIDTH, WINDOW_HEIGHT);

          // Display the window.

          mp.setVisible(true);

          // Set the title.

          mp.setTitle("Long Distance calls");

     }

}