Create a GUI application that allows the user to select a rate category (from a set of radio buttons), and enter the number of minutes of the call as a decimal into a text field. There should be separate Calculate Charges and Exit buttons implemented as a JPanel. Minutes Panel uses a 1X2 GridLayout. A dialog box should display the charge for the call. Implement LongDistance by extending JFrame and both MinutesPanel and RatePanel as separate classes that extend JPanel.

Kindly note that, you're to replace "at" with shift 2 as the text editor can't take the symbol

Explanation:

Below is the Java Swing implementation of the assignment.

=========================== LongDistance.java ====================================

import java.awt.GridLayout;

import javax.swing.*;

public class LongDistance extends JFrame{

  /**

  *

  */

  public static float rate;

  public static float minutes;

  public static float total;

  LongDistance(){

      RatePanel rp = new RatePanel();

      MinutesPanel mp = new MinutesPanel();

      ButtonsPanel bp = new ButtonsPanel();

      this.setLayout(new GridLayout(3, 1));

      this.add(rp);

      this.add(mp);

      this.add(bp);

      this.setDefaultCloseOperation(EXIT_ON_CLOSE);

      this.setSize(250, 250);

      this.setVisible(true);

  }

}

============================ RatePanel.java ==================================

import java.awt.Dimension;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.BorderFactory;

import javax.swing.ButtonGroup;

import javax.swing.JPanel;

import javax.swing.JRadioButton;

import javax.swing.border.Border;

public class RatePanel extends JPanel implements ActionListener {

  /**

  *

  */

  private JRadioButton jr1, jr2, jr3;

  RatePanel(){

      Border panelBorder = BorderFactory.createTitledBorder("Select a Rate Category");

      jr1 = new JRadioButton("Daytime ($0.7) per minute");

      jr2 = new JRadioButton("Evening ($0.12) per minute");

      jr3 = new JRadioButton("Off-Peak ($0.05) per minute");

      ButtonGroup bg = new ButtonGroup();

      this.setLayout(new GridLayout(3,1));

      this.setBorder(panelBorder);

      this.setPreferredSize(new Dimension(800, 150));

      this.add(jr1);

      this.add(jr2);

      this.add(jr3);

      bg.add(jr1);

      bg.add(jr2);

      bg.add(jr3);

      jr1.addActionListener(this);

      jr2.addActionListener(this);

      jr3.addActionListener(this);

  }

  "at"Override

  public void actionPerformed(ActionEvent arg0) {

      // TODO Auto-generated method stub

      if(arg0.getSource() == jr1){

          LongDistance.rate = 0.07f;

      }

      if(arg0.getSource() == jr2){

          LongDistance.rate = 0.12f;

      }

      if(arg0.getSource() == jr3){

          LongDistance.rate = 0.05f;

      }

  }

}

=============================== MinutesPanel.java =============================

import java.awt.Dimension;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import javax.swing.*;

import javax.swing.border.Border;

import javax.swing.event.DocumentListener;

public class MinutesPanel extends JPanel implements KeyListener{

  JTextField jt;

  MinutesPanel(){

      Border panelBorder = BorderFactory.createTitledBorder("Time Of Call");

      this.setLayout(new GridLayout(1, 2));

      JLabel jl = new JLabel("Minutes: ");

      jt = new JTextField();

jt.setBounds(50,50,150,20);

      this.setPreferredSize(new Dimension(10, 10));

      this.setBorder(panelBorder);

      this.add(jl);

      this.add(jt);

      jt.addKeyListener(this);

  }

  "at"Override

  public void keyPressed(KeyEvent arg0) {

      // TODO Auto-generated method stub

  }

  "at"Override

  public void keyReleased(KeyEvent arg0) {

      // TODO Auto-generated method stub

      if(jt.getText() != "")

          LongDistance.minutes = Float.parseFloat(jt.getText());

  }

  "at"Override

  public void keyTyped(KeyEvent arg0) {

      // TODO Auto-generated method stub

  }

}

============================= ButtonsPanel.java ============================

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

public class ButtonsPanel extends JPanel implements ActionListener{

  JButton calculate;

  JButton exit;

  ButtonsPanel(){

      calculate = new JButton("Calculate Charges");

      exit = new JButton("Exit");

      this.add(calculate);

      this.add(exit);

      calculate.addActionListener(this);

      exit.addActionListener(this);

  }

  "at"Override

  public void actionPerformed(ActionEvent arg0) {

      // TODO Auto-generated method stub

      if(arg0.getSource() == calculate){

          System.out.println("r " + LongDistance.rate);

          System.out.println("m " + LongDistance.minutes);

          LongDistance.total = LongDistance.rate * LongDistance.minutes;

          JOptionPane.showMessageDialog(null, "Total Charges: " +LongDistance.total);

      }

      if(arg0.getSource() == exit){

          System.exit(0);

      }

  }

}

============================ App.java==============================

public class App {

  public static void main(String[] args) {

      LongDistance ld = new LongDistance();

  }

}

Check the output below

answer; ron will have to compare ( b3: b4); /// good luck