CSS/562: Programming Concepts - NetBeans JAVA Programming

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Question

Hi, previously I requested assistance with Java programming question. I now need to further modify the below code to add additional functionality. The requirements for specific functionality is below.

The customer is pleased with the first set of functionality and features added to the business application in Week 2. This week the customer wants you to add functionality and features to the application you created last week.

Modify the deliverable from Week 2 to:

· Include a combo box for the locations with five cities of your choice.

· Modify the food field to make it automatically place a value in that field based on the location selected.

· The values for the food field will be 70 when the first location is selected, 80 when the second location is selected.

· The food values will then increase by 5 for the remaining locations when selected.

· Add to the car field to allow for three rental car companies to select from using a radio button.

· The value for the cost of the rental car will remain as a text field.

This is the existing code requiring modification.

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public class NewJFrame2 extends javax.swing.JFrame {

   

  public NewJFrame2() {

    initComponents();

  }

   

  @SuppressWarnings("unchecked")

              

  private void initComponents() {

// Create the labels using Java Swing 

    label1 = new java.awt.Label();

    label2 = new java.awt.Label();

    label3 = new java.awt.Label();

    label4 = new java.awt.Label();

    label5 = new java.awt.Label();

    label6 = new java.awt.Label();

    jTextField1 = new javax.swing.JTextField();

    jTextField2 = new javax.swing.JTextField();

    jTextField3 = new javax.swing.JTextField();

    jTextField4 = new javax.swing.JTextField();

    jTextField5 = new javax.swing.JTextField();

    jTextField6 = new javax.swing.JTextField();

    jButton1 = new javax.swing.JButton();

    label7 = new java.awt.Label();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

// assign label text and button listening event. 

    label1.setText("Traveler name ");

    label2.setText("Airfare cost ");

    label3.setText("Food cost ");

    label4.setText("Car cost ");

    label5.setText("Hotel cost ");

    label6.setText("Shuttle cost ");

    jButton1.setText("Calculation Total");

    jButton1.addActionListener(new java.awt.event.ActionListener() {

      public void actionPerformed(java.awt.event.ActionEvent evt) {

        jButton1ActionPerformed(evt);

      }

    });

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

    getContentPane().setLayout(layout);

    layout.setHorizontalGroup(

      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

      .addGroup(layout.createSequentialGroup()

        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

          .addGroup(layout.createSequentialGroup()

            .addGap(123, 123, 123)

            .addComponent(label7, javax.swing.GroupLayout.PREFERRED_SIZE, 409, javax.swing.GroupLayout.PREFERRED_SIZE))

          .addGroup(layout.createSequentialGroup()

            .addContainerGap()

            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.CENTER)

              .addComponent(label6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

              .addComponent(label1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

              .addComponent(label2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

              .addComponent(label5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

              .addComponent(jButton1)

              .addComponent(label3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

              .addComponent(label4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

            .addGap(179, 179, 179)

            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

              .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 184, javax.swing.GroupLayout.PREFERRED_SIZE)

              .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)

                .addComponent(jTextField6, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 70, Short.MAX_VALUE)

                .addComponent(jTextField5, javax.swing.GroupLayout.Alignment.LEADING)

                .addComponent(jTextField4, javax.swing.GroupLayout.Alignment.LEADING)

                .addComponent(jTextField3, javax.swing.GroupLayout.Alignment.LEADING)

                .addComponent(jTextField2, javax.swing.GroupLayout.Alignment.LEADING)))))

        .addContainerGap(123, Short.MAX_VALUE))

    );

    layout.setVerticalGroup(

      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

      .addGroup(layout.createSequentialGroup()

        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

          .addComponent(label1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

          .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

        .addGap(21, 21, 21)

        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

          .addComponent(label2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

          .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

        .addGap(30, 30, 30)

        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

          .addComponent(label3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

          .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

        .addGap(29, 29, 29)

        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

          .addComponent(label5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

          .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

        .addGap(26, 26, 26)

        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

          .addComponent(label4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

          .addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

        .addGap(23, 23, 23)

        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

          .addComponent(label6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

          .addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

        .addGap(28, 28, 28)

        .addComponent(jButton1)

        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 41, Short.MAX_VALUE)

        .addComponent(label7, javax.swing.GroupLayout.PREFERRED_SIZE, 121, javax.swing.GroupLayout.PREFERRED_SIZE)

        .addGap(19, 19, 19))

    );

    pack();

  }            

  private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                     

     

//Declare variables to hold data. Set total to equal data values held in arfare,food hotel, car and shuttle

String Travelername = jTextField1.getText();

double Airfarecost = Double.parseDouble(jTextField2.getText()) ;

double Foodcost = Double.parseDouble(jTextField3.getText()) ;

double Hotelcost = Double.parseDouble(jTextField4.getText()) ;

double Carcost = Double.parseDouble(jTextField5.getText()) ;

double Shuttlecost = Double.parseDouble(jTextField6.getText()) ;

double total = Airfarecost+Foodcost+Hotelcost+Carcost+Shuttlecost;

//add ten percent of cost to total value by multiplying total by 0.1 

 total = total + total*0.1;

 

 

label7.setText("The travel cost is "+total);

     

     

     

     

     

     

  }                     

   

  public static void main(String args[]) {

     

    try {

      for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {

        if ("Nimbus".equals(info.getName())) {

          javax.swing.UIManager.setLookAndFeel(info.getClassName());

          break;

        }

      }

    } catch (ClassNotFoundException ex) {

      java.util.logging.Logger.getLogger(NewJFrame2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

    } catch (InstantiationException ex) {

      java.util.logging.Logger.getLogger(NewJFrame2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

    } catch (IllegalAccessException ex) {

      java.util.logging.Logger.getLogger(NewJFrame2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

    } catch (javax.swing.UnsupportedLookAndFeelException ex) {

      java.util.logging.Logger.getLogger(NewJFrame2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

    }

     

    java.awt.EventQueue.invokeLater(new Runnable() {

      public void run() {

        new NewJFrame2().setVisible(true);

      }

    });

  }

             

  private javax.swing.JButton jButton1;

  private javax.swing.JTextField jTextField1;

  private javax.swing.JTextField jTextField2;

  private javax.swing.JTextField jTextField3;

  private javax.swing.JTextField jTextField4;

  private javax.swing.JTextField jTextField5;

  private javax.swing.JTextField jTextField6;

  private java.awt.Label label1;

  private java.awt.Label label2;

  private java.awt.Label label3;

  private java.awt.Label label4;

  private java.awt.Label label5;

  private java.awt.Label label6;

  private java.awt.Label label7;

         

}

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Answered by Expert Tutors 

import java.awt.event.ActionEvent;

import java.awt.event.ItemEvent;

import java.awt.event.ItemListener;

import javax.swing.ButtonGroup;

import javax.swing.DefaultComboBoxModel;

import javax.swing.JComboBox;

import javax.swing.JPanel;

import javax.swing.JRadioButton;

public class NewJFrame2 extends javax.swing.JFrame {

public NewJFrame2() {

initComponents();

}

@SuppressWarnings("unchecked")

private void initComponents() {

// Create the labels using Java Swing

label1 = new java.awt.Label();

label2 = new java.awt.Label();

label3 = new java.awt.Label();

label4 = new java.awt.Label();

label5 = new java.awt.Label();

label6 = new java.awt.Label();

jTextField1 = new javax.swing.JTextField();

jTextField2 = new javax.swing.JTextField();

jTextField3 = new javax.swing.JTextField();

jTextField4 = new javax.swing.JTextField();

jTextField5 = new javax.swing.JTextField();

jTextField6 = new javax.swing.JTextField();

jButton1 = new javax.swing.JButton();

label7 = new java.awt.Label();

labelCity = new java.awt.Label();

jComboBoxCity = new JComboBox<String>();

jRadioButtonCarCompany1 = new JRadioButton();

jRadioButtonCarCompany2 = new JRadioButton();

jRadioButtonCarCompany3 = new JRadioButton();

buttonGroupCarCompanies = new ButtonGroup();

jPanel = new JPanel();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

cities = new String[] { "New York", "New Jersey", "Denver", "San Jose", "Dallas" };

foodCosts = new int[] { 70, 80, 85, 90, 95 };

// assign label text and button listening event.

label1.setText("Traveler name ");

label2.setText("Airfare cost ");

label3.setText("Food cost ");

label4.setText("Car cost ");

label5.setText("Hotel cost ");

label6.setText("Shuttle cost ");

labelCity.setText("Location");

jButton1.setText("Calculation Total");

jRadioButtonCarCompany1.setText("Aon");

jRadioButtonCarCompany2.setText("Bon");

jRadioButtonCarCompany3.setText("Con");

buttonGroupCarCompanies.add(jRadioButtonCarCompany1);

buttonGroupCarCompanies.add(jRadioButtonCarCompany2);

buttonGroupCarCompanies.add(jRadioButtonCarCompany3);

jButton1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton1ActionPerformed(evt);

}

});

jComboBoxCity.addItemListener(new ItemListener() {

@Override

public void itemStateChanged(ItemEvent e) {

// TODO Auto-generated method stub

cmbCityActionPerformed(e);

}

});

// populate combo box

jComboBoxCity.setModel(new DefaultComboBoxModel<String>(cities));

// Item changed event is not triggered on populate

// hence manually firing it to ensure Food Textbox is populated with the

// corrresponding cost

jComboBoxCity.setSelectedIndex(1);

jComboBoxCity.setSelectedIndex(0);

// Create a layout for Label and Radio buttons in one panel. This will make it

// easy to just add the panel to our form

javax.swing.GroupLayout myl = new javax.swing.GroupLayout(jPanel);

myl.setAutoCreateGaps(true);

myl.setAutoCreateContainerGaps(true);

myl.setVerticalGroup(myl.createSequentialGroup().addComponent(label5).addComponent(jRadioButtonCarCompany1)

.addComponent(jRadioButtonCarCompany2).addComponent(jRadioButtonCarCompany3));

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

getContentPane().setLayout(layout);

layout.setHorizontalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addGap(123, 123, 123)

.addComponent(label7, javax.swing.GroupLayout.PREFERRED_SIZE, 409,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addGroup(layout.createSequentialGroup()

.addContainerGap()

.addGroup(layout

.createParallelGroup(javax.swing.GroupLayout.Alignment.CENTER)

.addComponent(label6, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(label1, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(label2, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

// replaced label5 with jPanel that holds the label together

// with radio buttons

.addComponent(jPanel, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(jButton1)

.addComponent(label3, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(labelCity, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(label4, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(179, 179, 179)

.addGroup(layout

.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jTextField1,

javax.swing.GroupLayout.PREFERRED_SIZE, 184,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addGroup(layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.TRAILING,

false)

.addComponent(jTextField6,

javax.swing.GroupLayout.Alignment.LEADING,

javax.swing.GroupLayout.DEFAULT_SIZE, 70,

Short.MAX_VALUE)

.addComponent(jTextField5,

javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jTextField4,

javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jTextField3,

javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jComboBoxCity,

javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jTextField2,

javax.swing.GroupLayout.Alignment.LEADING)))))

.addGap(179, 179, 179)

.addContainerGap(123, Short.MAX_VALUE))

);

layout.setVerticalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(label1, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(21, 21, 21)

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(label2, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(30, 30, 30)

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(label3, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(29, 29, 29)

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

// replaced label5 with jPanel that holds the label together with radio buttons

.addComponent(jPanel, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(26, 26, 26)

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(label4, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(23, 23, 23)

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(label6, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(23, 23, 23)

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(labelCity, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(jComboBoxCity, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(28, 28, 28)

.addComponent(jButton1)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 41,

Short.MAX_VALUE)

.addComponent(label7, javax.swing.GroupLayout.PREFERRED_SIZE, 121,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(19, 19, 19))

);

pack();

}

private void cmbCityActionPerformed(ItemEvent evt) {

int index = jComboBoxCity.getSelectedIndex();

int cost = foodCosts[index];

jTextField3.setText(String.valueOf(cost));

}

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

// Declare variables to hold data. Set total to equal data values held in

// arfare,food hotel, car and shuttle

String Travelername = jTextField1.getText();

double Airfarecost = Double.parseDouble(jTextField2.getText());

double Foodcost = Double.parseDouble(jTextField3.getText());

double Hotelcost = Double.parseDouble(jTextField4.getText());

double Carcost = Double.parseDouble(jTextField5.getText());

double Shuttlecost = Double.parseDouble(jTextField6.getText());

double total = Airfarecost + Foodcost + Hotelcost + Carcost + Shuttlecost;

// add ten percent of cost to total value by multiplying total by 0.1

total = total + total * 0.1;

label7.setText("The travel cost is " + total);

}

public static void main(String args[]) {

try {

for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {

if ("Nimbus".equals(info.getName())) {

javax.swing.UIManager.setLookAndFeel(info.getClassName());

break;

}

}

} catch (ClassNotFoundException ex) {

java.util.logging.Logger.getLogger(NewJFrame2.class.getName()).log(java.util.logging.Level.SEVERE, null,

ex);

} catch (InstantiationException ex) {

java.util.logging.Logger.getLogger(NewJFrame2.class.getName()).log(java.util.logging.Level.SEVERE, null,

ex);

} catch (IllegalAccessException ex) {

java.util.logging.Logger.getLogger(NewJFrame2.class.getName()).log(java.util.logging.Level.SEVERE, null,

ex);

} catch (javax.swing.UnsupportedLookAndFeelException ex) {

java.util.logging.Logger.getLogger(NewJFrame2.class.getName()).log(java.util.logging.Level.SEVERE, null,

ex);

}

java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

new NewJFrame2().setVisible(true);

}

});

}

private javax.swing.JButton jButton1;

private javax.swing.JTextField jTextField1;

private javax.swing.JTextField jTextField2;

private javax.swing.JTextField jTextField3;

private javax.swing.JTextField jTextField4;

private javax.swing.JTextField jTextField5;

private javax.swing.JTextField jTextField6;

private java.awt.Label label1;

private java.awt.Label label2;

private java.awt.Label label3;

private java.awt.Label label4;

private java.awt.Label label5;

private java.awt.Label label6;

private java.awt.Label label7;

private java.awt.Label labelCity;

private javax.swing.JComboBox<String> jComboBoxCity;

private javax.swing.JRadioButton jRadioButtonCarCompany1;

private javax.swing.JRadioButton jRadioButtonCarCompany2;

private javax.swing.JRadioButton jRadioButtonCarCompany3;

private javax.swing.ButtonGroup buttonGroupCarCompanies;

private javax.swing.JPanel jPanel;

private String[] cities;

private int[] foodCosts;

}

Step-by-step explanation

Here are the lines of code that

· Include a combo box for the locations with five cities of your choice.

jComboBoxCity = new JComboBox<String>();

// populate combo box

jComboBoxCity.setModel(new DefaultComboBoxModel<String>(cities));

// Item changed event is not triggered on populate

// hence manually firing it to ensure Food Textbox is populated with the

// corrresponding cost

jComboBoxCity.setSelectedIndex(1);

jComboBoxCity.setSelectedIndex(0);

· Modify the food field to make it automatically place a value in that field based on the location selected.

jComboBoxCity.addItemListener(new ItemListener() {

@Override

public void itemStateChanged(ItemEvent e) {

cmbCityActionPerformed(e);

}

});

private void cmbCityActionPerformed(ItemEvent evt) {

int index = jComboBoxCity.getSelectedIndex();

int cost = foodCosts[index];

jTextField3.setText(String.valueOf(cost));

}

· The values for the food field will be 70 when the first location is selected, 80 when the second location is selected.

· The food values will then increase by 5 for the remaining locations when selected.

//The event listener takes care of finding the city index and using that index to extract the value of food cost

cities = new String[] { "New York", "New Jersey", "Denver", "San Jose", "Dallas" };

//the corresponding cost is stored as per the index of the city

foodCosts = new int[] { 70, 80, 85, 90, 95 };

· Add to the car field to allow for three rental car companies to select from using a radio button.

· The value for the cost of the rental car will remain as a text field.

// Create a layout for Label and Radio buttons in one panel. This will make it

// easy to just add the panel to our form

javax.swing.GroupLayout myl = new javax.swing.GroupLayout(jPanel);

myl.setAutoCreateGaps(true);

myl.setAutoCreateContainerGaps(true);

myl.setVerticalGroup(myl.createSequentialGroup().addComponent(label5).addComponent(jRadioButtonCarCompany1)

.addComponent(jRadioButtonCarCompany2).addComponent(jRadioButtonCarCompany3));

In the horizontal layout code

// replaced label5 with jPanel that holds the label together

// with radio buttons

.addComponent(jPanel, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

In the vertical layout code

// replaced label5 with jPanel that holds the label together with radio buttons

.addComponent(jPanel, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)