I need this code to be fixed. It compiles, but it does not display the GUI appli

Question

I need this code to be fixed. It compiles, but it does not display the GUI application or anything.

import java.awt.*;

import java.awt.event.*;

import java.text.DecimalFormat;

import javax.swing.*;

public class TravelExpenses extends JFrame

{

private JPanel travelInfoPanel;

private JPanel buttonPanel;

private JLabel numDaysOnTripLabel;

private JLabel amountAirfairLabel;

private JLabel amountCarRentalLabel;

private JLabel milesDrivenLabel;

private JLabel parkingFeesLabel;

private JLabel taxiFeesLabel;

private JLabel confRegLabel;

private JLabel lodgingChargesPerNightLabel;

private JTextField numDaysOnTripTextField;

private JTextField amountAirfairTextField;

private JTextField amountCarRentalTextField;

private JTextField milesDrivenTextField;

private JTextField parkingFeesTextField;

private JTextField taxiFeesTextField;

private JTextField confRegTextField;

private JTextField lodgingChargesPerNightTextField;

private JButton resetButton;

private JButton calcButton;

private double mealsAmount = 37.00;

private double parkingFeesReimbursed = 10.00;

private double taxiChargesReimbursed = 20.00;

private double lodgingChargesReimbursed = 95.00;

private double prVehiclePerMileReimbursed = 0.27;

/**

*

*/

public String TravelExpenses()

{

setTitle("Travel Expenses");

setLocationRelativeTo(null);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setLayout(new BorderLayout());

buildTravelInfoPanel();

buildButtonPanel();

add(travelInfoPanel, BorderLayout.CENTER);

add(buttonPanel, BorderLayout.SOUTH);

pack();

setVisible(true);

return null;

}

private void buildTravelInfoPanel()

{

numDaysOnTripLabel = new JLabel("Number of days on trip: ");

amountAirfairLabel = new JLabel("Amount of airfair: ");

amountCarRentalLabel = new JLabel("Amount of car rental fees: ");

milesDrivenLabel = new JLabel("Number of miles driven: ");

parkingFeesLabel = new JLabel ("Amount of parking fees: ");

taxiFeesLabel = new JLabel ("Amountt of taxi charges: ");

confRegLabel = new JLabel("Conference or seminar registration fees: ");

lodgingChargesPerNightLabel = new JLabel("Lodging charges per night: ");

numDaysOnTripTextField = new JTextField(3);

amountAirfairTextField = new JTextField(8);

amountCarRentalTextField = new JTextField(8);

milesDrivenTextField = new JTextField(4);

parkingFeesTextField = new JTextField(6);

taxiFeesTextField = new JTextField(6);

confRegTextField = new JTextField(8);

lodgingChargesPerNightTextField = new JTextField(6);

travelInfoPanel = new JPanel();

travelInfoPanel.setLayout(new GridLayout(10,2));

travelInfoPanel.add(numDaysOnTripLabel);

travelInfoPanel.add(numDaysOnTripTextField);

travelInfoPanel.add(amountAirfairLabel);

travelInfoPanel.add(amountAirfairTextField);

travelInfoPanel.add(amountCarRentalLabel);

travelInfoPanel.add(amountCarRentalTextField);

travelInfoPanel.add(milesDrivenLabel);

travelInfoPanel.add(milesDrivenTextField);

travelInfoPanel.add(parkingFeesLabel);

travelInfoPanel.add(parkingFeesTextField);

travelInfoPanel.add(taxiFeesLabel);

travelInfoPanel.add(taxiFeesTextField);

travelInfoPanel.add(confRegLabel);

travelInfoPanel.add(confRegTextField);

travelInfoPanel.add(lodgingChargesPerNightLabel);

travelInfoPanel.add(lodgingChargesPerNightTextField);

travelInfoPanel.setBorder(BorderFactory.createEmptyBorder(10,10,1,10));

}

private void buildButtonPanel()

{

calcButton = new JButton("Calculate");

calcButton.addActionListener(new CalcButtonListener());

resetButton = new JButton("Reset");

buttonPanel = new JPanel();

buttonPanel.setLayout(new BorderLayout(5,5));

buttonPanel.add(resetButton, BorderLayout.WEST);

buttonPanel.add(calcButton, BorderLayout.CENTER);

buttonPanel.setBorder(BorderFactory.createEmptyBorder(1,10,10,10));

}

private static class TravelExpenses

{

public TravelExpenses()

{

}

}

private class CalcButtonListener implements ActionListener

{

String input;

int days;

double air,carRental,miles,parking,taxi,confReg,lodging,mealsAmount;

public void actionPerformed(ActionEvent e)

{

double actualExpenses, milesExpenses, allowableExpenses, excessAir,

excessCarRental, excessParking, excessTaxi,excessLodging,

excessAmountTotal;

double amountSaved = 0;

double paidBackAmount = 0;

DecimalFormat dollar = new DecimalFormat("$#,##0.00");

days = Integer.parseInt(numDaysOnTripTextField.getText());

air = Double.parseDouble(amountAirfairTextField.getText());

carRental = Double.parseDouble(amountCarRentalTextField.getText());

miles = Double.parseDouble(milesDrivenTextField.getText());

parking = Double.parseDouble(parkingFeesTextField.getText());

taxi = Double.parseDouble(taxiFeesTextField.getText());

confReg = Double.parseDouble(confRegTextField.getText());

lodging = Double.parseDouble(lodgingChargesPerNightTextField.getText());

milesExpenses = miles * prVehiclePerMileReimbursed;

actualExpenses = (carRental + parking + taxi + lodging + mealsAmount)

* days + air + milesExpenses + confReg;

allowableExpenses =

(mealsAmount+parkingFeesReimbursed+taxiChargesReimbursed+

lodgingChargesReimbursed)*days+milesExpenses+air+confReg;

if(actualExpenses > allowableExpenses)

paidBackAmount = actualExpenses - allowableExpenses;

else

amountSaved = allowableExpenses - actualExpenses;

if(paidBackAmount > 0)

JOptionPane.showMessageDialog(null,"Total Expenses: "

+ dollar.format(actualExpenses) + " " +

"Allowable expenses: " + dollar.format(allowableExpenses)

+ " " + "Amount to be paid back: " +

dollar.format(paidBackAmount));

else if (amountSaved > 0)

JOptionPane.showMessageDialog(null, "Total expenses: "

+ dollar.format(actualExpenses) + " " + "Allowable "

+ "expenses: " + dollar.format(allowableExpenses)+

" " + "Amount Saved: " + dollar.format(amountSaved));

else

JOptionPane.showMessageDialog(null, "Total expenses: "

+ dollar.format(actualExpenses) + " " + "Allowable "

+ "expenses: " + dollar.format(allowableExpenses)+

" ");

}

}

private class ResetButtonListener implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

numDaysOnTripTextField.setText("");

amountAirfairTextField.setText("");

amountCarRentalTextField.setText("");

milesDrivenTextField.setText("");

parkingFeesTextField.setText("");

taxiFeesTextField.setText("");

confRegTextField.setText("");

lodgingChargesPerNightTextField.setText("");

}

}

public static void main(String[] args)

{

new TravelExpenses();

}

}

Explanation / Answer

Fixed !! Check my comment

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