I have this problem in my class:

Create a simple GUI application that will obtain from a user their birth date. The program will then calculate and display the age of the user within a JPanel when the user clicks on a button. The GUI should display the value presented. Ensure that your application includes the following components:

JPanel

JButton

ActionListener

Submit screenshots of your programs execution and output. Include all appropriate source code in a zip file.

This is the code I came up with. I'm wondering if this is correct/what I need to fix with it and why:

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class BirthdayFrame extends JFrame {

private JButton button;

private JLabel ageLabel;

private JLabel monthLabel;

private JLabel dayLabel;

private JLabel yearLabel;

private JTextField monthField;

private JTextField dayField;

private JTextField yearField;

private double age;

private static final int FRAME_WIDTH = 500;

private static final int FRAME_HEIGHT = 500;

private static final double TODAYS_MONTH = 7;

private static final double TODAYS_DAY = 11;

private static final double TODAYS_YEAR = 2018; 

}

public BirthdayFrame() {

double userAge = age;

createTextFields();

createButton();

createPanel();

setSize(FRAME_WIDTH, FRAME_HEIGHT);

}

Private void createTextFields() {

monthLabel = new JLabel(Birth Month (Number): );

final int FIELD_WIDTH = 2;

monthField = new JTextField(FIELD_WIDTH);

monthField.setEditable(true);

monthField.setText(userMonth);

dayLabel = new JLabel(Birth Day: );

dayField = new JTextField(FIELD_WIDTH);

dayField.setEditable(true);

dayField.setText(userDay);

yearLabel = new JLabel(Birth Year: );

final int YEAR_WIDTH = 4;

yearField = new JTextField(YEAR_WIDTH);

yearField.setEditable(true);

yearField.setText(userYear);

class CalculateBirthdayListener implements ActionListener {

public void actionPerformed(ActionEvent event) {

int userMonth = 0;

int userDay = 0;

int userYear = 0;

userMonth = yearField.getValue();

userDay = dayField.getValue();

userYear = yearField.getValue();

if (userMonth < todaysMonth) {

userAge = todaysYear userYear;

}

else if ((userMonth = todaysMonth) && (userDay < todaysDay)) {

userAge = todaysYear userYear;

}

else {

userAge = (todaysYear userYear) 1;

}

ageLabel.setText(Age: + userAge);

}

}

private void createButton() {

button = new JButton(Calculate Birthday);

ActionListener listener = new CalculateBirthdayListener();

button.addActionListener(listener);

private void createPanel() {

JPanel panel == new JPanel();

panel.add(monthLabel);

panel.add(monthField);

panel.add(dayLabel);

panel.add(dayField);

panel.add(yearLabel);

panel.add(yearField);

panel.add(button);

panel.add(ageLabel);

add(panel);

}

}

import javax.swing.JFrame;

public class BirthdayViewer {

public static void main(String[] args) {

JFrame frame = new BirthdayFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

}