Passport Code

////////////////////////////////////////////////////////////////////////////////////////////
//	Author: Jonathan McRae
//	Date: 02-02-16
//
//	Name: PassportFrame
//	Summary:
//
////////////////////////////////////////////////////////////////////////////////////////////

package Program2_Passport;

import java.awt.Component;
import java.awt.Dimension;
import java.awt.Color;
import java.awt.event.*;
import javax.swing.*;

public class PassportFrame extends JFrame
{
	// initializes GUI elements
	private JFrame frame;
	private PassportPanel panel;

	// creates GUI
	public PassportFrame()
	{
		// sets up the frame
		frame = new JFrame ("Passport Application");
		frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);

		// adds the content to the frame
		frame.getContentPane().add (panel);
	}


	// displays the frame
	public void display()
	{
		frame.pack();
		frame.setVisible(true);
	}
}


////////////////////////////////////////////////////////////////////////////////////////////
//	Author: Jonathan McRae
//	Date: 02-02-16
//
//	Name: PassportPanel
//	Summary:
//
////////////////////////////////////////////////////////////////////////////////////////////

package Program2_Passport;

import java.awt.Dimension;
import java.awt.Color;
import java.awt.event.*;

import javax.swing.*;

import java.util.Random;

public class PassportPanel extends JPanel
{
	// initializes the random number
	private static Random randGen;

	// initializes the variable for the id number and (random) photo number
	private int idNumber;
	private int photoNumber;

	// initializes the GUI elements
	private JPanel panel;
	private JButton submitButton;
	private JButton newApplicant;
	private JLabel photo = new JLabel();
	private JLabel guiFirstName;
	private JLabel guiLastName;
	private JLabel guiIDNumber;
	private JTextField firstNameJTF = new JTextField(100);
	private JTextField lastNameJTF = new JTextField(100);

	public PassportPanel()
	{
		// sets up the random number generator
		randGen = new Random();

		// sets up the submit button
		submitButton = new JButton ("Submit");
		submitButton.addActionListener (new SubmitListener());

		// sets up the new applicant button
		newApplicant = new JButton ("New Applicant");
		newApplicant.addActionListener(new ApplicantListener());

		//sets up the labels
		photo.setIcon(new ImageIcon("/images/a1.jpg"));
		guiFirstName = new JLabel("First Name");
		guiLastName = new JLabel("Last Name");
		guiIDNumber = new JLabel("Identification Number");

		// sets up the rest of the text fields
		firstNameJTF.addActionListener(new NameListener());
		lastNameJTF.addActionListener(new NameListener());

		// sets up the panel
		panel = new JPanel();
		panel.setPreferredSize (new Dimension(800,800));
		panel.setBackground(Color.GRAY);
		panel.add(photo);
		panel.add(guiFirstName);
		panel.add(guiLastName);
		panel.add(guiIDNumber);
		panel.add(submitButton);
	}

	// listener for the submit button ('enters' the passport applicant)
	private class SubmitListener implements ActionListener
	{
		public void actionPerformed(ActionEvent event)
		{
			// randomly generates a number to pick a random photo from the image library
			photoNumber = randGen.nextInt((8)+1);
			photo.setIcon(new ImageIcon("/images/a" + photoNumber +".jpeg"));

			// randomly generates the id number, converts to string, formats it, and sets the label
			idNumber = randGen.nextInt((999999999)+1);
			String idString = Integer.toString(idNumber);
			idString.format("%09");
			guiIDNumber.setText(idString);
		}
	}

	// listener for the new applicant button (prepares for new applicant)
	private class ApplicantListener implements ActionListener
	{
		// clears the text fields, id number, and photo to prepare for a new applicant entry
		public void actionPerformed(ActionEvent event)
		{
			photo.setText("");	guiIDNumber.setText("");	guiFirstName.setText("");	guiLastName.setText("");
		}
	}

	// listener for the name text fields
	private class NameListener implements ActionListener
	{
		// sets up the text field and sets the label to the input of the first name field
		public void actionPerformed(ActionEvent e)
		{
			String input = firstNameJTF.getText();
			guiFirstName.setText(input);
		}

		// sets up the text field and sets the label to the input of the last name field
		public void actionPerformed1(ActionEvent f)
		{
			String input = lastNameJTF.getText();
			guiLastName.setText(input);
		}
	}
}

////////////////////////////////////////////////////////////////////////////////////////////
//	Author: Jonathan McRae
//	Date: 02-02-16
//
//	Name: PassportUser
//	Summary:
//
////////////////////////////////////////////////////////////////////////////////////////////

package Program2_Passport;
import java.text.DecimalFormat;
import java.util.Random;

public class PassportUser
{
	public static void main (String[] args)
	{
		PassportFrame newPassportFrame = new PassportFrame();
		newPassportFrame.display();
	}
}


Exception in thread "main" java.lang.NullPointerException
	at java.awt.Container.addImpl(Unknown Source)
	at java.awt.Container.add(Unknown Source)
	at Program2_Passport.PassportFrame.<init>(PassportFrame.java:34)
	at Program2_Passport.PassportUser.main(PassportUser.java:18)