Develop Reference

GUI goes blank when i try to define the public void actionPerformed(ActionEvent arg0)

When I try to add some function to get data from jtext field under public void actionPerformed(ActionEvent arg0) My GUI goes blank I have attached the images below I can't figure out what's wrong with it.
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class Register extends JFrame {
private JPanel contentPane;
private JTextField textField;
private JTextField textField_1;
private JTextField textField_2;
private JTextField textField_3;
private JTextField textField_4;
private JLabel lblNewLabel;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Register frame = new Register();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public Register() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lblName = new JLabel("Name");
lblName.setBounds(56, 56, 56, 16);
contentPane.add(lblName);
JLabel lblUsername = new JLabel("Username");
lblUsername.setBounds(56, 85, 77, 16);
contentPane.add(lblUsername);
JLabel lblPassword = new JLabel("Password");
lblPassword.setBounds(56, 114, 56, 16);
contentPane.add(lblPassword);
JLabel lblAge = new JLabel("Age");
lblAge.setBounds(56, 143, 56, 16);
contentPane.add(lblAge);
JLabel lblGender = new JLabel("Gender");
lblGender.setBounds(56, 172, 56, 16);
contentPane.add(lblGender);
textField = new JTextField();
textField.setBounds(130, 53, 116, 19);
contentPane.add(textField);
textField.setColumns(10);
textField_1 = new JTextField();
textField_1.setBounds(130, 82, 116, 22);
contentPane.add(textField_1);
textField_1.setColumns(10);
textField_2 = new JTextField();
textField_2.setBounds(130, 111, 116, 22);
contentPane.add(textField_2);
textField_2.setColumns(10);
textField_3 = new JTextField();
textField_3.setBounds(130, 140, 116, 22);
contentPane.add(textField_3);
textField_3.setColumns(10);
textField_4 = new JTextField();
textField_4.setBounds(130, 169, 116, 22);
contentPane.add(textField_4);
textField_4.setColumns(10);
JButton btnSubmit = new JButton("Submit");
btnSubmit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
}
});
btnSubmit.setBounds(169, 215, 97, 25);
contentPane.add(btnSubmit);
lblNewLabel = new JLabel("New label");
lblNewLabel.setBounds(330, 56, 56, 16);
contentPane.add(lblNewLabel);
}
}
EDIT 1: Added String name to action just to get name.
JButton btnSubmit = new JButton("Submit");
btnSubmit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String Name;
}
});
and This happened
GUI went blank:

You're using an absolute layout. Since you can't pack() the window, you need to at least validate() its contents.
Register frame = new Register();
frame.validate();
frame.setVisible(true);
Now you can see the real problem: you picked bounds for lblPassword and lblNewLabel that cut off the text on my computer. You really need to use a layout, maybe like this.

Transferring of data from one JPanel to another

I am curious to ask that is it possible to transfer a data from one JPanel to another. I'm currently doing a swing java project which has a profile page and a profile edit page. I wanted to try out creating a method to get the text in a textfield in the profile edit page and then return the textfield.getText();. Then I will follow by calling the exact method from the profile page and setting it as a JLabel. However, I wasn't sure how to do this...
I updated the codes below.
Here is the Profile Edit Page:
package Project;
import java.awt.Color;
import java.awt.Font;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.border.LineBorder;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class ProfileEdit extends MasterPanel {
private JTextField txtbxFullName;
private JTextField txtAdmissionNo;
private JTextField txtbxContactNo;
private JTextField txtFieldDiploma;
/**
* Create the panel.
*/
public ProfileEdit(JFrame mf) {
super(mf);
JLabel lblUserProfile = new JLabel("");
lblUserProfile.setBorder(BorderFactory.createTitledBorder(null,"User Profile",0,0, new Font("Tahoma", Font.PLAIN, 15), Color.WHITE));
lblUserProfile.setForeground(Color.WHITE);
lblUserProfile.setFont(new Font("Tahoma", Font.PLAIN, 15));
lblUserProfile.setBounds(60, 103, 514, 297);
add(lblUserProfile);
JLabel lblDisplayPic = new JLabel("");
lblDisplayPic.setBorder(new LineBorder(Color.WHITE));
lblDisplayPic.setIcon(new ImageIcon(ProfileEdit.class.getResource("/javaProject/images/default-avatar.png")));
lblDisplayPic.setBounds(100, 132, 90, 100);
add(lblDisplayPic);
JLabel lblFullName = new JLabel("Full Name:");
lblFullName.setForeground(Color.WHITE);
lblFullName.setFont(new Font("Tahoma", Font.PLAIN, 13));
lblFullName.setBounds(235, 132, 76, 14);
add(lblFullName);
JLabel lblGender = new JLabel("Gender: ");
lblGender.setForeground(Color.WHITE);
lblGender.setFont(new Font("Tahoma", Font.PLAIN, 13));
lblGender.setBounds(235, 168, 60, 14);
add(lblGender);
JRadioButton rdbtnMale = new JRadioButton("Male");
rdbtnMale.setBackground(Color.DARK_GRAY);
rdbtnMale.setFont(new Font("Tahoma", Font.PLAIN, 13));
rdbtnMale.setForeground(Color.WHITE);
rdbtnMale.setBounds(326, 164, 68, 23);
add(rdbtnMale);
JRadioButton rdbtnFemale = new JRadioButton("Female");
rdbtnFemale.setBackground(Color.DARK_GRAY);
rdbtnFemale.setFont(new Font("Tahoma", Font.PLAIN, 13));
rdbtnFemale.setForeground(Color.WHITE);
rdbtnFemale.setBounds(396, 164, 77, 23);
add(rdbtnFemale);
ButtonGroup genderRdBtn = new ButtonGroup();
genderRdBtn.add(rdbtnFemale);
genderRdBtn.add(rdbtnMale);
JLabel lblAdmissionNo = new JLabel("Admission No:");
lblAdmissionNo.setForeground(Color.WHITE);
lblAdmissionNo.setFont(new Font("Tahoma", Font.PLAIN, 13));
lblAdmissionNo.setBounds(235, 203, 97, 14);
add(lblAdmissionNo);
JLabel lblContactNo = new JLabel("Contact No:");
lblContactNo.setForeground(Color.WHITE);
lblContactNo.setFont(new Font("Tahoma", Font.PLAIN, 13));
lblContactNo.setBounds(235, 240, 77, 14);
add(lblContactNo);
JLabel lblDiploma = new JLabel("Diploma In:");
lblDiploma.setForeground(Color.WHITE);
lblDiploma.setFont(new Font("Tahoma", Font.PLAIN, 13));
lblDiploma.setBounds(235, 275, 76, 14);
add(lblDiploma);
txtbxFullName = new JTextField();
txtbxFullName.setBounds(326, 130, 147, 20);
add(txtbxFullName);
txtbxFullName.setColumns(10);
txtAdmissionNo = new JTextField();
txtAdmissionNo.setBounds(326, 201, 147, 20);
add(txtAdmissionNo);
txtAdmissionNo.setColumns(10);
txtbxContactNo = new JTextField();
txtbxContactNo.setBounds(326, 238, 147, 20);
add(txtbxContactNo);
txtbxContactNo.setColumns(10);
txtFieldDiploma = new JTextField();
txtFieldDiploma.setBounds(326, 273, 147, 20);
add(txtFieldDiploma);
txtFieldDiploma.setColumns(10);
JButton btnSubmit = new JButton("SUBMIT");
btnSubmit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Home home = new Home(mf);
mf.setContentPane(home);
mf.setVisible(true);
}
});
btnSubmit.setBounds(235, 336, 114, 23);
add(btnSubmit);
JButton btnCancel = new JButton("CANCEL");
btnCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Home home = new Home(mf);
mf.setContentPane(home);
mf.setVisible(true);
}
});
btnCancel.setBounds(359, 336, 114, 23);
add(btnCancel);
JButton btnBrowse = new JButton("Browse");
btnBrowse.setBounds(101, 247, 89, 23);
add(btnBrowse);
}
}
Here is the Profile Page :
package Project;
import java.awt.Color;
import Project.ProfileEdit;
import java.awt.Font;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.border.LineBorder;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import Project.ProfileEdit;
public class Home extends MasterPanel {
/**
* Create the panel.
*/
public Home(JFrame mf) {
super(mf);
JLabel lblUserProfile = new JLabel("");
//createTitledBorder(border, string, int, int, font, color)
lblUserProfile.setBorder(BorderFactory.createTitledBorder(null,"User Profile",0,0, new Font("Tahoma", Font.PLAIN, 15), Color.WHITE));
//setBounds(left, top, right, bottom)
lblUserProfile.setBounds(60, 103, 510, 267);
add(lblUserProfile);
JLabel lblDisplayPic = new JLabel("");
lblDisplayPic.setBorder(new LineBorder(Color.WHITE));
lblDisplayPic.setIcon(new ImageIcon(Home.class.getResource("/javaProject/images/default-avatar.png")));
lblDisplayPic.setBounds(108, 142, 90, 100);
add(lblDisplayPic);
JLabel lblFullName = new JLabel("Full Name:");
lblFullName.setForeground(Color.WHITE);
lblFullName.setFont(new Font("Tahoma", Font.PLAIN, 13));
lblFullName.setBounds(251, 131, 76, 14);
add(lblFullName);
JLabel lblGender = new JLabel("Gender: ");
lblGender.setForeground(Color.WHITE);
lblGender.setFont(new Font("Tahoma", Font.PLAIN, 13));
lblGender.setBounds(251, 151, 60, 14);
add(lblGender);
JLabel lblAdmissionNo = new JLabel("Admission No:");
lblAdmissionNo.setForeground(Color.WHITE);
lblAdmissionNo.setFont(new Font("Tahoma", Font.PLAIN, 13));
lblAdmissionNo.setBounds(251, 176, 97, 14);
add(lblAdmissionNo);
JLabel lblContactNo = new JLabel("Contact No:");
lblContactNo.setForeground(Color.WHITE);
lblContactNo.setFont(new Font("Tahoma", Font.PLAIN, 13));
lblContactNo.setBounds(251, 195, 77, 14);
add(lblContactNo);
JLabel lblDiploma = new JLabel("Diploma In:");
lblDiploma.setForeground(Color.WHITE);
lblDiploma.setFont(new Font("Tahoma", Font.PLAIN, 13));
lblDiploma.setBounds(251, 218, 76, 14);
add(lblDiploma);
JButton btnEdit = new JButton("Edit ");
btnEdit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
ProfileEdit ProfileEdit = new ProfileEdit(mf);
mf.setContentPane(ProfileEdit);
mf.setVisible(true);
}
});
btnEdit.setBounds(251, 309, 89, 23);
add(btnEdit);
}
}
and Lastly, here is the Master Panel if you guys need it :
package Project;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import java.awt.Color;
import javax.swing.JSeparator;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.FlowLayout;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JLabel;
import javax.swing.BoxLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class MasterPanel extends JPanel {
/**
*
*/
private static final long serialVersionUID = 1L;
protected JFrame myFrame = null;
/**
* Create the panel.
*/
public MasterPanel(JFrame mf) {
myFrame = mf;
setBackground(Color.DARK_GRAY);
setLayout(null);
//set a new menubar for home
JMenuBar menuBarHome = new JMenuBar();
menuBarHome.setForeground(Color.BLACK);
menuBarHome.setBackground(Color.WHITE);
// x,y,width,height
// >x = right, <x = left
// >y = bottom, <y = up
menuBarHome.setBounds(80, 40, 97, 21);
//length and height
menuBarHome.setSize(48, 20);
add(menuBarHome);
JMenu home = new JMenu("HOME");
home.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent arg0) {
Home home = new Home(mf);
mf.setContentPane(home);
mf.setVisible(true);
}
});
menuBarHome.add(home);
//set a new menubar for calendar
JMenuBar menuBarCalendar = new JMenuBar();
menuBarCalendar.setForeground(Color.BLACK);
menuBarCalendar.setBackground(Color.WHITE);
menuBarCalendar.setBounds(145, 40, 97, 21);
menuBarCalendar.setSize(75, 20);
add(menuBarCalendar);
JMenu calendar = new JMenu("CALENDAR");
calendar.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
Calendar calendar = new Calendar(mf);
mf.setContentPane(calendar);
mf.setVisible(true);
}
});
menuBarCalendar.add(calendar);
JMenuBar menuBarAcademic = new JMenuBar();
menuBarAcademic.setForeground(Color.BLACK);
menuBarAcademic.setBackground(Color.WHITE);
menuBarAcademic.setBounds(235, 40, 220, 21);
menuBarAcademic.setSize(72, 20);
add(menuBarAcademic);
JMenu academic = new JMenu("ACADEMIC");
menuBarAcademic.add(academic);
//add sub menu into the academic
JMenuItem lectureNotes = new JMenuItem("Lecture Notes");
lectureNotes.setForeground(Color.BLACK);
lectureNotes.setBackground(Color.WHITE);
lectureNotes.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
LectureNotes LectureNotes = new LectureNotes(mf);
mf.setContentPane(LectureNotes);
mf.setVisible(true);
}
});
academic.add(lectureNotes);
JMenuItem resulttracker = new JMenuItem("Result Tracker");
resulttracker.setForeground(Color.BLACK);
resulttracker.setBackground(Color.WHITE);
resulttracker.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
ResultTracker resulttracker = new ResultTracker(mf);
mf.setContentPane(resulttracker);
mf.setVisible(true);
}
});
academic.add(resulttracker);
JMenuItem studyplan = new JMenuItem("Study Planner");
studyplan.setForeground(Color.BLACK);
studyplan.setBackground(Color.WHITE);
studyplan.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
StudyPlanner studyplanner = new StudyPlanner(mf);
mf.setContentPane(studyplanner);
mf.setVisible(true);
}
});
academic.add(studyplan);
JMenuItem timetable = new JMenuItem("Timetable");
timetable.setForeground(Color.BLACK);
timetable.setBackground(Color.WHITE);
timetable.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
TimeTable timetable = new TimeTable(mf);
mf.setContentPane(timetable);
mf.setVisible(true);
}
});
academic.add(timetable);
JMenuBar menuBarEmail = new JMenuBar();
menuBarEmail.setForeground(Color.BLACK);
menuBarEmail.setBackground(Color.WHITE);
menuBarEmail.setBounds(320, 40, 97, 21);
menuBarEmail.setSize(47, 20);
add(menuBarEmail);
JMenu email = new JMenu("EMAIL");
menuBarEmail.add(email);
JMenuItem composeemail = new JMenuItem("Compose");
composeemail.setForeground(Color.BLACK);
composeemail.setBackground(Color.WHITE);
composeemail.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
Email email = new Email(mf);
mf.setContentPane(email);
mf.setVisible(true);
}
});
email.add(composeemail);
JMenuItem inboxemail = new JMenuItem("Inbox");
inboxemail.setForeground(Color.BLACK);
inboxemail.setBackground(Color.WHITE);
email.add(inboxemail);
JMenuBar menuBarContactus = new JMenuBar();
menuBarContactus.setForeground(Color.BLACK);
menuBarContactus.setBackground(Color.WHITE);
menuBarContactus.setBounds(380, 40, 97, 21);
menuBarContactus.setSize(85, 20);
add(menuBarContactus);
JMenu contactus= new JMenu("CONTACT US");
contactus.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
ContactUs contactus = new ContactUs(mf);
mf.setContentPane(contactus);
mf.setVisible(true);
}
});
menuBarContactus.add(contactus);
JMenuBar menuBarLogout = new JMenuBar();
menuBarLogout.setForeground(Color.BLACK);
menuBarLogout.setBackground(Color.WHITE);
menuBarLogout.setBounds(480, 40, 97, 21);
menuBarLogout.setSize(60, 20);
add(menuBarLogout);
JMenu logout = new JMenu("LOGOUT");
logout.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
Login login = new Login(mf);
mf.setContentPane(login);
mf.setVisible(true);
}
});
menuBarLogout.add(logout);
JSeparator separatorTop = new JSeparator();
separatorTop.setBounds(50, 23, 524, 2);
add(separatorTop);
JSeparator separatorBottom = new JSeparator();
separatorBottom.setBounds(50, 79, 524, 2);
add(separatorBottom);
}
}

Syntax Error insert "}" to complete class block

I am making a program for my friend. I ran into an error while trying to create a write and save text into a .txt file. I should note this is the first time I have ever created something in Java Swing.
The error is marked with an asterisk.
package com.laganstoop.me;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Scanner;
import java.awt.event.ActionEvent;
import java.awt.Color;
import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.Font;
import javax.swing.JTextField;
import javax.swing.JCheckBox;
// Created by: Laganstoop (David L. Perez)
// Do Not Distribute!
public class Main implements ActionListener {
private JFrame frame;
public static String infoBox(String infoMessage, String titleBar)
{
JOptionPane.showMessageDialog(null, infoMessage, "" + titleBar, JOptionPane.INFORMATION_MESSAGE);
return "";
}
public static void errorMessage(String errorMessage, String titleBar)
{
JOptionPane.showMessageDialog(null, errorMessage, "" + titleBar, JOptionPane.INFORMATION_MESSAGE);
}
public static final int HEIGHT = 800;
public static final int WIDTH = 600;
public static final int nHEIGHT = 400;
public static final int nWIDTH = 300;
private JTextField textField;
private JTextField textField_1;
private JTextField textField_2;
private JTextField textField_3;
private JTextField textField_4;
private JTextField textField_5;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Main window = new Main();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public Main() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.getContentPane().setBackground(Color.LIGHT_GRAY);
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(HEIGHT, WIDTH);
JButton btnNewButton = new JButton("Click To Add New");
btnNewButton.setBounds(10, 11, 132, 23);
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException e1) {
e1.printStackTrace();
} catch (InstantiationException e1) {
e1.printStackTrace();
} catch (IllegalAccessException e1) {
e1.printStackTrace();
} catch (UnsupportedLookAndFeelException e1) {
e1.printStackTrace();
}
frame.getContentPane().setLayout(null);
frame.getContentPane().add(btnNewButton);
JPanel panel = new JPanel();
panel.setBounds(10, 11, 764, 181);
panel.setBackground(Color.WHITE);
panel.setForeground(Color.WHITE);
frame.getContentPane().add(panel);
panel.setLayout(null);
panel.hide();
JLabel lblName = new JLabel("Name:");
lblName.setFont(new Font("Yu Gothic", Font.BOLD, 13));
lblName.setBounds(10, 11, 46, 14);
panel.add(lblName);
JLabel lblDate = new JLabel("Date:");
lblDate.setFont(new Font("Yu Gothic", Font.BOLD, 13));
lblDate.setBounds(10, 36, 46, 14);
panel.add(lblDate);
JLabel lblLocation = new JLabel("Time:\r\n");
lblLocation.setFont(new Font("Yu Gothic", Font.BOLD, 13));
lblLocation.setBounds(10, 61, 60, 14);
panel.add(lblLocation);
JLabel lblLocation_1 = new JLabel("Location:");
lblLocation_1.setFont(new Font("Yu Gothic", Font.BOLD, 13));
lblLocation_1.setBounds(10, 86, 60, 14);
panel.add(lblLocation_1);
JLabel lblRe = new JLabel("Referee");
lblRe.setFont(new Font("Yu Gothic", Font.BOLD, 13));
lblRe.setBounds(10, 111, 60, 14);
panel.add(lblRe);
textField = new JTextField();
textField.setBounds(76, 8, 127, 20);
panel.add(textField);
textField.setColumns(10);
textField_1 = new JTextField();
textField_1.setColumns(10);
textField_1.setBounds(76, 33, 127, 20);
panel.add(textField_1);
textField_2 = new JTextField();
textField_2.setColumns(10);
textField_2.setBounds(76, 58, 127, 20);
panel.add(textField_2);
textField_3 = new JTextField();
textField_3.setColumns(10);
textField_3.setBounds(76, 86, 127, 20);
panel.add(textField_3);
textField_4 = new JTextField();
textField_4.setColumns(10);
textField_4.setBounds(76, 108, 127, 20);
panel.add(textField_4);
JCheckBox checkBox = new JCheckBox("");
checkBox.setBounds(209, 7, 21, 23);
panel.add(checkBox);
JCheckBox checkBox_1 = new JCheckBox("");
checkBox_1.setBounds(209, 32, 21, 23);
panel.add(checkBox_1);
JCheckBox checkBox_2 = new JCheckBox("");
checkBox_2.setBounds(209, 57, 21, 23);
panel.add(checkBox_2);
JCheckBox checkBox_3 = new JCheckBox("");
checkBox_3.setBounds(209, 82, 21, 23);
panel.add(checkBox_3);
JCheckBox checkBox_4 = new JCheckBox("");
checkBox_4.setBounds(209, 107, 21, 23);
panel.add(checkBox_4);
JPanel panel_2 = new JPanel();
panel_2.setBounds(20, 290, 358, 210);
panel_2.setLayout(null);
JButton btnNewNote = new JButton("New Note");
btnNewNote.setFont(new Font("Yu Gothic", Font.BOLD, 16));
btnNewNote.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JFrame noteFrame = new JFrame();
noteFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
noteFrame.setLocationRelativeTo(panel);
noteFrame.pack();
noteFrame.setSize(nHEIGHT, nWIDTH);
noteFrame.getContentPane().add(panel_2);
noteFrame.setVisible(true);
}
});
btnNewNote.setBounds(293, 16, 461, 151);
panel.add(btnNewNote);
JLabel lblNotes = new JLabel("Notes:");
lblNotes.setBounds(10, 0, 46, 23);
panel_2.add(lblNotes);
lblNotes.setFont(new Font("Yu Gothic", Font.BOLD, 13));
JButton btnSaveCreate = new JButton("Create & Save");
btnSaveCreate.setBounds(237, 177, 131, 23);
panel_2.add(btnSaveCreate);
JCheckBox checkBox_5 = new JCheckBox("");
checkBox_5.setBounds(210, 177, 21, 23);
panel_2.add(checkBox_5);
btnSaveCreate.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String NAME = textField.getText();
String DATE = textField_1.getText();
String TIME = textField_2.getText();
String LOCATION = textField_3.getText();
String Referee = textField_4.getText();
if(checkBox.isSelected() && checkBox_1.isSelected() && checkBox_2.isSelected() && checkBox_2.isSelected() && checkBox_3.isSelected() && checkBox_4.isSelected() && checkBox_5.isSelected())
{
infoBox("Met with " + NAME + " on " + DATE + " #" + TIME + ", and went to " + LOCATION + ", then I was introduced by " + Referee, "Paragraph");
}
else {
errorMessage("Error: Please validate entries!", "Error!");
}
}
});
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
btnNewButton.hide();
panel.setVisible(true);
}
});
try {
String content = textField_5.getText();
File file = new File("/users/David/filename.txt");
// if file doesnt exists, then create it
if (!file.exists()) {
file.createNewFile();
}
FileWriter fw = new FileWriter(file.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(fw);
bw.write(content); //step2: write it
bw.close();
System.out.println("Done");
} catch (IOException e) {
e.printStackTrace(); **** *****
}
#Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
}
}
Any Help is greatly appreciated!

You just forgot to add the } in this statement:
catch (IOException e) {
e.printStackTrace();
}
Just as Andrew Thompson said: simple indentation would have made this error a lot easier to spot if done properly, and should be used as common practice.

Toggle Java JPanels - each panel deifferent class

I'm a beginer in Java GUI, and i have an issue with trying to toggle between panel in other class.
My main Class "MyBoxGUI" has 2 Panels, "Login" and "UserMenu"
The default is "Login" panel, when pressing "OK" the window moved to "UserMenu" Panel.
So far so good while in the same class.
The issue is, when i set a new panel in new class and setvisibe that panel, i can't go back to "UserMenu" panel - (The actionlistener is working fine).
Can someone help me please?
MyBoxGUI Class
package main;
import java.awt.EventQueue;
import javax.swing.JFrame;
import java.awt.CardLayout;
import java.awt.Component;
//import javax.swing.JDialog;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JLabel;
import java.awt.Font;
import java.awt.Color;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import java.awt.Toolkit;
import GUIs.*;
//import ocsf.client.*;
public class MyBoxGUI extends JPanel
{
private Mtds mtd;
public JFrame frmMybox;
private static JTextField UserName;
private static JTextField port;
private static JTextField IP;
private static JPasswordField passwordField;
public final JPanel Login = new JPanel();
public final JPanel UserMenu = new JPanel();
/**
* Launch the application.
*/
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
try
{
MyBoxGUI window = new MyBoxGUI();
window.frmMybox.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public MyBoxGUI()
{
mtd = new Mtds();
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize()
{
frmMybox = new JFrame();
frmMybox.setFont(new Font("Tempus Sans ITC", Font.BOLD, 15));
// frmMybox.setIconImage(Toolkit.getDefaultToolkit().getImage(MyBoxGUI.class.getResource("/images/gift-ideas-gift-card-bridal-gift-baby-shower-gift-gift-box-groom-gift-christmas-gift-party-gift-gift-for-wedding-friend-gift-birthday-gift-baby-gift-good-gift-box-ideas-for-friend-necklace-gift-box.jpg")));
frmMybox.setBounds(100, 100, 800, 500);
frmMybox.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frmMybox.getContentPane().setLayout(new CardLayout(0, 0));
frmMybox.setTitle("MyBox");
frmMybox.getContentPane().add(Login);
Login.setLayout(null);
JButton btnNewButton = new JButton("OK");
btnNewButton.addActionListener(new ActionListener()
{
#SuppressWarnings("deprecation")
public void actionPerformed(ActionEvent arg0)
{
Boolean ok = false;
String UName, Pass, Prt, SIP;
UName = UserName.getText();
Pass = passwordField.getText();
Prt = port.getText();
SIP = IP.getText();
if( ( mtd.isUserValid(UName) && mtd.isPasswordValid(Pass) && mtd.isPortValid(Prt) && mtd.isIPValid(SIP))
&& ( !UName.equals("") && !Pass.equals("") && !Prt.equals("") && !SIP.equals("") ) )
ok = true;
else
{
if(!mtd.isUserValid(UName) || UName.equals(""))
JOptionPane.showMessageDialog(frmMybox,"User Name Can Contain Only The Following Characters: ( 0-9 , a-z , A-Z , _ )"
+ " ","Invalid characters",JOptionPane.WARNING_MESSAGE);
else if(!mtd.isPasswordValid(Pass) || Pass.equals(""))
JOptionPane.showMessageDialog(frmMybox,"Invalid characters","Error Message",JOptionPane.WARNING_MESSAGE);
else if(!mtd.isPortValid(Prt) || Prt.equals(""))
JOptionPane.showMessageDialog(frmMybox,"Port Can Contain Only Numbers","Invalid characters",JOptionPane.WARNING_MESSAGE);
else if(!mtd.isIPValid(SIP) || SIP.equals(""))
JOptionPane.showMessageDialog(frmMybox,"IP Address Can Contain Only Numbers seperated By Dots '.' ","Invalid characters",JOptionPane.WARNING_MESSAGE);
}
if(ok)
{
//LoginController user = new LoginController();
//chat= new ClientGUI(IP.getText(),port.getText());
//client = ClientGUI.getClient();
//msg=new Msg("login",user);
//client.handleMessageFromClientUI(msg);
setScreen(Login,UserMenu);
// frmMybox.getContentPane().add(UserMenu, "UserMenu");
// UserMenu.setVisible(true);
// Login.setVisible(false);
}
}
});
btnNewButton.setBounds(344, 313, 82, 48);
Login.add(btnNewButton);
JLabel lblWellcomeToMybox = new JLabel("Wellcome to MyBox");
lblWellcomeToMybox.setForeground(new Color(51, 204, 255));
lblWellcomeToMybox.setFont(new Font("Arial", Font.PLAIN, 36));
lblWellcomeToMybox.setBounds(224, 23, 327, 42);
Login.add(lblWellcomeToMybox);
JLabel lblUserName = new JLabel("User Name:");
lblUserName.setBounds(268, 109, 89, 14);
lblUserName.setFont(new Font("Arial", Font.PLAIN, 14));
Login.add(lblUserName);
JLabel lblPassword = new JLabel("Password:");
lblPassword.setBounds(268, 139, 69, 14);
lblPassword.setFont(new Font("Arial", Font.PLAIN, 14));
Login.add(lblPassword);
JLabel lblServerPort = new JLabel("Server port:");
lblServerPort.setBounds(268, 197, 82, 14);
lblServerPort.setFont(new Font("Arial", Font.PLAIN, 14));
Login.add(lblServerPort);
JLabel lblServerIp = new JLabel("Server IP:");
lblServerIp.setBounds(266, 222, 71, 14);
lblServerIp.setFont(new Font("Arial", Font.PLAIN, 14));
Login.add(lblServerIp);
UserName = new JTextField();
UserName.setBounds(406, 107, 96, 20);
Login.add(UserName);
UserName.setColumns(10);
port = new JTextField();
port.setBounds(406, 195, 96, 20);
Login.add(port);
port.setColumns(10);
IP = new JTextField();
IP.setBounds(406, 220, 96, 20);
Login.add(IP);
IP.setColumns(10);
passwordField = new JPasswordField();
passwordField.setBounds(406, 137, 96, 20);
Login.add(passwordField);
frmMybox.getContentPane().add(UserMenu, "User Menu");
UserMenu.setLayout(null);
JButton LeaveGOI = new JButton("Back");
LeaveGOI.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0)
{
setScreen(UserMenu,Login);
}
});
LeaveGOI.setBounds(10, 66, 153, 23);
UserMenu.add(LeaveGOI);
JButton btnJoinAGoi = new JButton("Join a GOI");
btnJoinAGoi.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{
}
});
btnJoinAGoi.setBounds(10, 100, 153, 23);
UserMenu.add(btnJoinAGoi);
JButton btnSearchForA = new JButton("Search for a GOI");
btnSearchForA.setBounds(10, 134, 153, 23);
UserMenu.add(btnSearchForA);
JButton btnCreateAGoi = new JButton("Create a GOI");
btnCreateAGoi.setBounds(10, 32, 153, 23);
UserMenu.add(btnCreateAGoi);
JButton btnFilesSharedWith = new JButton("Files shared with you");
btnFilesSharedWith.setBounds(271, 66, 153, 23);
UserMenu.add(btnFilesSharedWith);
JButton btnUploadAFile = new JButton("Upload a file");
btnUploadAFile.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{
JPanel UpLoad = new UploadFile();
setScreen(UserMenu,UpLoad);
// frmMybox.getContentPane().add(UpLoad, "UpLoad");
// UserMenu.setVisible(false);
// UpLoad.setVisible(true);
}
});
btnUploadAFile.setBounds(271, 32, 153, 23);
UserMenu.add(btnUploadAFile);
JButton btnSignout = new JButton("Sign-Out");
btnSignout.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int dialog=JOptionPane.showConfirmDialog(Login, getUserName()+", are you sure you wants to leave?", "Do you want to leave?", JOptionPane.YES_NO_OPTION);
if(dialog==0){
//client.quit();
}
}
});
btnSignout.setBounds(293, 227, 131, 23);
UserMenu.add(btnSignout);
JButton btnHelpme = new JButton("Help-Me");
btnHelpme.addActionListener(new ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
JOptionPane.showMessageDialog(Login,"Hello "+ getUserName()+", wellcom to Mybox!\n"
+ "Inside GOIs buttons you can ask to join, leave and even create a GOI.\n"
+ "Inside Files buttons you can check and edit files people shared with you.\n"
+ "You can even become an uploader and share files you own.\n"
+ "We wish you good luck and have fun using MyBox!");
}
});
btnHelpme.setBounds(10, 227, 131, 23);
UserMenu.add(btnHelpme);
}
public static String getUserName(){
return UserName.getText();
}
#SuppressWarnings("deprecation")
public static String getPassword(){
return passwordField.getText();
}
public static String getIP(){
return IP.getText();
}
public static String getPort(){
return port.getText();
}
public void setScreen(JPanel fls, JPanel tru)
{
frmMybox.getContentPane().add(tru);
tru.setVisible(true);
fls.setVisible(false);
}
}
UploadFile Class
package GUIs;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JTextField;
import main.MyBoxGUI;
public class UploadFile extends MyBoxGUI {
private JTextField textField;
/**
* Create the panel.
*/
public static final JPanel UpLoad = new JPanel();
public UploadFile()
{
setBounds(100, 100, 800, 500);
setLayout(null);
JButton btnNewButton = new JButton("Back");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0)
{
setScreen(UpLoad,UserMenu);
System.out.print("A+++");
}
});
btnNewButton.setBounds(126, 145, 205, 30);
add(btnNewButton);
textField = new JTextField();
textField.setBounds(409, 150, 300, 20);
add(textField);
textField.setColumns(10);
JButton btnDone = new JButton("Done");
btnDone.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
btnDone.setBounds(365, 223, 89, 30);
add(btnDone);
JButton btnHelpMe = new JButton("Help Me");
btnHelpMe.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
btnHelpMe.setBounds(188, 390, 122, 52);
add(btnHelpMe);
JButton SignOut = new JButton("Sign-Out");
SignOut.setBounds(501, 392, 122, 48);
add(SignOut);
}
}

public void setScreen(JPanel fls, JPanel tru)
{
frmMybox.getContentPane().add(tru);
tru.setVisible(true);
fls.setVisible(false);
frmMybox.getContentPane().revalidate();
frmMybox.getContentPane().repaint();
}
update your setScreen method as above.

JApplet issue stating class not found and class not found exception

I am having an issue that is giving me an error message and a blank applet is appearing. The error message says load:class Myapp.class not found and java.lang.ClassNotFoundException and then a list of lines saying # and then some other jargon.
If I run try to run the program as a Jcreator applet like I expected I get the prior stated error and if I run it in an application it just gives me the main method error.
Here is my program:
package MyPack;
import javax.swing.*;
import java.awt.event.*;
public class Myapp extends JApplet implements ItemListener{
JButton jbtnOne;
JButton jbtnTwo;
JLabel jlab;
JComboBox comboBox;
JComboBox comboBox_1;
JCheckBox chckbxPizza;
JCheckBox chckbxBurger;
JCheckBox chckbxSalad;
JLabel label_3;
private JTextField textField;
private JTextField textField_1;
private JTextField textField_2;
JTextArea txtrCommentsForSpecial;
JTextArea txtrCommentsForSpecial_2;
JTextArea txtrCommentsForSpecial_1;
JInternalFrame internalFrame;
public Myapp() {
}
public void init() {
setSize(700,640);
// setVisible(true);
try {
SwingUtilities.invokeAndWait(new Runnable () {
public void run() {
guiInit(); // initialize the GUI
}
});
} catch(Exception exc) {
System.out.println("Can't create because of "+ exc);
}
}
// Called second, after init(). Also called
// whenever the applet is restarted.
public void start() {
// Not used by this applet.
}
// Called when the applet is stopped.
public void stop() {
// Not used by this applet.
}
// Called when applet is terminated. This is
// the last method executed.
public void destroy() {
// Not used by this applet.
}
// Setup and initialize the GUI.
private void guiInit() {
// Create two buttons and a label.
// setLayout(null);
String a[] = { "Chiken Tikka", "Fajita", "Vegetable"};
comboBox = new JComboBox(a);
comboBox.setBounds(115, 103, 100, 20);
comboBox.addItemListener(this);
getContentPane().add(comboBox);
String b[] = { "small", "medium","large","extra large"};
comboBox_1 = new JComboBox(b);
// comboBox_1.addItemListener(this);
// comboBox_1.setEnabled(false);
getContentPane().add(comboBox_1);
comboBox_1.setBounds(290, 103, 140, 20);
// setSize(300, 300);
getContentPane().setLayout(null);
JLabel lblSelectMenu = new JLabel("Select Menu");
lblSelectMenu.setForeground(new Color(72, 61, 139));
lblSelectMenu.setFont(new Font("Segoe Script", Font.BOLD, 16));
lblSelectMenu.setBounds(58, 10, 107, 34);
getContentPane().add(lblSelectMenu);
chckbxPizza = new JCheckBox("Pizza");
chckbxPizza.setBounds(37, 64, 97, 23);
getContentPane().add(chckbxPizza);
JLabel lblFlavour = new JLabel("flavour");
lblFlavour.setBounds(60, 103, 45, 20);
getContentPane().add(lblFlavour);
JLabel lblSize = new JLabel("size");
lblSize.setBounds(253, 103, 45, 20);
getContentPane().add(lblSize);
JLabel lblQty = new JLabel("Qty");
lblQty.setBounds(451, 103, 35, 20);
getContentPane().add(lblQty);
textField = new JTextField();
textField.setBounds(485, 103, 86, 20);
getContentPane().add(textField);
textField.setColumns(10);
JLabel lblComments = new JLabel("comments");
lblComments.setBounds(139, 154, 76, 20);
getContentPane().add(lblComments);
txtrCommentsForSpecial = new JTextArea();
txtrCommentsForSpecial.setForeground(new Color(220, 220, 220));
txtrCommentsForSpecial.setText("comments for special features");
txtrCommentsForSpecial.setBounds(210, 154, 268, 61);
getContentPane().add(txtrCommentsForSpecial);
chckbxBurger = new JCheckBox("Burger");
chckbxBurger.setBounds(37, 236, 97, 23);
getContentPane().add(chckbxBurger);
JLabel label = new JLabel("flavour");
label.setBounds(60, 286, 45, 20);
getContentPane().add(label);
String c[] = { "Fish", "Vegetable", "Chicken"};
JComboBox comboBox_2 = new JComboBox(c);
comboBox_2.setBounds(115, 286, 100, 20);
getContentPane().add(comboBox_2);
JLabel label_1 = new JLabel("size");
label_1.setBounds(253, 286, 45, 20);
getContentPane().add(label_1);
JComboBox comboBox_3 = new JComboBox(b);
comboBox_3.setBounds(290, 286, 110, 20);
getContentPane().add(comboBox_3);
JLabel label_2 = new JLabel("Qty");
label_2.setBounds(451, 286, 35, 20);
getContentPane().add(label_2);
textField_1 = new JTextField();
textField_1.setBounds(485, 286, 86, 20);
getContentPane().add(textField_1);
textField_1.setColumns(10);
label_3 = new JLabel("comments");
label_3.setBounds(139, 340, 76, 20);
getContentPane().add(label_3);
txtrCommentsForSpecial_1 = new JTextArea();
txtrCommentsForSpecial_1.setForeground(new Color(220, 220, 220));
txtrCommentsForSpecial_1.setText("comments for special features");
txtrCommentsForSpecial_1.setBounds(210, 340, 268, 61);
getContentPane().add(txtrCommentsForSpecial_1);
chckbxSalad = new JCheckBox("Soft Drink");
chckbxSalad.setBounds(37, 424, 97, 23);
getContentPane().add(chckbxSalad);
JLabel label_4 = new JLabel("flavour");
label_4.setBounds(60, 475, 45, 20);
getContentPane().add(label_4);
String f[] = { "Pepsi", "Coca Cola", "Sprite","7up"};
JComboBox comboBox_4 = new JComboBox(f);
comboBox_4.setBounds(115, 475, 86, 20);
getContentPane().add(comboBox_4);
JLabel label_5 = new JLabel("size");
label_5.setBounds(253, 475, 45, 20);
getContentPane().add(label_5);
JComboBox comboBox_5 = new JComboBox(b);
comboBox_5.setBounds(290, 475, 110, 20);
getContentPane().add(comboBox_5);
JLabel label_6 = new JLabel("Qty");
label_6.setBounds(451, 475, 35, 20);
getContentPane().add(label_6);
textField_2 = new JTextField();
textField_2.setBounds(485, 475, 86, 20);
getContentPane().add(textField_2);
textField_2.setColumns(10);
JLabel label_7 = new JLabel("comments");
label_7.setBounds(139, 546, 76, 20);
getContentPane().add(label_7);
txtrCommentsForSpecial_2 = new JTextArea();
txtrCommentsForSpecial_2.setForeground(new Color(220, 220, 220));
txtrCommentsForSpecial_2.setText("comments for special features");
txtrCommentsForSpecial_2.setBounds(210, 546, 268, 61);
getContentPane().add(txtrCommentsForSpecial_2);
JButton btnNewButton = new JButton("Ok");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
internalFrame = new JInternalFrame("Order Details");
internalFrame.setBounds(100, 80, 450, 300);
internalFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
internalFrame.getContentPane().setLayout(null);
internalFrame.setVisible(true);
JTextArea textArea = new JTextArea();
textArea.setBounds(67, 52, 270, 149);
internalFrame.getContentPane().add(textArea);
JButton btnOk = new JButton("Ok");
btnOk.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
internalFrame.setVisible(false);
}
});
btnOk.setBounds(164, 212, 89, 23);
internalFrame.getContentPane().add(btnOk);
JLabel lblOrderYouPlaced = new JLabel("Order You Placed");
lblOrderYouPlaced.setBounds(67, 26, 98, 14);
internalFrame.getContentPane().add(lblOrderYouPlaced);
getContentPane().add(internalFrame);
}
});
btnNewButton.setBounds(162, 616, 89, 23);
getContentPane().add(btnNewButton);
JButton btnNewButton_1 = new JButton("Reset");
btnNewButton_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText("");
textField_1.setText("");
textField_2.setText("");
chckbxPizza.setText("");
chckbxBurger.setText("");
chckbxSalad.setText("");
txtrCommentsForSpecial.setText("");
txtrCommentsForSpecial_2.setText("");
txtrCommentsForSpecial_1.setText("");
}
});
btnNewButton_1.setBounds(279, 616, 89, 23);
getContentPane().add(btnNewButton_1);
JButton btnNewButton_2 = new JButton("Cancel");
btnNewButton_2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
btnNewButton_2.setBounds(389, 616, 89, 23);
getContentPane().add(btnNewButton_2);
}
public void itemStateChanged(ItemEvent e) {
String b[] = { "Chikken Tikka", "Fajita" };
String c[] = { "Fish", "Vegetable", "Chicken"};
String d[] = { "Russian Salad", "Fruit Salad", "Beans Salad"};
String f[] = { "Pepsi", "Coca Cola", "Sprite","7up"};
if (e.getSource() == comboBox) {
if (comboBox.getSelectedItem().equals("Select")) {
comboBox_1.setEnabled(false);
} else if (comboBox.getSelectedItem().equals("Pizza")) {
comboBox_1.setEnabled(true);
comboBox_1.removeAllItems();
for (int i = 0; i < b.length; i++) {
comboBox_1.addItem(b[i]);
}
} else if (comboBox.getSelectedItem().equals("Burger")) {
comboBox_1.setEnabled(true);
comboBox_1.removeAllItems();
for (int i = 0; i < c.length; i++) {
comboBox_1.removeItem(c[i]);
comboBox_1.addItem(c[i]);
}
} else if (comboBox.getSelectedItem().equals("Salad")) {
comboBox_1.setEnabled(true);
comboBox_1.removeAllItems();
for (int i = 0; i < d.length; i++) {
comboBox_1.addItem(d[i]);
}
}else if (comboBox.getSelectedItem().equals("Soft Drink")) {
comboBox_1.setEnabled(true);
comboBox_1.removeAllItems();
for (int i = 0; i < f.length; i++) {
comboBox_1.addItem(f[i]);
}
}
}
}
}

Write the itemListener with a captial letter like this
public class Myapp extends JApplet implements ItemListener{
and import all this packages:
import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;