So I have a Java GUI exercise from college to work on, about making a registration form.
I've [mistakenly] coded everything from beginning to end without testing, and found out that nothing actually appears on my GUI. The program was just a plain JFrame without anything inside, like in the picture above.
I've tried to find out why this happened, however I haven't found any clue why. So your help is appreciated.
So far, I haven't found any duplicate of this question. I found that my issue is somewhat different from other users. So, I'd like to apologize as if there's one duplicate or so.
Below is the code: (you may want to take a keen look at this)
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class RegistrationForm extends JFrame {
private JPanel panel;
private JPanel northPanel;
private JPanel eastPanel;
private JPanel westPanel;
private JPanel southPanel;
private JPanel centerPanel;
private JPanel formPanel;
private JPanel basicFormPanel;
private JPanel addressPanel;
private JPanel typePanel;
private JPanel cityPanel;
private JPanel agreementPanel;
private JPanel buttonPanel;
private JLabel formTitle;
private JLabel lblName;
private JLabel lblEmail;
private JLabel lblPhone;
private JLabel lblAddress;
private JLabel lblType;
private JLabel lblCity;
private JTextField name;
private JTextField email;
private JTextField phone;
private JScrollPane addressScroll;
private JTextArea address;
private ButtonGroup type;
private JRadioButton silver;
private JRadioButton gold;
private JRadioButton platinum;
private JComboBox<String> city;
private JCheckBox agreement;
private JButton submit;
private JButton reset;
public RegistrationForm() {
initElements();
initView();
initFormPanels();
}
public void initElements() {
panel = new JPanel();
northPanel = new JPanel();
eastPanel = new JPanel();
westPanel = new JPanel();
southPanel = new JPanel();
centerPanel = new JPanel();
formPanel = new JPanel();
basicFormPanel = new JPanel();
addressPanel = new JPanel();
typePanel = new JPanel();
cityPanel = new JPanel();
agreementPanel = new JPanel();
buttonPanel = new JPanel();
formTitle = new JLabel("Registration Form");
formTitle.setFont(new Font("Arial", Font.PLAIN, 32));
lblName = new JLabel("Name");
lblEmail = new JLabel("Email");
lblPhone = new JLabel("Phone");
lblAddress = new JLabel("Address");
lblType = new JLabel("Type");
lblCity = new JLabel("City");
name = new JTextField();
email = new JTextField();
phone = new JTextField();
address = new JTextArea();
addressScroll = new JScrollPane(address);
type = new ButtonGroup();
silver = new JRadioButton("Silver");
gold = new JRadioButton("Gold");
platinum = new JRadioButton("Platinum");
String[] cities = {"Jakarta", "Bandung", "Bogor"};
city = new JComboBox<String>(cities);
agreement = new JCheckBox("I agree with the terms and conditions");
submit = new JButton("Submit");
reset = new JButton("Reset");
}
public void initView() {
panel.setLayout(new BorderLayout());
panel.add(northPanel, BorderLayout.NORTH);
panel.add(eastPanel, BorderLayout.EAST);
panel.add(westPanel, BorderLayout.WEST);
panel.add(southPanel, BorderLayout.SOUTH);
panel.add(centerPanel, BorderLayout.CENTER);
northPanel.setBackground(Color.black);
northPanel.setPreferredSize(new Dimension(50, 50));
formTitle.setForeground(Color.white);
eastPanel.setBackground(Color.black);
westPanel.setBackground(Color.black);
southPanel.setBackground(Color.black);
centerPanel.setBackground(Color.gray);
formPanel.setBackground(Color.gray);
basicFormPanel.setBackground(Color.gray);
addressPanel.setBackground(Color.gray);
typePanel.setBackground(Color.gray);
cityPanel.setBackground(Color.gray);
agreementPanel.setBackground(Color.gray);
formPanel.add(basicFormPanel);
formPanel.add(addressPanel);
formPanel.add(typePanel);
formPanel.add(cityPanel);
formPanel.add(agreementPanel);
formPanel.add(buttonPanel);
centerPanel.add(formPanel);
buttonPanel.setBackground(Color.black);
buttonPanel.add(submit);
buttonPanel.add(reset);
southPanel.add(buttonPanel);
}
public void initFormPanels() {
// basic form panel
basicFormPanel.setLayout(new GridLayout(3, 3, 5, 5));
basicFormPanel.add(lblName);
basicFormPanel.add(name);
basicFormPanel.add(lblEmail);
basicFormPanel.add(email);
basicFormPanel.add(lblPhone);
basicFormPanel.add(phone);
// address panel
addressPanel.setLayout(new GridLayout(1, 2, 5, 5));
addressPanel.add(lblAddress);
addressPanel.add(addressScroll);
// type panel
typePanel.setLayout(new GridLayout(1, 2, 5, 5));
typePanel.add(lblType);
type.add(silver);
type.add(gold);
type.add(platinum);
buttonPanel.add(silver);
buttonPanel.add(gold);
buttonPanel.add(platinum);
typePanel.add(buttonPanel);
// city panel
cityPanel.setLayout(new GridLayout(1, 2, 5, 5));
cityPanel.add(lblCity);
cityPanel.add(city);
// agreement checkbox panel
agreementPanel.setLayout(new FlowLayout());
agreementPanel.add(agreement);
// button panel
buttonPanel.add(submit);
buttonPanel.add(reset);
// set preferred sizes
basicFormPanel.setPreferredSize(new Dimension(400, 100));
addressPanel.setPreferredSize(new Dimension(400, 90));
cityPanel.setPreferredSize(new Dimension(400, 30));
typePanel.setPreferredSize(new Dimension(400, 50));
agreementPanel.setPreferredSize(new Dimension(400, 30));
buttonPanel.setPreferredSize(new Dimension(400, 50));
}
public static void main(String[] args) {
RegistrationForm gui = new RegistrationForm();
gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gui.setSize(450, 450);
gui.setTitle("Registration");
gui.setLocationRelativeTo(null);
gui.setVisible(true);
}
}
Thanks for helping out. I hope I'll get this done very soon.
