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Java GUI Swing Passing Parameter From Another Class

Im bulding a GUI using eclipse plugin WindowsBuilder, im trying to pass a variable "comboBox kombo" from the initialize() method. I cant call the method to run my passed variable. The method supposed to get the data from my database to the comboBox.
Below i have attached my coding, any help will be appreciated ,Thank you!
import java.awt.EventQueue;
import javax.swing.JFrame;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.Color;
import java.awt.Label;
import java.awt.Font;
import javax.swing.JComboBox;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.swing.JTextField;
public class book extends JFrame {
Connection con = null;
PreparedStatement pst = null;
ResultSet rs = null;
private JFrame mdetail;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
book window = new book();
window.mdetail.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public book() {
initialize();
comboBox(kombo);
}
private void comboBox(JComboBox kombo) {
try
{
con= DriverManager.getConnection("jdbc:mysql://localhost/oop_project", "root","");
String sql = "select movieName from movie ";
pst = con.prepareStatement(sql);
rs = pst.executeQuery();
while(rs.next())
{
String name = rs.getString("movieName");
kombo.addItem(name);
}
}catch(Exception ex)
{
JOptionPane.showMessageDialog(null, ex);
}
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
mdetail = new JFrame();
mdetail.setTitle("Book Ticket");
mdetail.setBounds(100, 100, 450, 336);
mdetail.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mdetail.getContentPane().setLayout(null);
Label label = new Label("Movie Details");
label.setForeground(Color.BLACK);
label.setFont(new Font("Dialog", Font.PLAIN, 21));
label.setBounds(135, 10, 184, 54);
mdetail.getContentPane().add(label);
JComboBox kombo = new JComboBox();
kombo.setBounds(155, 70, 226, 22);
mdetail.getContentPane().add(kombo);
Label label_1 = new Label("Select Movie");
label_1.setBounds(74, 70, 75, 22);
mdetail.getContentPane().add(label_1);
Label label_1_1 = new Label("Select Date");
label_1_1.setBounds(74, 103, 75, 22);
mdetail.getContentPane().add(label_1_1);
JComboBox comboBox_1 = new JComboBox();
comboBox_1.setModel(new DefaultComboBoxModel(new String[] {"11-12-2022", "12-12-2022", "13-12-2022"}));
comboBox_1.setBounds(155, 103, 226, 22);
mdetail.getContentPane().add(comboBox_1);
Label label_1_1_1 = new Label("Select Time");
label_1_1_1.setBounds(74, 136, 75, 22);
mdetail.getContentPane().add(label_1_1_1);
JComboBox comboBox_1_1 = new JComboBox();
comboBox_1_1.setModel(new DefaultComboBoxModel(new String[] {"7.00am", "10.00am", "1.00pm", "5.00pm", "8.00pm"}));
comboBox_1_1.setBounds(155, 136, 226, 22);
mdetail.getContentPane().add(comboBox_1_1);
Label label_1_1_2 = new Label("Select Seat");
label_1_1_2.setBounds(74, 169, 75, 22);
mdetail.getContentPane().add(label_1_1_2);
JComboBox comboBox_1_2 = new JComboBox();
comboBox_1_2.setModel(new DefaultComboBoxModel(new String[] {"A(01)", "B(02)", "B(03)"}));
comboBox_1_2.setBounds(155, 169, 226, 22);
mdetail.getContentPane().add(comboBox_1_2);
JButton btnNewButton = new JButton("SUBMIT");
btnNewButton.setBounds(155, 241, 89, 23);
mdetail.getContentPane().add(btnNewButton);
JLabel lblNewLabel = new JLabel("View Seat Position");
lblNewLabel.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
seatposition.main(null);
mdetail.setVisible(false);
}
});
lblNewLabel.setBounds(282, 245, 112, 14);
mdetail.getContentPane().add(lblNewLabel);
Label label_1_2 = new Label("Welcome \"user\"");
label_1_2.setBounds(10, 10, 89, 22);
mdetail.getContentPane().add(label_1_2);
Label label_1_1_2_1_1 = new Label("Number of ticket");
label_1_1_2_1_1.setBounds(53, 202, 101, 22);
mdetail.getContentPane().add(label_1_1_2_1_1);
JComboBox comboBox_1_2_1 = new JComboBox();
comboBox_1_2_1.setBounds(155, 202, 226, 22);
mdetail.getContentPane().add(comboBox_1_2_1);
JMenuBar menuBar = new JMenuBar();
mdetail.setJMenuBar(menuBar);
JMenu mnNewMenu = new JMenu("Option");
menuBar.add(mnNewMenu);
JMenuItem mntmNewMenuItem = new JMenuItem("Logout");
mnNewMenu.add(mntmNewMenuItem);
JMenuItem exitmenu = new JMenuItem("Exit");
exitmenu.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int exit = JOptionPane.showConfirmDialog(null, "Are you sure you want to exit", "Exit", JOptionPane.YES_NO_OPTION);
if(exit==JOptionPane.YES_OPTION) {
System.exit(0);
}else {
mdetail.setVisible(true);
}
}
});
mnNewMenu.add(exitmenu);
}
}

How to show the Oracle table list in a JTable?

So I am trying to build a CRUD app, I am able to perform all the operations in a console app and now I want to use the same methods in my GUI application. I have setup all the necessary fields and a table, the add button works and I can implement the others too! my question is how to work with the JTable?
Here is the code for my window builder. You can see that I have set columns for the tables too.
this is what the GUI looks like
package clientGUI;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.table.DefaultTableModel;
import bus.Student;
import data.ConnectionDB;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.ArrayList;
import java.awt.event.ActionEvent;
import java.awt.Font;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
public class DbTester1 {
private JFrame frame;
private JTextField textID;
private JTextField textFN;
private JTextField txtLN;
private JTable table;
private JTable table_1;
ArrayList<Student> studentList= null;
String query = "" ;
Statement stmt = null;
ResultSet rs = null;
Student aStudent = null;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
DbTester1 window = new DbTester1();
window.frame.setVisible(true);
}
});
}
public DbTester1() {
initialize();
}
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 732, 695);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
JLabel lblID = new JLabel("ID");
lblID.setBounds(10, 11, 46, 14);
frame.getContentPane().add(lblID);
JLabel lblFN = new JLabel("FN");
lblFN.setBounds(11, 42, 57, 14);
frame.getContentPane().add(lblFN);
JLabel lblLN = new JLabel("LN");
lblLN.setBounds(10, 79, 46, 14);
frame.getContentPane().add(lblLN);
textID = new JTextField();
textID.setBounds(78, 8, 86, 20);
frame.getContentPane().add(textID);
textID.setColumns(10);
textFN = new JTextField();
textFN.setBounds(78, 39, 86, 20);
frame.getContentPane().add(textFN);
textFN.setColumns(10);
txtLN = new JTextField();
txtLN.setBounds(78, 76, 86, 20);
frame.getContentPane().add(txtLN);
txtLN.setColumns(10);
ArrayList<Student> studList = new ArrayList<Student>();
JButton btnAdd = new JButton("Add");
btnAdd.setFont(new Font("Tahoma", Font.PLAIN, 8));
btnAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Student aStudent = new Student(Integer.parseInt(textID.getText()) ,
textFN.getText(), txtLN.getText());
studList.add(aStudent);
}
});
btnAdd.setBounds(0, 103, 89, 23);
frame.getContentPane().add(btnAdd);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(174, 11, 250, 292);
frame.getContentPane().add(scrollPane);
table = new JTable();
table.setModel(new DefaultTableModel(
new Object[][] {
},
new String[] {
"ID", "FN", "LN"
}
));
scrollPane.setViewportView(table);
table_1 = new JTable();
scrollPane.setColumnHeaderView(table_1);
JButton btnConnect = new JButton("Connect");
btnConnect.setFont(new Font("Tahoma", Font.PLAIN, 8));
btnConnect.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Connection con = null;
try {
con = ConnectionDB.getConnection();
JOptionPane.showMessageDialog(null, "Connection
Established!");
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
JOptionPane.showMessageDialog(null, "Connection failed!");
}
}
});
btnConnect.setBounds(0, 128, 89, 23);
frame.getContentPane().add(btnConnect);
JButton btnSearch = new JButton("Search");
btnSearch.setFont(new Font("Tahoma", Font.PLAIN, 8));
btnSearch.setBounds(0, 153, 89, 23);
frame.getContentPane().add(btnSearch);
JButton btnUpdate = new JButton("Update");
btnUpdate.setFont(new Font("Tahoma", Font.PLAIN, 8));
btnUpdate.setBounds(0, 178, 89, 23);
frame.getContentPane().add(btnUpdate);
JButton btnRefresh = new JButton("Refresh");
btnRefresh.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Connection con = null;
try {
con = ConnectionDB.getConnection();
String id, fn, ln;
query = "select * from student";
stmt = con.createStatement();
rs = stmt.executeQuery(query);
studentList = new ArrayList<Student> ();
while(rs.next())
{
id = rs.getString(1);
fn = rs.getString(2);
ln = rs.getString(3);
aStudent = new Student(Integer.parseInt(id) , fn, ln);
studentList.add(aStudent);
}
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
JOptionPane.showMessageDialog(null, "Connection read
data!!!!!");
}
}
});
btnRefresh.setFont(new Font("Tahoma", Font.PLAIN, 8));
btnRefresh.setBounds(0, 205, 89, 23);
frame.getContentPane().add(btnRefresh);
}
}

Calling another JFrame after veryfing user identity

any help would be greatly appreciated.
I've created 2 JFrames, one is a login window which verifies user credentials and I've linked it with my website's mySQL(This works and was hard since I'm very new to Java), and the other one is my main window which contains the main user interface where the user will work from.
I am trying to find a way that when user credentials are verified, the login window closes and opens the Main window. The more I dig into this, the more I think I've built this whole thing wrong, because both JFrames are built in main methods (I though this was how you did it, every tutorial begins with a main method).
to the actionPerform I've created on the JButton or textField_Password, but that does not work at all.Any idea how to open another class from actionPerform?
I would like to open the main window once user credentials are verified. Any ideas on how to proceed. This is all new to me and any help would be greaty appreciated.
Thanks in advance to anyone who helps me with this one, because I'm kind of stuck!
I was trying to add the following:
Main window = new Main();
window.frame.setVisible();
to my Jbutton actionPerform
here is the main code, any help would be greatly appreciated as I am a little loss
import javax.swing.JFrame;
import java.awt.SystemColor;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JLabel;
import java.awt.Font;
import java.awt.GridBagLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.SwingConstants;
//import com.mysql.jdbc.Connection;
//import com.mysql.jdbc.PreparedStatement;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.swing.JSeparator;
import javax.swing.JPasswordField;
import javax.swing.JCheckBox;
import java.awt.Cursor;
import java.awt.Desktop;
import java.awt.EventQueue;
import java.sql.SQLException;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
public class Login {
private JFrame frame;
private JTextField txtUsername;
private JPasswordField txtPassword;
final String signUp = ("https://www.google.com");
Connection con = null;
PreparedStatement pst = null;
ResultSet rs = null;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
Login window = new Login();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public Login() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.getContentPane().setBackground(Color.BLACK);
frame.setBounds(100, 100, 547, 382);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
frame.setLocationRelativeTo(null);
// frame.setUndecorated(true);
txtUsername = new JTextField();
txtUsername.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
txtUsername.setText(null);
}
});
JLabel labelResponse = new JLabel("");
labelResponse.setHorizontalAlignment(SwingConstants.CENTER);
labelResponse.setFont(new Font("Dialog", Font.BOLD, 12));
labelResponse.setForeground(Color.ORANGE);
labelResponse.setBounds(122, 280, 277, 30);
frame.getContentPane().add(labelResponse);
txtUsername.setBorder(null);
txtUsername.setHorizontalAlignment(SwingConstants.CENTER);
txtUsername.setFont(new Font("Meiryo", Font.BOLD, 18));
txtUsername.setForeground(new Color(0, 128, 0));
txtUsername.setOpaque(false);
txtUsername.setText("Username");
txtUsername.setBackground(SystemColor.inactiveCaption);
txtUsername.setBounds(82, 62, 353, 53);
frame.getContentPane().add(txtUsername);
txtUsername.setColumns(10);
/*
* JLabel labelClose = new JLabel("X");
*
labelClose.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
* labelClose.addMouseListener(new MouseAdapter() {
*
* #Override public void mouseClicked(MouseEvent e) {
System.exit(0); } });
* labelClose.setFont(new Font("Tahoma", Font.BOLD, 20));
* labelClose.setForeground(new Color(102, 205, 170));
labelClose.setBounds(493,
* 11, 22, 22); frame.getContentPane().add(labelClose);
*
* JLabel labelMin = new JLabel("-");
*
labelMin.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
* labelMin.addMouseListener(new MouseAdapter() {
*
* #Override public void mouseClicked(MouseEvent arg0) {
* frame.setState(Frame.ICONIFIED); } });
labelMin.setForeground(new Color(102,
* 205, 170)); labelMin.setFont(new Font("Tahoma", Font.BOLD,
20));
* labelMin.setBounds(470, 11, 22, 22);
frame.getContentPane().add(labelMin);
*/
JLabel lblGt = new JLabel("Log In");
lblGt.setForeground(new Color(0, 128, 0));
lblGt.setFont(new Font("Meiryo", Font.BOLD, 20));
lblGt.setBounds(10, 5, 88, 38);
frame.getContentPane().add(lblGt);
JSeparator separator = new JSeparator();
separator.setBounds(82, 113, 353, 2);
frame.getContentPane().add(separator);
JSeparator separator_1 = new JSeparator();
separator_1.setBounds(82, 190, 353, 2);
frame.getContentPane().add(separator_1);
JCheckBox chckbxShowPass = new JCheckBox("Show Pass");
chckbxShowPass.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
chckbxShowPass.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent evt) {
if (chckbxShowPass.isSelected()) {
txtPassword.setEchoChar((char) 0);
} else {
txtPassword.setEchoChar('*');
}
}
});
chckbxShowPass.setBorder(null);
chckbxShowPass.setOpaque(false);
chckbxShowPass.setForeground(new Color(0, 128, 0));
chckbxShowPass.setFont(new Font("Meiryo", Font.BOLD, 14));
chckbxShowPass.setBackground(new Color(0, 128, 0));
chckbxShowPass.setBounds(409, 281, 106, 23);
frame.getContentPane().add(chckbxShowPass);
JLabel labelRegister = new JLabel("Register");
labelRegister.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
labelRegister.setForeground(new Color(0, 128, 0));
labelRegister.setFont(new Font("Meiryo", Font.BOLD, 14));
labelRegister.setBounds(10, 285, 76, 16);
frame.getContentPane().add(labelRegister);
JButton buttonLogin = new JButton("Login");
buttonLogin.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con = (Connection)
DriverManager.getConnection(
"jdbc:mysql://localhost:3306/test", "root", "password"); // not the actual
String query = "select EmailAddress,
Password from users where EmailAddress LIKE '%"
+
txtUsername.getText() + "%'";
PreparedStatement statement =
con.prepareStatement(query);
ResultSet result =
statement.executeQuery();
if (result.next()) {
String dbasePassword =
result.getString("Password").toString().trim();
String enteredPassword = new
String(txtPassword.getText().trim());
if
(dbasePassword.equals(enteredPassword))
labelResponse.setText("User recognized");
else
labelResponse.setText("Verify credentials");
} else {
labelResponse.setText("You
must be registered to use this software.");
}
statement.close();
con.close();
} catch (SQLException se) {
se.printStackTrace();
} catch (Exception evt) {
evt.printStackTrace();
labelResponse.setText("Exception
occurred while searching in the users table");
}
}
});
txtPassword = new JPasswordField();
txtPassword.addKeyListener(new KeyAdapter() {
#Override
public void keyPressed(KeyEvent evt) {
if (evt.getKeyCode() == KeyEvent.VK_ENTER)
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con = (Connection)
DriverManager.getConnection(
"jdbc:mysql://localhost:3306/test", "root",
"password");
String query = "select
EmailAddress, Password from users where EmailAddress LIKE '%"
+
txtUsername.getText() + "%'";
PreparedStatement statement =
con.prepareStatement(query);
ResultSet result =
statement.executeQuery();
if (result.next()) {
String dbasePassword =
result.getString("Password").toString().trim();
String enteredPassword
= new String(txtPassword.getText().trim());
if
(dbasePassword.equals(enteredPassword))
labelResponse.setText("User recognized");
else
labelResponse.setText("Verify credentials");
} else {
labelResponse.setText("You must be registered to use this software.");
}
statement.close();
con.close();
} catch (SQLException se) {
se.printStackTrace();
} catch (Exception evte) {
evte.printStackTrace();
labelResponse.setText("Exception occurred while searching in the users
table");
}
}
});
txtPassword.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
txtPassword.setText(null);
}
});
txtPassword.setText("Password");
txtPassword.setBorder(null);
txtPassword.setHorizontalAlignment(SwingConstants.CENTER);
txtPassword.setForeground(new Color(0, 128, 0));
txtPassword.setFont(new Font("Meiryo", Font.BOLD, 18));
txtPassword.setOpaque(false);
txtPassword.setBackground(SystemColor.inactiveCaption);
txtPassword.setBounds(82, 139, 353, 53);
frame.getContentPane().add(txtPassword);
buttonLogin.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
buttonLogin.setBorderPainted(false);
buttonLogin.setBackground(new Color(0, 128, 0));
buttonLogin.setFont(new Font("Tahoma", Font.PLAIN, 18));
buttonLogin.setBounds(82, 216, 353, 53);
frame.getContentPane().add(buttonLogin);
labelRegister.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent me) {
try {
Desktop.getDesktop().browse(new
URI("insertURL"));
} catch (Exception ex) {
// System.out.println(ex);
}
}
});
}
}

I found a solution and I will post it here. Hopefully it helps other new coders out there.
My main problem was that I was trying to link two application windows. Instead of selecting New/Other/Jframe, I used New/Other/Application Window which makes it tough to call the second window.

How to add some row's specific info to JTexFields using MySQL

I have been trying to add a table rows' info to JTextField components after clicking with the mouse however it doesn't work. I have used the DefaultTableModel and JTable as shown below.
Here is the code I have been using.
package scrCode;
import java.util.*;
import java.sql.*;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.border.EmptyBorder;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
import net.proteanit.sql.DbUtils;
import javax.swing.JTable;
import javax.swing.JLabel;
import java.awt.Font;
import javax.swing.SwingConstants;
import javax.swing.JButton;
import java.awt.SystemColor;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JTextField;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.JComboBox;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class BorrowABook extends JFrame {
private JPanel contentPane;
private JTable table;
private JButton button;
private JLabel lblBookId;
private JTextField textFieldBookID;
private JLabel lblMemberId;
private JTextField textFieldMemberID;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
BorrowABook frame = new BorrowABook();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public BorrowABook() {
setTitle("Library system");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 971, 594);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
String data [][]=null;
String column []=null;
DefaultTableModel model = new DefaultTableModel();
try {
//code to receive data from the database
Connection con=DB.login();
PreparedStatement ps=con.prepareStatement("select * from book",ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
ResultSet rs=ps.executeQuery();
ResultSetMetaData rsmd=rs.getMetaData();
int cols=rsmd.getColumnCount();
column=new String[cols];
for(int i=1;i<=cols;i++){
column[i-1]=rsmd.getColumnName(i);
}
rs.last();
int rows=rs.getRow();
rs.beforeFirst();
data=new String[rows][cols];
int count=0;
while(rs.next()){
for(int i=1;i<=cols;i++){
data[count][i-1]=rs.getString(i);
}
count++;
}
con.close();
}catch (Exception e){
System.out.println(e);
}
contentPane.setLayout(null);
table = new JTable(data,column);
JScrollPane sp = new JScrollPane(table);
sp.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
int selectedRowIndex = table.getSelectedRow();
textFieldBookID.setText(model.getValueAt(selectedRowIndex, 0).toString());
textFieldMemberID.setText(model.getValueAt(selectedRowIndex, 1).toString());
}
});
sp.setBounds(5, 5, 936, 402);
contentPane.add(sp);
button = new JButton("Back");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
UserSection.main(new String [] {});
dispose();
}
});
button.setForeground(Color.BLACK);
button.setBackground(SystemColor.info);
button.setBounds(856, 509, 85, 25);
contentPane.add(button);
lblBookId = new JLabel("Book ID:");
lblBookId.setHorizontalAlignment(SwingConstants.RIGHT);
lblBookId.setFont(new Font("Sitka Display", Font.BOLD, 22));
lblBookId.setBounds(28, 420, 141, 29);
contentPane.add(lblBookId);
textFieldBookID = new JTextField();
textFieldBookID.setColumns(10);
textFieldBookID.setBounds(181, 420, 257, 29);
contentPane.add(textFieldBookID);
lblMemberId = new JLabel("Memeber ID:");
lblMemberId.setHorizontalAlignment(SwingConstants.RIGHT);
lblMemberId.setFont(new Font("Sitka Display", Font.BOLD, 22));
lblMemberId.setBounds(28, 469, 141, 29);
contentPane.add(lblMemberId);
textFieldMemberID = new JTextField();
textFieldMemberID.setColumns(10);
textFieldMemberID.setBounds(181, 469, 257, 29);
contentPane.add(textFieldMemberID);
}
}

Suggestions:
Add your MouseListener to your JTable, not to the JScrollPane. You need notification for when the table has been clicked.
You're using the wrong model in your listener as you never fill the DefaultTableModel with data. Be safe and get the model in the listener via table.getModel()
No null layouts. While this is not causing your current problem, it forces you to code against the library rather than with it.
For example (database code removed for simplicity, null layout removed as well, and posted a MCVE):
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.border.EmptyBorder;
import javax.swing.table.DefaultTableModel;
public class BorrowABook extends JFrame {
private JPanel contentPane;
private JTable table;
private JButton button;
private JLabel lblBookId;
private JTextField textFieldBookID;
private JLabel lblMemberId;
private JTextField textFieldMemberID;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
BorrowABook frame = new BorrowABook();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public BorrowABook() {
setTitle("Library system");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 971, 594);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
String data[][] = {{"1", "2", "3"}, {"4", "5", "6"}, {"7", "8", "9"}};
String column[] = {"One", "Two", "Three" };
DefaultTableModel model = new DefaultTableModel();
// !! contentPane.setLayout(null);
contentPane.setLayout(new BorderLayout());
table = new JTable(data, column);
JScrollPane sp = new JScrollPane(table);
table.addMouseListener(new MouseAdapter() {
#Override
public void mousePressed(MouseEvent e) {
int selectedRowIndex = table.getSelectedRow();
textFieldBookID.setText(table.getModel().getValueAt(selectedRowIndex, 0).toString());
textFieldMemberID.setText(table.getModel().getValueAt(selectedRowIndex, 1).toString());
}
});
//!! sp.setBounds(5, 5, 936, 402);
contentPane.add(sp);
JPanel bottomPanel = new JPanel();
lblBookId = new JLabel("Book ID:");
lblBookId.setHorizontalAlignment(SwingConstants.RIGHT);
lblBookId.setFont(new Font("Sitka Display", Font.BOLD, 22));
bottomPanel.add(lblBookId);
textFieldBookID = new JTextField();
textFieldBookID.setColumns(10);
textFieldBookID.setBounds(181, 420, 257, 29);
bottomPanel.add(textFieldBookID);
lblMemberId = new JLabel("Memeber ID:");
lblMemberId.setHorizontalAlignment(SwingConstants.RIGHT);
lblMemberId.setFont(new Font("Sitka Display", Font.BOLD, 22));
lblMemberId.setBounds(28, 469, 141, 29);
bottomPanel.add(lblMemberId);
textFieldMemberID = new JTextField();
textFieldMemberID.setColumns(10);
textFieldMemberID.setBounds(181, 469, 257, 29);
bottomPanel.add(textFieldMemberID);
contentPane.add(bottomPanel, BorderLayout.PAGE_END);
}
}

How to Show text retrieved from database on JButton, JTextArea in Java?

I am trying to build a quiz app and I managed to build the database. I created a GUI using the card layout to switch between panels and I tried to retrieve the questions and options from from the database to a JtextArea with no success. My question is how do I get the visual components (jtext area,jbutton to display the content from the database) I want them to automatically set the text according with the question number.
this is my code
package quizzGUI;
import java.awt.EventQueue;
import javax.swing.JFrame;
import java.awt.CardLayout;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import java.awt.Font;
import java.awt.List;
import javax.swing.SwingConstants;
import javax.swing.JButton;
import java.awt.Color;
import javax.swing.JRadioButton;
import javax.swing.JTextPane;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.awt.event.ActionEvent;
import javax.management.Query;
import javax.swing.ButtonGroup;
public class quizzMain {
private JFrame frame;
private JPanel Menu;
private JPanel Playing;
private JPanel Score;
private final ButtonGroup buttonGroup = new ButtonGroup();
public JTextPane textPane;
public JButton btnA;
public JRadioButton rdbtnB;
public JRadioButton rdbtnC;
public JRadioButton rdbtnD;
public JTextArea textArea;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
quizzMain window = new quizzMain();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
Connection connection = null;
public quizzMain() {
initialize();
connection = sqlConnection.dbConnector();
}
private void initialize() {
Connection connection = sqlConnection.dbConnector();
Statement stmt=null;
frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(new CardLayout(0, 0));
final JPanel Menu = new JPanel();
frame.getContentPane().add(Menu, "name_668313932787145");
Menu.setLayout(null);
Menu.setVisible(true);
final JPanel Playing = new JPanel();
Playing.setBackground(Color.CYAN);
frame.getContentPane().add(Playing, "name_668321772390383");
Playing.setLayout(null);
Playing.setVisible(false);
final JPanel Score = new JPanel();
frame.getContentPane().add(Score, "name_668324579994343");
Score.setLayout(null);
Score.setVisible(false);
JLabel lblNewLabel = new JLabel("C QUIZZ");
lblNewLabel.setFont(new Font("Times New Roman", Font.BOLD | Font.ITALIC, 14));
lblNewLabel.setHorizontalAlignment(SwingConstants.CENTER);
lblNewLabel.setBounds(123, 47, 169, 40);
Menu.add(lblNewLabel);
JButton btnStart = new JButton("Start");
btnStart.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
Integer i=0;
Playing.setVisible(true);
Menu.setVisible(false);
try{
String query = ("SELECT * FROM Question ");
PreparedStatement pst=connection.prepareStatement(query);
ResultSet rs=pst.executeQuery();
do {
btnA.setText(rs.getString("ANSWERA"));
}while(rs.next());
}catch(Exception e ){
JOptionPane.showMessageDialog(null, e);
e.printStackTrace();
}
}
});
btnStart.setFont(new Font("Tahoma", Font.BOLD, 12));
btnStart.setBounds(167, 176, 89, 23);
Menu.add(btnStart);
JButton btnFinish = new JButton("Finish");
btnFinish.setBounds(335, 227, 89, 23);
Playing.add(btnFinish);
btnFinish.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
Score.setVisible(true);
Playing.setVisible(false);
}
});
JButton btnNextQuestion = new JButton("Next");
btnNextQuestion.setBounds(10, 227, 89, 23);
Playing.add(btnNextQuestion);
JTextArea textArea = new JTextArea();
textArea.setBounds(20, 11, 387, 41);
Playing.add(textArea);
JButton btnA = new JButton("New button");
btnA.setBounds(20, 84, 381, 41);
Playing.add(btnA);
JTextArea txtrScore = new JTextArea();
txtrScore.setBounds(87, 74, 244, 43);
txtrScore.setText("Score:");
Score.add(txtrScore);
}
}

Since you didn't mention your code, its difficult to give you a short precise example. I would recommend you to go through this tutorial which retrieves information (name and number) and display it in JTextArea.
Extracting the key points from the tutorial below:
Database connection establishment and fetching information
String url = "jdbc:mysql://localhost:3306/";
String db = "databasename";
String driver = "com.mysql.jdbc.Driver";
String user = "xxxx";
String pass = "xxxx";
Connection con = null;
PreparedStatement pstatement = null;
Class.forName(driver).newInstance();
con = DriverManager.getConnection(url + db , user, pass);
pstatement = con.prepareStatement("SELECT name, phonenumber FROM tablename");
con = DriverManager.getConnection(url + db, user, pass);
ResultSet rs = pstatement.executeQuery();
while(rs.next()){
String name = rs.getString(1);
int phonenumber = rs.getInt(2);
}
Set text in JTextArea
Then use setText method of JTextArea to set the text. For example, recordTextArea.setText(name + " " + phonenumber);.