How do I break my codes into classes??

Question

How do i break each tab into a class and call them inside a main program ??
Please show me how thanks.
import javax.swing.JTabbedPane;
import javax.swing.ImageIcon;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.BorderFactory;
import java.awt.*;
import java.awt.event.*;
import java.awt.print.*;
import java.sql.*;
import java.io.*;
public class DatabaseApp extends JPanel {
     // declare the width and height of UI
     public static int WIDTH = 800;
     public static int HEIGHT = 600;
     // create textfield objects for user to enter the input
     TextField employeeID = new TextField(15);
     TextField name = new TextField(40);
     TextField address = new TextField(40);
     TextField suburb = new TextField(20);
     TextField state = new TextField(5);
     TextField pCode = new TextField(5);
     TextField dob = new TextField(15);
     TextField homePh = new TextField(15);
     TextField workPh = new TextField(15);
     TextField mobile = new TextField("0",15);
     TextField eMail = new TextField(30);
     TextField dbase = new TextField("employee",20);
     TextField report = new TextField(15);
     TextField query= new TextField(50);
     TextArea displayArea = new TextArea(16,80);
     TextArea helpArea = new TextArea(20,80);
     public static void main (String[] args) {
          JFrame frame = new JFrame ("S-League Management System");
          frame.addWindowListener(new WindowAdapter(){
                    public void windowClosing (WindowEvent e) {
                         System.exit(0);
          frame.getContentPane().add(new DatabaseApp(), BorderLayout.CENTER);
          frame.setSize(800,600);
          frame.setResizable(false);
          frame.setVisible(true);
          //centralise the screen
          Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
          Dimension frameSize = frame.getSize();
          frame.setLocation((screenSize.width - frameSize.width) / 2,
               (screenSize.height - frameSize.height) / 2);
     /** add buttons to the database form
     public JButton(String text,Icon icon)
     Creates a button with initial text and an icon.
     Parameters:
     text - the text of the button.
     icon - the Icon image to display on the button
     JButton newButton = new JButton (" New ", new ImageIcon(DatabaseApp.class.getResource("img/New.gif")));
     JButton addButton = new JButton (" Add ", new ImageIcon (DatabaseApp.class.getResource("img/Add.gif")));
     JButton findButton = new JButton (" Retrieve ", new ImageIcon (DatabaseApp.class.getResource("img/Find.gif")));
     JButton updateButton = new JButton (" Update ", new ImageIcon (DatabaseApp.class.getResource("img/Refresh.gif")));
     JButton deleteButton = new JButton (" Delete ", new ImageIcon (DatabaseApp.class.getResource("img/Delete.gif")));
     JButton submitButton = new JButton (" Submit Query ", new ImageIcon (DatabaseApp.class.getResource("img/Export.gif")));
     JButton reportButton = new JButton (" Report File ", new ImageIcon (DatabaseApp.class.getResource("img/AlignLeft.gif")));
     /** create tabbed pane for form
     * public void addTab(String title,Icon icon,Component component,String tip)
     * Parameters:
     * title - the title to be displayed in this tab
     * icon - the icon to be displayed in this tab
     * component - The component to be displayed when this tab is clicked.
     * tip - the tooltip to be displayed for this tab
     public DatabaseApp() {
          // create new tabbedPane object
          JTabbedPane tabbedPane = new JTabbedPane(){
               ImageIcon imageIcon = new ImageIcon("img/logo.jpg");
               Image image = imageIcon.getImage();
               public void paintComponent (Graphics g) {
                    g.setColor(new Color(220,220,220));
                    g.fillRect(0,0,643,74);
                    g.drawImage(image, 0, 4, this);
                    super.paintComponent(g);
          tabbedPane.addTab(" Team Management ",null, buildQueryPanel(), "Team Management");
          tabbedPane.addTab(" Player Registration ",null, buildGeneralPanel(), "Player Registration");
          tabbedPane.addTab(" Author ",null, buildAuthorPanel(), "Author");
          // assign layout manager
          //setLayout(new GridLayout(1,1));
          tabbedPane.setSelectedIndex(1);
          tabbedPane.setBorder(BorderFactory.createEmptyBorder(78,0,0,0));
          add(tabbedPane);
     protected JPanel buildQueryPanel() {
          JPanel mainPane = new JPanel();
          // divided into three panes. these panes will be added to mainPanel
          JPanel westPane = new JPanel();
          JPanel centrePane = new JPanel();
          JPanel southPane = new JPanel();
          // assign the layout managers
          mainPane.setLayout(new BorderLayout());
          westPane.setLayout(new GridLayout(4,1));
          centrePane.setLayout(new GridLayout(4,1));
          // create array of Panels for label textfield and buttons and make them left align
          Panel labelPane[] = new Panel[4];
          Panel buttontxtPane[] = new Panel[4];
          Panel textPane[] = new Panel[1];
          for (int i=0; i < labelPane.length; ++i) {
               labelPane[i] = new Panel();
               labelPane.setLayout(new FlowLayout(FlowLayout.LEFT));
          for (int i=0; i < buttontxtPane.length; ++i) {
               buttontxtPane[i] = new Panel();
               buttontxtPane[i].setLayout(new FlowLayout(FlowLayout.LEFT));
          for (int i=0; i < textPane.length; ++i) {
               textPane[i] = new Panel();
               textPane[i].setLayout(new FlowLayout(FlowLayout.LEFT));
          // add different label to the labelPane
          labelPane[0].add(new JLabel("Database:"));
          labelPane[1].add(new JLabel("Query:"));
          labelPane[2].add(new JLabel("Report File:"));
          labelPane[3].add(new Label(""));
          // textfields
          buttontxtPane[0].add(dbase);
          buttontxtPane[1].add(query);
          buttontxtPane[2].add(report);
          // buttons
          buttontxtPane[3].add(submitButton);
          submitButton.setMnemonic('s');
          buttontxtPane[3].add(reportButton);
          reportButton.setMnemonic('r');
          // text area to view the result
          textPane[0].add(displayArea);
          // add action listener to buttons
          submitButton.addActionListener(new ButtonHandler());
          reportButton.addActionListener(new ButtonHandler());
          for(int i=0; i < labelPane.length; ++i)
               westPane.add(labelPane[i]);
          for(int i=0; i < buttontxtPane.length; ++i)
               centrePane.add(buttontxtPane[i]);
          for(int i=0; i < textPane.length; ++i)
               southPane.add(textPane[i]);
          mainPane.add(westPane, BorderLayout.WEST);
          mainPane.add(centrePane, BorderLayout.CENTER);
          mainPane.add(southPane,BorderLayout.SOUTH);
          return mainPane;
     /**Create a JPanel for General tab, divide it into three JPanels for label, displaytext
     * and buttons.Assign a Flowlayout manager to each panel. Add label, textfield
     * and buttons to respective panel. following constructors will be used
     * for Jlabel
     * public JLabel(String text)
     * Creates a JLabel instance with the specified text. The label is aligned against the leading edge of its display area, and centered vertically.
     * Parameters:
     * text - The text to be displayed by the label.
     protected Component buildGeneralPanel() {
          // main panel
          JPanel mainPanel = new JPanel();
          // divided into three panes. these panes will be added to mainPanel
          JPanel westPane = new JPanel();
          JPanel centrePane = new JPanel();
          JPanel southPane = new JPanel();
          // assign the layout managers
          mainPanel.setLayout(new BorderLayout());
          westPane.setLayout(new GridLayout(12,1));
          centrePane.setLayout(new GridLayout(12,1));
          // create array of Panels for label textfield and buttons and make them left align
          Panel labelPane[] = new Panel[12];
          Panel textPane[] = new Panel[12];
          Panel buttonPane[] = new Panel[2];
          for (int i=0; i < labelPane.length; ++i) {
               labelPane[i] = new Panel();
               labelPane[i].setLayout(new FlowLayout(FlowLayout.LEFT));
          for (int i=0; i < textPane.length; ++i) {
               textPane[i] = new Panel();
               textPane[i].setLayout(new FlowLayout(FlowLayout.LEFT));
          for (int i=0; i < buttonPane.length; ++i) {
               buttonPane[i] = new Panel();
               buttonPane[i].setLayout(new FlowLayout(FlowLayout.LEFT));
          // add different label to the labelPane
          labelPane[0].add(new JLabel("Employee No"));
          labelPane[1].add(new JLabel("Name"));
          labelPane[2].add(new JLabel("Address"));
          labelPane[3].add(new JLabel("Suburb"));
          labelPane[4].add(new JLabel("State"));
          labelPane[5].add(new JLabel("PostCode"));
          labelPane[6].add(new JLabel("Date of Birth"));
          labelPane[7].add(new JLabel("Home Phone"));
          labelPane[8].add(new JLabel("Work Phone"));
          labelPane[9].add(new JLabel("Mobile"));
          labelPane[10].add(new JLabel("E-mail"));
          // add textfield component to textPane
          textPane[0].add(employeeID);
          textPane[1].add(name);
          textPane[2].add(address);
          textPane[3].add(suburb);
          textPane[4].add(state);
          textPane[5].add(pCode);
          textPane[6].add(dob);
          textPane[7].add(homePh);
          textPane[8].add(workPh);
          textPane[9].add(mobile);
          textPane[10].add(eMail);
          // add button to buttonPane and assign keyboard key for shortcut e.g Alt + n
          buttonPane[0].add(newButton);
          newButton.setMnemonic('n');
          buttonPane[0].add(addButton);
          addButton.setMnemonic('a');
          buttonPane[0].add(findButton);
          findButton.setMnemonic('r');
          buttonPane[0].add(updateButton);
          updateButton.setMnemonic('u');
          buttonPane[0].add(deleteButton);
          deleteButton.setMnemonic('d');
          // add actionlistener to the buttons
          newButton.addActionListener(new ButtonHandler());
          addButton.addActionListener(new ButtonHandler());
          findButton.addActionListener(new ButtonHandler());
          updateButton.addActionListener(new ButtonHandler());
          deleteButton.addActionListener(new ButtonHandler());
          for (int i = 0; i < labelPane.length; ++i)
               westPane.add(labelPane[i]);
          for (int i = 0; i < textPane.length; ++i)
               centrePane.add(textPane[i]);
          for (int i = 0; i < buttonPane.length; ++i)
               southPane.add(buttonPane[i]);
          mainPanel.add(westPane,BorderLayout.WEST);
          mainPanel.add(centrePane,BorderLayout.CENTER);
          mainPanel.add(southPane,BorderLayout.SOUTH);
          return mainPanel;
     protected JPanel buildAuthorPanel(){
          JPanel authorPanel = new JPanel();
          JPanel authorPane = new JPanel();
          authorPanel.setLayout(new BorderLayout());
          authorPane.setLayout(new GridLayout(9,1));
          Panel pane[] = new Panel[9];
          for (int i=0; i < pane.length; i++) {
               pane[i] = new Panel();
               pane[i].setLayout(new FlowLayout(FlowLayout.CENTER));
          pane[0].add(new JLabel(""));
          pane[1].add(new JLabel(""));
          pane[2].add(new JLabel(""));
          pane[3].add(new JLabel(""));
          pane[4].add(new JLabel("Name:Jasper Lim Jiqiang"));
          pane[5].add(new JLabel("Admin:992365G"));
          pane[6].add(new JLabel(""));
          pane[7].add(new JLabel(""));
          pane[8].add(new JLabel(""));
          for (int i=0; i < pane.length; i++)
               authorPane.add(pane[i]);
          authorPanel.add(authorPane, BorderLayout.CENTER);
          return authorPanel;

Answer 1

Maybe something like this:
<code>
JTabbedPane tabbedPane = new JTabbedPane();
          JPanel introPanel = new JPanel();
          introPanel.add(createIntroPanel());
          ImageIcon img = new ImageIcon(getResourceString("tabIconFile"));
          tabbedPane.addTab(getResourceString("introTab"), img, introPanel);
</code>
plus
<code>
protected JPanel createIntroPanel()
          JPanel pane = new IntroPanel();
          return pane;
</code>
Klint