Problem to draw rectangle in Card LayOut.

Question

This is my code..i can't display the rectangle in card lay out...pls help me!
JPanel cards;
final static String WELCOME = "Welcome Screen";
public void addComponentToPane(Container pane) {
JPanel comboBoxPane = new JPanel();
     comboBoxPane.setSize(500,500);
String comboBoxItems[] = { WELCOME};
JComboBox cb = new JComboBox(comboBoxItems);
cb.setEditable(false);
cb.addItemListener(this);
comboBoxPane.add(cb);
//inside this is the paintComponent() method..
     AirAsiaFirstClass first = new AirAsiaFirstClass();
JPanel card1 = new JPanel();
     JLabel label = new JLabel("WELCOME TO AIR ASIA.");
     card1.add(label);
card1.add(first);
     card1.setSize(500,500);
card1.setVisible(true);
cards = new JPanel(new CardLayout());
cards.add(card1, WELCOME);
pane.add(comboBoxPane, BorderLayout.PAGE_START);
pane.add(cards, BorderLayout.CENTER);
public void itemStateChanged(ItemEvent evt) {
CardLayout cl = (CardLayout)(cards.getLayout());
cl.show(cards, (String)evt.getItem());
private static void createAndShowGUI() {
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame("Air Asia");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     frame.setSize(500,500);
CardLayoutDemo demo = new CardLayoutDemo();
demo.addComponentToPane(frame.getContentPane());
frame.setVisible(true);
}

Answer 1

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CLD implements ItemListener {
    JPanel cards;
    final static String WELCOME = "Welcome Screen";
    public void addComponentToPane(Container pane) {
        JPanel comboBoxPane = new JPanel();
//        comboBoxPane.setSize(500,500);
        String comboBoxItems[] = { WELCOME };
        JComboBox cb = new JComboBox(comboBoxItems);
        cb.setEditable(false);
        cb.addItemListener(this);
        comboBoxPane.add(cb);
        //inside this is the paintComponent() method..
        AAFC first = new AAFC();
        JPanel card1 = new JPanel();  // default FlowLayout
        JLabel label = new JLabel("WELCOME TO AIR ASIA.");
        card1.add(label);
        card1.add(first);
        // these next two lines have no affect
        // JPanel responds to "setPreferredSize" better than "setSize"
        // "setSize" works better for top-level containers like JFrame
//        card1.setSize(500,500);
//        card1.setVisible(true);
        cards = new JPanel(new CardLayout());
        cards.add(card1, WELCOME);
        pane.add(comboBoxPane, BorderLayout.PAGE_START);
        pane.add(cards, BorderLayout.CENTER);
    public void itemStateChanged(ItemEvent evt) {
        CardLayout cl = (CardLayout)(cards.getLayout());
        cl.show(cards, (String)evt.getItem());
    private static void createAndShowGUI() {
        JFrame.setDefaultLookAndFeelDecorated(true);
        JFrame frame = new JFrame("Air Asia");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(500,500);
        CLD demo = new CLD();
        demo.addComponentToPane(frame.getContentPane());
        frame.setVisible(true);
    public static void main(String[] args) {
        createAndShowGUI();
class AAFC extends JPanel {
    int width = 150;
    int height = 55;
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        int w = getWidth();
        int h = getHeight();
        g2.setPaint(Color.red);
        g2.drawRect(10, 10, w-20, h-20);
     * tells parent container what size this needs for display
     * without this and with no child components this JPanel
     * will report a size of either 0,0 or the default 10,10 to
     * its parent container.
    public Dimension getPreferredSize() {
        return new Dimension(width, height);
}