Delay loading images when switching to different screen...

Question

Hi,
I got it all to work but there's a ridiculous delay loading images for the next screen. There's only one window, but many different screens represent different states of the program.
1st screen)This screen using JPanel to display the screen. In this screen, I overrided
the paintComponent to draw background image. The button is triggered
by mouseclick event which then tell the next screen to load.
2nd screen)This screen uses Graphics2D (bufferedImage in the Engine is already
created)to draw image onto the screen.
1st Screen code below:
public class LoginController extends JFrame implements Controller, ImageObserver{
     private GameEngine myEngine;
     private SpeechEngine ttsEngine;     
        private Image login;
     private JPanel main;
     private JTextField nameField;
     private JPasswordField passwordField;
     private class Background extends JPanel implements MouseListener
         private Image login;
         public Background(){
            super();   
            setOpaque(false);
            login = new ImageIcon("gfx/slogin.PNG").getImage();            
         public void paintComponent(Graphics g){
              Graphics2D g2 = (Graphics2D) g.create();
            g2.drawImage(login, 0, 0, this);
            g2.dispose();
          public void addComponent(Container container, Component c, int x,
                                                      int y, int width, int height) {
               c.setBounds(x,y,width,height);
                  container.add(c);             
          /* (non-Javadoc)
           * @see java.awt.event.MouseListener#mouseClicked(java.awt.event.MouseEvent)
          public void mouseClicked(MouseEvent event) {
               int X = event.getX();
               int Y = event.getY();
               if (event.getButton() == MouseEvent.BUTTON1 ) {
                    if ( X >= buttonLoginX && X <= (buttonLoginX+buttonWidth)) {
                         if ( Y >= buttonY && Y <= (buttonY+buttonHeight)) {                    
                              //will add aucthentication
                              switchView();
                              myEngine.startMenu();                              
               if (event.getButton() == MouseEvent.BUTTON1 ) {
                    if (X >= buttonQuitX && X <= (buttonQuitX+buttonWidth)) {
                         if ( Y >= buttonY && Y <= (buttonY+buttonHeight) ) {
                              System.exit(0);
    } // end Background
      * contructor
      * @param args
     public LoginController() {
          super();
          myEngine = new GameEngine(this, new Student());
          ttsEngine = new SpeechEngine();
          login = new ImageIcon("gfx/slogin.PNG").getImage();
          nameField = new JTextField();
          nameField.setFont(new Font(null, Font.BOLD, 16));
        passwordField = new JPasswordField();
        passwordField.setFont(new Font(null, Font.BOLD, 16));
        startGame();
     public void switchView(){
          this.setContentPane(myEngine);          
     * preset the screen to current width and height
     public void startGame(){
          Background mainLogin = new Background();
          mainLogin.setLayout(null);
        mainLogin.addComponent(mainLogin,nameField,buttonQuitX+5,250,230,30);   
        mainLogin.addComponent(mainLogin,passwordField,buttonLoginX-140,250,230,30);
        //load JFrame          
          this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setContentPane(mainLogin);
        this.setSize(GameEngine.SCREEN_WIDTH, GameEngine.SCREEN_HEIGHT);       
        this.setVisible(true);    
        this.addMouseListener(mainLogin);
        this.validate(); 
        myEngine.init();
        new Thread(myEngine).start();
        new Thread(ttsEngine).start();
     public void gameStep(Graphics2D canvas){
          /*not requires anymore*/          
      * @param Images
     public boolean imageUpdate(Image img, int infoflags,int x,
                                        int y, int width, int height) {          
          return false;
     public void mouseClicked(MouseEvent event) {
          // TODO Auto-generated method stub          
          System.out.println();
      * Main
      * @param args
    public static void main(String[] args) {
         LoginController newGame = new LoginController();       
}// end LoginController ----------------------------- 2nd screen code ------------------------------------------
public class PreLessonController implements Controller, ImageObserver {
     private Session curSession;
     private GameEngine curEngine;
     private Image preLesson;
     private boolean initialized;
     public PreLessonController(GameEngine engine, Session s) {
          curEngine = engine;
          curSession = s;
          initialized = false;
          preLesson = new ImageIcon("gfx/preless.PNG").getImage();
     /* (non-Javadoc)
      * @see game.Controller#gameStep(java.awt.Graphics2D)
     public void gameStep(Graphics2D canvas) {  
                           // the image execute but nevers get to the screen with the code below
                           // until I resize the window screen.
          if ( !initialized )
               canvas.clearRect(0, 0, GameEngine.SCREEN_WIDTH,GameEngine.SCREEN_HEIGHT);          
          canvas.setTransform(AffineTransform.getTranslateInstance(0, 0));
        // prepare for the prelesson screen
          canvas.clearRect(0, 0, GameEngine.SCREEN_WIDTH, GameEngine.SCREEN_HEIGHT + 20);          
          canvas.drawImage(preLesson, 0, 0, this);
          //drawing rectangular for button
          Font tmp = canvas.getFont();
          canvas.setFont(new Font(null, Font.BOLD, 24));          
          canvas.setPaint(Color.RED);
          canvas.drawRect(455, 410, 170, 40);
          canvas.drawString("START GAME", 460, 440);
          canvas.setFont(tmp);
     /* (non-Javadoc)
      * @see game.Controller#mouseClicked(java.awt.event.MouseEvent)
     public void mouseClicked(MouseEvent event) {
          // TODO Auto-generated method stub
          if (event.getButton() == MouseEvent.BUTTON1 && event.getX() >= 455
                    && event.getX() <= 625 && event.getY() >= 410
                    && event.getY() <= 450) {
               curEngine.startGame();
} //end prelessonController  I have been working on it for 2 hrs and can't figure out what is wrong. Like I stated above in the code, if I resize the current running window, the 2nd screen just pop up, else, I would wait for long time.
Please help. Very appreciated.

Answer 1

anyone?