I need help to go from fullscreen to window mode.

Question

I recently started programming very simple java games, when I get stuck I ask for help or find free code on the internet.
I'm currently using free code to run a JFrame in full screen exclusive mode.
I cannot figure out how to go from full screen exclusive mode back to regular window mode.
here is the code I'm using
   private final boolean initialiseFullScreen() {
        setUndecorated(true);
        setIgnoreRepaint(true);
        setResizable(false);
        graphicsDevice = GraphicsEnvironment.
                getLocalGraphicsEnvironment().getDefaultScreenDevice();
        // Check to see if FSEM is supported and if the target display mode is
        // available and if the desired buffer strategy can be created.
        if (graphicsDevice.isFullScreenSupported()) {
            graphicsDevice.setFullScreenWindow(this);
            if (setDisplayMode(screenWidth, screenHeight, screenColorDepth)) {
                if (setBufferStrategy()) {
                    return true;
        return false;
    private final boolean setDisplayMode(
            int screenWidth, int screenHeight, int screenColorDepth) {
        if (graphicsDevice.isDisplayChangeSupported() == false) {
            return false;
        boolean displayModeAvailable = false;
        DisplayMode[] displayModes = graphicsDevice.getDisplayModes();
        for (DisplayMode mode : displayModes) {
            if (screenWidth == mode.getWidth() && screenHeight == mode.getHeight()
                    && screenColorDepth == mode.getBitDepth()) {
                displayModeAvailable = true;
        if (displayModeAvailable == false) {
            return false;
        DisplayMode targetDisplayMode =
                new DisplayMode(screenWidth, screenHeight,
                    screenColorDepth, DisplayMode.REFRESH_RATE_UNKNOWN);
        try {
            graphicsDevice.setDisplayMode(targetDisplayMode);
        } catch (IllegalArgumentException exception) {
            return false;
        return true;
    private final boolean setBufferStrategy() {
        try {
            // If this process is not running from the event dispatch thread
            // (which is desirable) then make use of invoke and wait to avoid
            // a potential deadlock situation. This may be an unncessary
            // precaution in Java 1.6
            if (EventQueue.isDispatchThread() == false) {
                EventQueue.invokeAndWait(new Runnable() {
                    public void run() {
                        createBufferStrategy(FSEM_NUM_PAGE_BUFFERS);
            } else {
                createBufferStrategy(FSEM_NUM_PAGE_BUFFERS);
            // Sleep for a short interval to provide adequate time for the buffer
            // strategy to be created.
            Thread.sleep(500);
        } catch (Exception exception) {
            return false;
        // Store the created buffered strategy for use within the render cycle
        bufferStrategy = getBufferStrategy();
        return true;
    }

Answer 1

Create a new method that does the opposite initialiseFullScreen().
Start with:
setUndecorated(false);
setIgnoreRepaint(false);
setResizable(true);Then call methods on the graphicsDevice to return to windowed mode.
Look at what the methods used do:
[http://java.sun.com/j2se/1.4.2/docs/api/java/awt/GraphicsDevice.html#setFullScreenWindow(java.awt.Window)|http://java.sun.com/j2se/1.4.2/docs/api/java/awt/GraphicsDevice.html#setFullScreenWindow(java.awt.Window)]
According to the docs, setFullscreenWindow can enter fullscreen, but also leave fullscreen with:
setFullscreenWindow(null);