Can't change Canvas's Maximum Size

Question

Hi, I am trying to make a program which has a frame which is fullscreen and a canvas which is the same size.
So far I have got this:
JFrame frame = new JFrame("Screensaver");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Toolkit tk = Toolkit.getDefaultToolkit(); 
screenWidth = ((int) tk.getScreenSize().getWidth()); 
screenHeight = ((int) tk.getScreenSize().getHeight()); 
frame.setSize(screenWidth, screenHeight); 
frame.setUndecorated(true);
frame.setResizable(false);
Canvas canvas = new Canvas();
Dimension screenSize = new Dimension(screenWidth, screenHeight);
canvas.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { System.exit(0); } });
frame.getContentPane().add(canvas, BorderLayout.CENTER);          
frame.setVisible(true);
canvas.setMaximumSize(screenSize);
canvas.setSize(screenSize);Note: At the beginning of the class is:
public int screenWidth.;
public int screenHeight;But the canvas still won't draw larger than the default maximumSize.
As soon as I change the maximumSize, and then look at it again, it's gone back to the default!
Anyone have any idea why?

Answer 1

Do you want a [full screen exlcusive|http://java.sun.com/docs/books/tutorial/extra/fullscreen/index.html] window or just a window that happens to be the size of the desktop (minus the area of the taskbar)?
But the canvas still won't draw larger than the default maximumSize.I'm not sure how to interpret this statement. You've set the maximum size to the the desktop. So are you saying you can't draw beyond the desktop? Are you using canvas.getGraphics() by any chance?
As soon as I change the maximumSize, and then look at it again, it's gone back to the default!The canvas is added to the content pane in the BorderLayout.CENTER region. And it's the only component in there. Hence, it will be the same size as the content pane (which is the same size as the frame) regardless of what size or preferred size you may set on it. This is to be expected though. BorderLayout is allowed to resize the center component to take up the extra space.