We are programming pinball and have a problem with the draw of the objects in canvas. How it works: We get frame_drawSizeX and frame_drawSizeY from our Config Menu, and draw the Frame with it's basic contents: the menu bar and a panel canvas in which we want to draw everything of the game itself. public void drawFrame(int frame_drawSizeX, int frame_drawSizeY) { System.out.println("Entering drawFrame();"); //Create new GUI //<editor-fold defaultstate="collapsed" desc=" Declaration and Definition of JFrame "> JFrame game = new JFrame(); game.setType(Window.Type.UTILITY); game.setResizable(false); game.setSize(frame_drawSizeX, frame_drawSizeY); game.setLocationRelativeTo(null); game.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); game.setVisible(true); //</editor-fold> //Creates a menubar for a JFrame JMenuBar menuBar = new JMenuBar(); //Add the menubar to the frame game.setJMenuBar(menuBar); //Define and add dropdown menus to the menubar JMenu returnToMenu = new JMenu("Return to Menu"); JMenu pointCounter = new JMenu("Your Points: 0"); JMenu liveCounter = new JMenu("Remaining Lives: 3"); JMenu levelCounter = new JMenu("Level: 0"); //Make them visible: menuBar.add(returnToMenu); menuBar.add(pointCounter); menuBar.add(liveCounter); menuBar.add(levelCounter); JPanel canvas = new JPanel(); game.add(canvas); canvas.add(draw); draw.repaint(); } Then we start with drawing the needed objects. //Creates the Object canvas drawObjects draw = new drawObjects(); If we run this program through, it launches without any problems but doesn't display any Objects which should be drawn by entering drawObjects() - Yes, it enters paintCompnent(). // Drawing objects class drawObjects extends JPanel { @[member='override2299'] protected void paintComponent(Graphics g) { System.out.println("Entering paintComponent();"); g.setColor(Color.BLACK); //g draws ball g.fillOval(ball_posX, ball_posY, ball_radius*2, ball_radius*2); //g draws paddle g.fillRect(paddle_posX, paddle_posY, paddle_width, paddle_height); } } But we want to draw it permanetly, so a while(true) must be programmed in drawFrame(): while(true) { canvas.add(draw); draw.repaint(); } However, since this while(true) is implemented, the program doesn't even draw anything if you start it! Instead of the normal UI with a Menu, it displays the Frameborder and a white background. Our question is how can we solve this problem? Here is the whole code: http://pastebin.com/izC536Td

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Java: Need help with while(true) in canvas of game

By _Art3mis_
March 11, 2014 in Programming

Go to solution Solved by fizzlesticks, March 11, 2014

run:Entering drawFrame();actionPerformed();actionPerformed();actionPerformed();actionPerformed();
I now edited the obj declarations to public so I can access them everywhere.

And I did what you said, here the newest Version so far: http://pastebin.com/yU7850tM

However, as you can see above, he doesn't access the paintComponent()...

You got rid of your draw object, you still need one of those. Change the definition of canvas to

JPanel canvas = new drawObjects();