private void createFrame() { frame = new JFrame(title); frame.setSize(dimension); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLocationRelativeTo(null); frame.setResizable(false); frame.setFocusable(true); frame.setVisible(true); canvas = new Canvas(); canvas.setPreferredSize(dimension); canvas.setMaximumSize(dimension); canvas.setMinimumSize(dimension); canvas.setFocusable(false); frame.add(canvas); frame.pack(); }