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    <p>Reviewed your code,I suggest you to give every class a good name. </p> <p>Bad-style naming ,such as Frame extends Canvas ,will make a mess.</p> <p>And If you use Swing,there built-in buffered-Strategy for you,like double-buffered strategy. </p> <p>please give more information.</p> <p>currently,I refactored your code ,and make a sample as follow:</p> <pre><code>import java.awt.*; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.image.BufferStrategy; import javax.swing.JFrame; import javax.swing.SwingUtilities; /** * this code still Need to improve * deal with Thread related code * */ public class Game extends Canvas implements Runnable{ public static void main(String[] args) { //GUI EDT thread SwingUtilities.invokeLater(new Runnable(){ @Override public void run() { JFrame frame = new JFrame("Finland2D"); frame.setPreferredSize(new Dimension(765, 500)); final Game game = new Game(); game.playing = true; frame.add(game); frame.pack(); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); frame.addWindowListener(new WindowAdapter(){ @Override public void windowClosing(WindowEvent e) { // TODO Auto-generated method stub game.finish(); System.exit(0); } }); //start game thread new Thread(game).start(); } }); } public Game() { } @Override public void run() { while (playing) { update(); render(); } } public void finish() { playing = false; } public void update() { } public void render() { BufferStrategy b = null; if (super.getBufferStrategy() == null) { super.createBufferStrategy(3); } b = super.getBufferStrategy(); Graphics2D g = (Graphics2D) b.getDrawGraphics(); g.setColor(Color.BLACK); g.fillRect(0, 0, getWidth(), getHeight()); g.dispose(); b.show(); } private static final long serialVersionUID = 1L; public boolean playing = false; } </code></pre>
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    1. COwhy you get IllegalStateException: Component must have a valid peer,mostly you haven't add the canvas to the frame.And you can choose to use JPanel instead of Canvas.
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