Swing : animation still stutter when I use Toolkit.getDefaultToolkit().sync();

I'm trying to draw Image every 100ms time by using Thread.sleep(). But I heard that when using Thread.sleep() with swing, It moves like stutter. so I add code Toolkit.getDefaultToolkit().sync(), but it still looks like stuttering.

Correctly speaking, it looks like delay like 2~300ms and draw at once with short time.

I mean when I want to move Image, I wish to look like

draw - sleep - draw - sleep - ...

but it looks like

draw - sleep - sleep - sleep - draw - draw - draw - sleep - ...

I'm sorry that poor of my explanation, I wish you can understand this.

And here is my code.

public abstract class EngineViewer implements Runnable

private int _frameInterval = 100;
private CameraInterface _camera;

private Canvas _canvas;

public EngineViewer(int displayWidth, int displayHeight, int resolutionWidth, int resolutionHeight)

Thread thread = new Thread(this);
thread.start();


private void Sleep()

try Thread.sleep(_frameInterval);
catch(Exception e)



@Override
public void run()

while(true)

Clear();

_camera.Draw(_canvas);

Draw();

Sleep();



protected abstract void Draw();



Register camera to EngineViewer, EngineViewer call Camera.Draw() every time.
Camera draw Image to buffer which is get from SwingViewer._buffer.

And draw _buffer to _panel at Draw Method, after that call Toolkit.getDefaultToolkit().sync().

public class SwingViewer extends EngineViewer

private JFrame _frame;

private SWPanel _panel;

private BufferedImage _buffer;
private Graphics2D _graphic;

public SwingViewer(String name, int displayWidth, int displayHeight, int resolutionWidth, int resolutionHeight)

super(displayWidth, displayHeight, resolutionWidth, resolutionHeight);

_frame = new JFrame(name);
_frame.setSize(displayWidth, displayHeight);
_frame.setVisible(true);
_frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

_panel = new SWPanel();
_frame.add(_panel);


@Override
public void Draw()

if(_panel != null)
_panel.Draw();

Toolkit.getDefaultToolkit().sync();


private class SWPanel extends JPanel

private static final long serialVersionUID = 1;

private void Draw()

repaint();


@Override
public void paintComponent(Graphics g)

super.paintComponent(g);

g.drawImage(_buffer, 0, 0, EngineViewer.DisplayWidth(), EngineViewer.DisplayHeight(), null);





Canvas

JPanel

BufferStrategy

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