Drawing with double buffering to a JFrame

Question

I want to create a simple JFrame and draw stuff to it via Graphic object using double buffering.
If I create a loop and draw constantly using JFrame.getGraphic().xxx, am i doing double buffering. ( 'cause i read somewhere that swing components automaticly use double buffering ). And is this the righ approuch ( or whatever it's spelled ) ?

Answer 1

I want to create a simple JFrame and draw stuff to it
Don't do that.
If you want to do custom rendering then use JPanel or JComponent, not JFrame.
If I create a loop and draw constantly using JFrame.getGraphic().xxx, am i doing double buffering.
No.
You're also painting outside the standard paint cycle, which is a Bad Idea.
So, essentially, everything your suggesting is the wrong way to go about things.
In its most simple form, double buffering works something like this, though there are a whole load of subtleties to consider (such as component resizing for a start)
public class Foo extends JComponent
    private BufferedImage image = null;
    protected void paintComponent(Graphics g)
        if (image != null)
            image = createImage(getWidth(), getHeight());
            paintBuffer(ig);
        g.drawImage(image, 0, 0, this);
    private void paintBuffer()
        Graphics ig = image.getGraphics();
        // do the rendering
        ig.dispose();
}