Double Buffering

The DigitalClock doesn’t flicker, but this illustrates the technique on a short example.

implements Runnable

{ . . .

Image offscreenImg;

Graphics og;

public void init ( )

{ offscreenImg = createImage (getSize( ).width, getSize( ).height);

og = offscreenImg.getGraphics ( );

}

public void paint ( Graphics g )

{ og.setFont ( theFont );

og.drawString ( theDate.toString ( ), 10, 50 );

g.drawImage ( offscreenImg, 0, 0, this);

}

public void update ( Graphics g)

{ paint ( g); }

}

The DigitalClock doesn’t flicker, but this illustrates the technique on a short example.