import java.awt.*;
import java.applet.*;
class NoFlickerApplet extends Applet {
    private Image     offScreenImage;
    private Graphics  offScreenGraphics;
    private Dimension offScreenSize;
    public final void update(Graphics theGraphicsContext){
	Dimension dim = this.getSize(); /* size() originally... */ 
	if( (offScreenImage == null) || 
	    (dim.width != offScreenSize.width) || 
	    (dim.height != offScreenSize.height)) {
	    this.offScreenImage = this.createImage(dim.width, dim.height);
	    this.offScreenSize = dim;
	    this.offScreenGraphics = this.offScreenImage.getGraphics(); 
	}
	this.offScreenGraphics.clearRect(0, 
					 0, 
					 this.offScreenSize.width, 
					 this.offScreenSize.height); 
	this.paint(offScreenGraphics);
	theGraphicsContext.drawImage(this.offScreenImage,
				     0,
				     0,
				     null);
    }
}