The Basic Recipe for Rendering in Java 2D

A fundamental three-step recipe exists for programming graphics in Java. Get (or modify) the Graphics2D context, create some geometry (or an image), and call a rendering method. The following short code snippet demonstrates this recipe:

public void paint(Graphics g) {

//get instance of graphics context
Graphics2D g2d  = (Graphics2D) g;

//modify the graphics context
g2d.setColor(Color.blue);

//call a render method
g2d.fill(new Ellipse2D.Float(5.f,5.f, 40.f, 40.f,);

}

Several complete examples are developed in Chapter 3, “Graphics Programming with the Java 2D API.”